Patent Publication Number: US-11652198-B2

Title: Light-emitting device including wirings in groove structure

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2018-179258, filed on Sep. 25, 2018, and is a divisional of U.S. application Ser. No. 16/581,627, filed on Sep. 24, 2019, the disclosures of which are hereby incorporated by reference in their entirety. 
    
    
     BACKGROUND 
     The present disclosure relates to a light-emitting device manufacturing method and a light-emitting device. 
     Semiconductor light-emitting elements, typically light emitting diodes (LEDs), have been broadly used in backlight units of liquid crystal display devices or the like. For example, Japanese Patent Publication No. 2015-032373 describes a backlight unit which includes a plurality of light sources and an optical sheet. 
     The backlight unit described in Japanese Patent Publication No. 2015-032373 is a so-called direct-lit backlight unit in which light sources are two-dimensionally arrayed on a substrate at the rear side of a liquid crystal panel. As shown in FIG. 3 of Japanese Patent Publication No. 2015-032373, each of the light sources on the substrate includes a package with a cavity in which a LED chip is to be placed, a LED chip placed in the cavity of the package, and an encapsulant covering the LED chip. The package includes an external electrode in part thereof. By connecting the external electrode of the package to the substrate, for example, by soldering, the light sources can be mounted onto the substrate. 
     SUMMARY 
     However, there is a case where a large number of light sources are mounted to the substrate, particularly where the light sources are more densely mounted to the substrate. In such a case, formation of finer and more complicated wiring (e.g., circuit traces) is sometimes required in the substrate that supports the light sources. 
     A light-emitting device manufacturing method of an embodiment of the present disclosure includes: providing a light-emitting structure, the light-emitting structure having a first surface and a second surface opposite to the first surface, the light-emitting structure including one or more light-emitting elements and a covering member covering the one or more light-emitting elements, each of the one or more light-emitting elements having a first electrode and a second electrode each having a lower surface, a lower surface of the first electrode and a lower surface of the second electrode each being closer to the first surface than the second surface; removing part of the covering member, part of the first electrode and part of the second electrode by irradiation with laser light from a first surface side to form a groove structure on the first surface side of the light-emitting structure such that at least part of the first electrode and at least part of the second electrode are exposed to an inside of the groove structure; and filling the inside of the groove structure with an electrically-conductive material to form a plurality of wirings. 
     A light-emitting device manufacturing method of another embodiment of the present disclosure includes: providing a light-emitting structure, the light-emitting structure including one or more light-emitting elements and a covering member covering the one or more light-emitting elements, each of the one or more light-emitting elements including a first electrode and a second electrode, each of the first electrode and the second electrode having a lower surface; placing a mask having a sheet shape above the lower surface of the first electrode and the lower surface of the second electrode; irradiating with laser light to remove at least part of the mask such that at least part of the first electrode and at least part of the second electrode are exposed; and forming a plurality of wirings by filling a portion from which the mask is removed with an electrically-conductive material. 
     A light-emitting device of an embodiment of the present disclosure includes: a light-emitting module including one or more light-emitting elements and a package covering the one or more light-emitting elements, each of the one or more light-emitting elements having a first electrode and a second electrode, the light-emitting module having a groove structure on a lower surface side; and a first wiring and a second wiring which are partially or entirely present in the groove structure, wherein at least part of the first electrode and at least part of the second electrode are exposed to an inside of the groove structure, the first wiring is electrically connected with the first electrode, and the second wiring is electrically connected with the second electrode. 
     Certain embodiment of the present disclosure can provide a light-emitting device with which complication of wiring on the substrate side can be avoided, for example, after electrically connecting a plurality of light-emitting elements with one another, and a manufacturing method thereof. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic perspective view showing an example of the external appearance of a light-emitting device of the first embodiment of the present disclosure. 
         FIG.  2    is a schematic cross-sectional view of the light-emitting device  100 A shown in  FIG.  1    taken along a plane parallel to the Z-X plane of  FIG.  1    in the center of its vicinity of the light-emitting device  100 A. 
         FIG.  3    is a schematic bottom view of the light-emitting device  100 A shown in  FIG.  1    as viewed from the lower surface  100   b  side. 
         FIG.  4    is a schematic bottom view showing a resultant structure after a first wiring  310  and a second wiring  320  are removed from  FIG.  3   . 
         FIG.  5    is a schematic bottom view showing a light-emitting device of a first variation of the first embodiment. 
         FIG.  6    is a schematic cross-sectional view showing a light-emitting device of a second variation of the first embodiment. 
         FIG.  7    is a schematic perspective view showing an example of the external appearance of a light-emitting device of a third variation of the first embodiment. 
         FIG.  8    is a schematic cross-sectional view of the light-emitting device  100 D shown in  FIG.  7    taken along a plane parallel to the Z-X plane of  FIG.  7    in the center or its vicinity of the light-emitting device  100 D. 
         FIG.  9    is a schematic cross-sectional view showing a light-emitting device of a fourth variation of the first embodiment. 
         FIG.  10    is a schematic cross-sectional view showing a light-emitting device of a fifth variation of the first embodiment. 
         FIG.  11    is a flowchart illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  12    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  13    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  14    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  15    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  16    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  17    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  18    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  19    is a schematic cross-sectional view for′ illustrating an exemplary light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  20    is a schematic cross-sectional view for illustrating a variation of the light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  21    is a schematic stepwise cross-sectional view showing a resultant structure after a wiring is formed inside a groove structure  210   g  of  FIG.  20   . 
         FIG.  22    is a schematic bottom view showing an example where light-emitting, elements  220  of a plurality of light-emitting modules  200 A are electrically connected together by the first wiring  310 , the second wiring  320  and the third wiring  330  formed in the groove structure  210   g.    
         FIG.  23    is a schematic bottom view showing another example of the electrical connection of the plurality of light-emitting modules by the first wiring  310  and the second wiring  320 . 
         FIG.  24    is a schematic bottom view showing an example where a plurality of light-emitting modules are two-dimensionally arrayed. 
         FIG.  25    is a schematic bottom view showing an example where a plurality of light-emitting modules are electrically connected together by wirings. 
         FIG.  26    is a schematic cross-sectional view for illustrating another variation of a light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  27    is a schematic cross-sectional view for illustrating another variation of a light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  28    is a schematic cross-sectional view for illustrating another variation of a light-emitting device manufacturing method of the first embodiment of the present disclosure. 
         FIG.  29    is a schematic cross-sectional view showing a light-emitting device of a second embodiment of the present disclosure. 
         FIG.  30    is a schematic bottom view of the light-emitting device  100 L shown in  FIG.  29    as viewed from the lower surface  100   b  side. 
         FIG.  31    is a flowchart illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  32    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  33    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  34    is a schematic bottom view showing a resultant structure after part of a mask  230 M is removed by laser light irradiation from the structure shown in  FIG.  32   . 
         FIG.  35    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  36    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  37    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  38    is a schematic cross-sectional view for illustrating an exemplary light-emitting device manufacturing method of the second embodiment of the present disclosure. 
         FIG.  39    is a schematic cross-sectional view showing a resultant structure after the light-emitting device  100 M shown in  FIG.  38    is mounted to a wiring board  500 . 
         FIG.  40    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 1-1. 
         FIG.  41    shows a cross-sectional profile of the sample of Example 1-1. 
         FIG.  42    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 1-2. 
         FIG.  43    shows a cross-sectional profile of the sample of Example 1-2. 
         FIG.  44    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 1-3. 
         FIG.  45    shows a cross-sectional profile of the sample of Example 1-3. 
         FIG.  46    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 1-4. 
         FIG.  47    shows a cross-sectional profile of the sample of Example 1-4. 
         FIG.  48    shows a microscopic image of a bottom surface of a groove structure of the sample of Reference Example 1-1. 
         FIG.  49    shows a cross-sectional profile of the sample of Reference Example 1-1. 
         FIG.  50    shows a microscopic image of the second portion before being filled with an electrically-conductive paste. 
         FIG.  51    shows a microscopic image of a cross section after the second portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
         FIG.  52    shows a microscopic image of the third portion before being filled with an electrically-conductive paste. 
         FIG.  53    shows a microscopic image of a cross section after the third portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
         FIG.  54    shows a microscopic image of the fourth portion before being filled with an electrically-conductive paste. 
         FIG.  55    shows a microscopic image of a cross section after the fourth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
         FIG.  56    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 2-1. 
         FIG.  57    shows a cross-sectional profile of the sample of Example 2-1. 
         FIG.  58    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 2-2. 
         FIG.  59    shows a cross-sectional profile of the sample of Example 2-2. 
         FIG.  60    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 2-3. 
         FIG.  61    shows a cross-sectional profile of the sample of Example 2-3. 
         FIG.  62    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 2-4. 
         FIG.  63    shows a cross-sectional profile of the sample of Example 2-4. 
         FIG.  64    shows a cross-sectional profile of the sample of Reference Example 2-1. 
         FIG.  65    shows a microscopic image of the sixth portion before being filled with an electrically-conductive paste. 
         FIG.  66    shows a microscopic image of a cross section after the sixth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
         FIG.  67    shows a microscopic image of the eighth portion before being filled with an electrically-conductive paste. 
         FIG.  68    shows a microscopic image of a cross section after the eighth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
         FIG.  69    shows a microscopic image of the ninth portion before being filled with an electrically-conductive paste. 
         FIG.  70    shows a microscopic image of a cross section after the ninth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
         FIG.  71    shows a microscopic image of a bottom surface of a groove structure of the sample of Example 3-3 before being filled with an electrically-conductive paste. 
         FIG.  72    is a plan view showing the external appearance of a wiring after the tape was peeled off in the sample of Example 3-3. 
         FIG.  73    shows a microscopic image of a bottom surface of a groove structure of the sample of Comparative Example 3-1 before being filled with an electrically-conductive paste. 
         FIG.  74    is a plan view showing the external appearance of a wiring after the tape was peeled off in the sample of Comparative Example 3-2. 
         FIG.  75    shows a microscopic image of a bottom surface of a light-emitting structure after the groove structure formation step was performed. 
         FIG.  76    shows an image of a portion enclosed by a broken circle shown in  FIG.  75   , which was obtained by a laser microscope. 
         FIG.  77    shows an image of a cross section of a groove structure, which was obtained by a laser microscope. 
         FIG.  78    shows a microscopic image of a cross section of the sample of Example 4-1 after the electrically-conductive paste was cured. 
         FIG.  79    shows a microscopic image of a bottom surface of a light-emitting structure after the groove structure formation step was performed but before the wiring formation step was performed. 
         FIG.  80    shows a SEM image of part of a bottom portion of a groove structure. 
         FIG.  81    shows an image of a portion enclosed by a broken circle shown in  FIG.  79   , which was obtained by a laser microscope. 
         FIG.  82    shows an image of a cross section of a groove structure, which was obtained by a laser microscope. 
         FIG.  83    shows a microscopic image of a cross section of the sample of Example 4-2 after the electrically-conductive paste was cured. 
         FIG.  84    shows a microscopic image of a bottom surface of a light-emitting structure after the groove structure formation step was performed but before the wiring formation step was performed. 
         FIG.  85    shows a SEM image of part of a bottom portion of a groove structure. 
         FIG.  86    shows an image of a portion enclosed by a broken circle shown in  FIG.  84   , which was obtained by a laser microscope. 
         FIG.  87    shows an image of a cross section of a groove structure, which was obtained by a laser microscope. 
         FIG.  88    shows a microscopic image of a cross section of the sample of Reference Example 4-1 after the electrically-conductive paste was cured. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The embodiments which will be described below are merely exemplary. A light-emitting device and light-emitting device manufacturing method of the present disclosure are not limited to the embodiments which will be described below. For example, values, shapes, materials, steps and the order of steps which, will be specified in the embodiments described below are merely exemplary, and various modifications thereto are possible so long as no technical inconsistency occurs. 
     The dimensions and sizes of components shown in the drawings are sometimes exaggerated for clear understanding. The dimensions, shapes, and relative sizes of components in an actual light-emitting device and manufacturing apparatus are sometimes not reflected in the drawings. To avoid excessively complicated drawings, some components are sometimes not shown in the drawings. 
     In the following description, components which have substantially the same function are designated by a common reference numeral, and the description thereof is sometimes omitted. In the following description, the terms which designate specific directions or positions (e.g., “upper”, “lower”, “right”, “left”, and other terms including such terms) are sometimes used. Such terms are used merely for clear understanding of relative directions or positions in the referred drawings. So long as the relationship of relative directions or positions designated by terms such as “upper”, “lower”, etc., in the referred drawings is identical, drawings other than those provided in the present disclosure or actual products and manufacturing equipment may not have identical arrangements to those shown in the referred drawings. In the present disclosure, “parallel” includes the cases where two lines, sides or planes are in the range of about ±5° from 0° unless otherwise specified. In the present disclosure, “perpendicular” or “intersection” includes the cases where two lines, sides or planes are in the range of about ±5° from 90° unless otherwise specified. 
     First Embodiment 
       FIG.  1    shows an exemplary light-emitting device of the first embodiment of the present disclosure.  FIG.  1    shows an example of the external appearance of a light-emitting device  100 A according to the first embodiment of the present disclosure as viewed from the upper surface  100   a  side. In  FIG.  1   , arrows indicative of X-direction, Y-direction and Z-direction, which are perpendicular to one another, are also shown some of the other drawings of the present disclosure, arrows indicative of these directions are shown. 
     In the configuration illustrated in  FIG.  1   , the light-emitting device  100 A has the shape of a substantially rectangular parallelepiped. In this example, the outline of the upper surface  100   a  of the light-emitting device  100 A as viewed from the top is substantially square. In  FIG.  1   , the sides of the square shape of the upper surface  100   a  are coincident with the X-direction and the Y-direction illustrated in the drawing. In the embodiments of the present disclosure, the shape of the light-emitting device as viewed from the top is not required to be square. Also, the shape of the light-emitting device as viewed from the top is not required to be rectangular including square. 
       FIG.  2    schematically shows a cross section of the light-emitting device  100 A taken along a plane parallel to the Z-X plane of  FIG.  1    in the center or its vicinity of the light-emitting device  100 A.  FIG.  3    shows an example of the external appearance of the light-emitting device  100 A shown in  FIG.  1    as viewed from the lower surface  100   b  side that is opposite to the upper surface  100   a . As schematically shown in  FIG.  2   , the light-emitting device  100 A generally includes at least one light-emitting module  200 A which includes at least one light-emitting element  220  and a first wiring  310  and a second wiring  320  which are provided on the lower surface  100   b  side (i.e., opposite to the upper surface  100   a ). As illustrated in the drawings, a groove structure  210   g  is provided on the lower surface side of the light-emitting module  200 A (i.e., opposite to the upper surface  100   a  of the light-emitting device  100 A). In this example, the groove structure  210   g  includes two portions, the first portion  210   ga  and the second portion  210   gb . The first wiring  310  and the second wiring  320  described above are positioned in this groove structure  210   g.    
     The light-emitting module  200 A further includes a package  210 A encapsulating the light-emitting element  220 . The package  210 A covers the light-emitting element  220 . The configuration illustrated in  FIG.  1   ,  FIG.  2    and  FIG.  3    includes a protecting member  211 , a wavelength converting member  212 , a light guiding member  213  and a light reflecting member  214 A. Hereinafter, respective components of the light-emitting device  100 A will be described in detail. 
     Light-Emitting Element  220   
     A typical example of the light-emitting element  220  is a light emitting diode (LED). In the configuration illustrated in  FIG.  2   , the light-emitting element  220  includes an element body  223  which has an upper surface  223   a  and lateral surfaces  223   c . In this example, the upper surface  223   a  of the element body  223  configures the upper surface of the light-emitting element  220 . 
     The element body  223  includes, for example, a supporting substrate of sapphire, gallium nitride or the like, and a semiconductor multilayer structure on the supporting substrate: The semiconductor multilayer structure includes an active layer, an n-type semiconductor layer and a p-type semiconductor layer. The active layer is interposed between the n-type semiconductor layer and the p-type semiconductor layer. The semiconductor multilayer structure can include a nitride semiconductor (In x Al y Ga 1-x-y N, 0≤x, 0≤y, x+y≤1) which is capable of emitting light in the range of ultraviolet to visible light. Herein, an LED capable of emitting blue light is illustrated as the light-emitting element  220 . 
     The light-emitting element  220  further includes a first electrode  221  and a second electrode  222  which are present on the lower surface  100   b  side of the light-emitting device  100 A. The first electrode  221  and the second electrode  222  are a pair of a cathode and an anode and have the function of supplying a predetermined electric current to the semiconductor multilayer structure. The first electrode  221  and the second electrode  222  are, typically, Cu electrodes. 
     The first electrode  221  has a lower surface  221   b . The second electrode  222  has a lower surface  222   b . The lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  are exposed out of the light reflecting member  214 A which will be described later. As illustrated in the drawing, the positions of these lower surfaces&#39;  221   b ,  222   b  are substantially coplanar with the position of the lower surface  214   b  of the light reflecting member  214 A. 
     Protecting Member  211   
     The protecting member  211  is a plate-like member which is present above the upper surface of the light-emitting element  220  in the package  210 A. The protecting member  211  has an upper surface  211   a , a lower surface  211   b , and lateral surfaces  211   c  extending between the upper surface  211   a  and the lower surface  211   b . In this example, the upper surface  211   a  of the protecting member  211  is surrounded by the light reflecting member  214 A and is part of the emission region of the upper surface  100   a  of the light-emitting device  100 A from which light from the light-emitting element  220  exits. 
     The protecting member  211  is, typically, light-transmitting layer which contains a resin as a base material. Examples of the material of the protecting member  211  include silicone resin, modified silicone resin, epoxy resin, phenolic resin, polycarbonate resin, acrylic resin, trimethylpentene resin, polynorbornene resin, and a resin composition containing two or more of these resins. Alternatively, the protecting member  211  can be a layer which is made of glass. In this specification, the term “light-transmitting” is interpreted so as to include being diffusive for incident light and is not limited to being “transparent”. 
     Wavelength Converting Member  212   
     The wavelength converting member  212  is present between the lower surface  211   b  of the protecting member  211  and the upper surface of the light-emitting element  220 . The wavelength converting member  212  has an upper surface  212   a , a lower surface  212   b , and lateral surfaces  212   c . In the example shown in  FIG.  2   , the lateral surfaces  212   c  of the wavelength converting member  212  are coplanar with the lateral surfaces  211   c  of the protecting member  211 . 
     The wavelength converting member  212  is, typically, a resin member in which particles of a phosphor are dispersed. The wavelength converting member  212  absorbs at least part of light emitted from the light-emitting element  220 , and emits light of a different wavelength from that of the light emitted from the light-emitting element  220 . For example, the wavelength converting member  212  converts the wavelength of part of blue light from the light-emitting element  220 , and emits yellow light. With such a configuration, blue light which has passed through the wavelength converting member  212  and the yellow light emitted from the wavelength converting member  212  are mixed together, whereby white light is produced. 
     The phosphor can be a known material. Examples of the phosphor include YAG-based phosphors, fluoride-based phosphors, and nitride-based phosphors. The YAG-based phosphors are examples of a wavelength conversion substance capable of converting blue light to yellow light. A KSF-based phosphor which is one of the fluoride-based phosphors and a CASN phosphor and a SCASN phosphor which are nitride phosphors are examples of a wavelength conversion substance capable of converting blue light to red light. A β-sialon phosphor which is another example of the nitride phosphors is an example of a wavelength conversion substance capable of converting blue light to green light. The phosphor can be a quantum dot phosphor. Examples of the base material in which the phosphor particles are to be dispersed include silicone resin, modified silicone resin, epoxy resin, modified epoxy resin, urea resin, phenolic resin, acrylic resin, urethane resin, fluoric resin, and a resin containing two or more of these resins. 
     Light Guiding Member  213   
     The light guiding member  213  is a light-transmitting structure which mechanically and optically connects the light-emitting element  220  with the lower surface  212   b  of the wavelength converting member  212 . As shown in  FIG.  2   , part of the light guiding member  213  covers at least part of the lateral surfaces  223   c  of the element body  223  of the light-emitting element  220  The light guiding member  213  typically includes a portion which is present between the upper surface of the light-emitting element  220  and the lower surface  212   b  of the wavelength converting member  212 . 
     As schematically shown in  FIG.  2   , the outer surface  213   d  of the light guiding member  213  is covered with the light reflecting member  214 A. Therefore, light emitted from the lateral surfaces  223   c  of the element body  223  so as to enter the light guiding member  213  is reflected at the outer surface  213   d  of the light guiding member  213 , in other words, at the position of the interface between the light guiding member  213  and the light reflecting member  214 A, toward a region above the light-emitting element  220  so as to enter the wavelength converting member  212 . Thus, the light guiding member  213  contributes to increasing the amount of light extracted from the upper surface  100   a  of the light-emitting device  100 A via the wavelength converting member  212  and the protecting member  211 . Providing the light guiding member  213  improves the light extraction efficiency. 
     The light guiding member  213  transmits not less than 60% of light with respect to light having the emission peak wavelength which is emitted from the light-emitting element  220 . From the viewpoint of effectively utilizing light, the transmittance of the light guiding member  213  at the emission peak wavelength of the light-emitting element  220  is preferably not less than 70%, more preferably not less than 80%. The material of the light guiding member  213  can be a resin composition which contains a transparent resin as the base material. A typical example of the base material of the light guiding member  213  is a thermosetting resin, such as epoxy resin, silicone resin, etc. As the base material of the light guiding member  213 , a silicone resin, a modified silicone resin, an epoxy resin, a phenolic resin, a polycarbonate resin, an acrylic resin, a polymethylpentene resin, a polynorbornene resin, or a material containing two or more of these resins can be used. For example, a material whose refractive index is different from that of the base material can be dispersed in the material of the light guiding member  213  such that the light guiding member  213  has a light diffusing function. 
     When the light guiding member  213  covers a larger region of the lateral surfaces of the light-emitting element  220 , a larger amount of light can be guided to a region above the light-emitting element  220 . From this viewpoint, the light guiding member  213  can entirely cover the lateral surfaces  223   c  of the element body  223 , from the lower end to the upper end. The cross-sectional shape of the outer surface  213   d  of the light guiding member  213  is not required to be a linear shape such as shown in  FIG.  2   . The cross-sectional, shape of the outer surface  213   d  can be a shape consisting of lines, a curved line that protrudes toward the light emitting element  220 , or a curved line that protrudes away from the light emitting element  220 . 
     Light Reflecting Member  214 A 
     The light reflecting member  214 A is a light-reflective structure surrounding the above-described light-emitting element  220  and other components. In this specification, the term “light-reflective” or “light reflecting” means that the reflectance at the emission peak wavelength of the light-emitting element  220  is not less than 60%. The reflectance of the light reflecting member  214 A at the emission peak wavelength of the light-emitting element  220  is more preferably not less than 70%, still more preferably not less than 80%. 
     The light reflecting member  214 A covers the outer surface  213   d  of the light guiding member  213  and part of the lateral surfaces of the light-emitting element  220  which is not covered with the light guiding member  213 . Also, the light reflecting member  214 A covers the lower surface of the element body  223  of the light-emitting element  220  excluding regions in which the first electrode  221  and the second electrode.  222  are provided. The light reflecting member  214 A covering the lower surface of the element body  223  of the light-emitting element  220  excluding regions in which the first electrode  221  and the second electrode  222  are provided can reflect light traveling toward the lower surface  100   b  side to direct it toward the upper surface  100   a  side of the light-emitting device  100 A, so that the light extraction efficiency can improve. 
     As the material of the light reflecting member  214 A, for example, a resin composition in which a light-reflective filler is dispersed can be used. As the base material of the light reflecting member  214 A, a silicone resin, a phenolic resin, an epoxy resin, a BT resin, polyphthalamide (PPA), or the like, can be used. As the light-reflective filler, metal particles or particles of an inorganic or organic material which has a higher refractive index than the base material can be used. Examples of the reflective filler include particles of titanium dioxide, silicon oxide, zirconium dioxide, potassium titanate, aluminum oxide, aluminum nitride, boron nitride, mullite, niobium oxide or barium sulfate, or particles of rare-earth oxides, such as yttrium oxide, gadolinium oxide, etc. From the viewpoint of achieving high reflectance, the color of the light reflecting member  214 A is advantageously white. Alternatively, as the material of the light reflecting member  214 A, a fiberglass-reinforced plastic_(e.g., glass epoxy resin) or a ceramic material of aluminum nitride, aluminum oxide, zirconium oxide, or the like, can be used. 
     First Wiring  310  and Second Wiring  320   
     The first wiring  310  and the second wiring.  320  are electrically-conductive structures provided inside the groove structure  210   g  that is formed in the lower surface of the light-emitting module  200 A, in other words, in a surface opposite to the upper surface  211   a  of the protecting member  211 . In this example, as shown in  FIG.  2    and  FIG.  3   , the first wiring  310  is provided inside the first portion  210   ga  of the groove structure  210   g , while the second wiring  320  is provided inside the second portion  210   gb  of the groove structure  210   g  which is separate from the first portion  210   ga . That is, the second wiring  320  is provided inside the second portion  210   gb , whereby the second wiring  320  is electrically separated from the first wiring  310 . The shape of the groove structure  210   g  shown in  FIG.  3    is merely exemplary. The shape of the groove structure  210   g  as viewed from the bottom can be appropriately determined. 
     The first wiring  310  has a lower surface  310   b  which is exposed out of the lower surface  214   b  of the light reflecting member  214 A. Likewise, the second wiring  320  has a lower surface  320   b  which is exposed out of the lower surface  214   b  of the light reflecting member  214 A. As shown in  FIG.  2   , in this example, the lower surface  310   b  of the first wiring  310  and the lower surface  320   b  of the second wiring  320  are substantially coplanar with the lower surface  214   b  of the light reflecting member  214 A, which corresponds to the lower surface of the package  210 A, and with the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222 . That is, herein, it can be said that the lower surface  100   b  of the light-emitting device  100 A is formed by the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222 , the lower surface  214   b  of the light reflecting member  214 A, and the lower surface  310   b  of the first wiring  310  and the lower surface  320   b  of the second wiring  320 . 
     As schematically shown in  FIG.  2   , the bottom portion of the first portion  210   ga  of the groove structure  210   g  and the bottom portion of the second portion  210   gb  of the groove structure  210   g  are not required to be a flat surface but can have surface unevenness. In the configuration illustrated in  FIG.  2   , the first wiring  310  and the second wiring  320  respectively have a shape matched with the shape of the bottom portion of the first portion  210   ga  and the bottom portion of the second portion  210   gb  of the groove structure  210   g  according to the surface unevenness at the bottom portion of the first portion  210   ga  and the bottom portion of the second portion  210   gb  of the groove structure  210   g . With the structure in which the bottom portion of the first portion  210   ga  and the bottom portion of the second portion  210   gb  have surface unevenness and each of the first wiring  310  and the second wiring  320  has a shape matched with the shape of the surface unevenness, a greater anchoring effect can be produced. That is, the effect of alleviating separation of the first wiring  310  or the second wiring  320  from the light-emitting module  200 A can be achieved. As will be described later, the bottom surface of the first portion  210   ga  and the bottom surface of the second portion  210   gb  can be formed by a structure such as a plurality of grooves. Hereinafter, the bottom surface of the first portion  210   ga  is also referred to as “first bottom surface  21 ”, and the bottom surface of the second portion  210   gb  is also referred to as “second bottom surface  22 ”. 
     As will be specifically described later the first wiring  310  and the second wiring  320  are formed by supplying an electrically-conductive material inside the first portion  210   ga  and the second portion  210   gb  of the groove structure  210   g , and thereafter curing the electrically-conductive material. The first portion  210   ga  of the groove structure  210   g  has a depth of, for example, not less than 5 μm and not more than 50 μm. Likewise, the second portion  210   gb  of the groove structure  210   g  has a depth of, for example, not less than 5 μm and not more than 50 μm. Therefore, the first wiring  310  and the second wiring  320  also have a depth (i.e., thickness) of, approximately, not less than 5 μm and not more than 50 μm. 
     As schematically shown in  FIG.  2   , part of the first electrode  221  and part of the second electrode  222  of the light-emitting element  220  are recessed relative to the lower surface  214   b  of the light reflecting member  214 A. That is, in this example, part of the surface of the first electrode  221  forms part of the first bottom surface  21  of the first portion  210   ga . In other words, part of the first electrode  221  is exposed to an inside of the first portion  210   ga  of the groove structure  210   g . The part of the first electrode  221  exposed inside the groove structure  210   g  includes a stepped portion St 1  which has a lateral surface  221   c . The first wiring  310  is connected with the part of the first electrode  221  exposed inside the first portion  210   ga  of the groove structure  210   g , and is hence electrically connected with the first electrode  221 . 
     Likewise, part of the surface of the second electrode  222  forms part of the second bottom surface  22  of the second portion  210   gb . That is, part of the second electrode  222  is exposed to an inside of the second portion  210   gb  of the groove structure  210   g . The part of the second electrode  222  exposed inside the groove structure  210   g  includes a stepped portion St 2  which has a lateral surface  222   c . The second wiring  320  is connected with the part of the second electrode  222  exposed inside the second portion  210   gb  of the groove structure  210   g , and is hence electrically connected with the second electrode  222 . 
       FIG.  4    schematically shows a structure without supplying the first wiring  310  and the second wiring  320  shown as the structure in  FIG.  3   . It can be said that  FIG.  4    shows the light-emitting module  200 A of the light-emitting device  100 A. In the example shown in  FIG.  4   , the first bottom surface  21  of the first portion  210   ga  and the second bottom surface  22  of the second portion  210   gb  of the groove structure  210   g  include a set of a plurality of first grooves Gr 1  extending in the first direction. Particularly, in this example, the first bottom surface  21  of the first portion  210   ga  and the second bottom surface  22  of the second portion  210   gb  are formed by a set of the plurality of first grooves Gr 1 . 
     As will be specifically described later, the first grooves Gr 1  can be formed by scanning with a laser light beam in the first direction. By irradiating the lower surface of the package  210 A and the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  with laser light at a predetermined pitch in the first direction, part of the light reflecting member  214 A, part of the first electrode  221  and part of the second electrode  222  are removed. Thereby, the plurality of first grooves Gr 1  are formed, and a set of the plurality of first grooves Gr 1  can form the above-described groove structure  210   g.    
     In  FIG.  4   , the first direction is designated by double-headed arrow d 1 . In the example shown in  FIG.  4   , the first direction is different from each of the X-direction and the Y-direction in the drawing. However, the scanning direction of the laser light beam can be appropriately determined, and the first direction can be identical with the X-direction or the Y-direction. Each of the first grooves Gr 1  is typically formed by pulsed irradiation of laser light in the first direction such that laser spots partially overlap. Therefore, the extending direction of the first portion  210   ga  of the groove structure  210   g  and the extending direction of the second portion  210   gb  of the groove structure  210   g  are not restricted by the first direction (i.e., the extending direction of the first grooves Gr 1 ). The shape of the groove structure  210   g  as viewed from the bottom can be appropriately determined. 
     In the example shown in  FIG.  4   , the first bottom surface  21  of the first portion  210   ga  and the second bottom surface  22  of the second portion  210   gb  further have a plurality of first recesses Dc 1  in the dot shapes. As schematically shown in  FIG.  4   , the diameters of the first recesses Dc 1  are typically greater than the width of the first grooves Gr 1 . In  FIG.  4   , the first recesses Dc 1  are shown larger with some exaggeration for convenience in description. In some of the other drawings, the first recesses Dc 1  and other elements are shown with some exaggeration. 
     As will be described later, the plurality of first recesses Dc 1  can also be formed by laser light irradiation. However, the irradiation pattern of the laser light in formation of the plurality of first recesses Dc 1  is different from that in formation of the first grooves Gr 1 . In this specification, “different irradiation pattern” is not limited to such an operation that the trace of movement of the laser spot is different, but broadly interpreted so as to include such an operation that the traces of movements of the laser spots (or the traces of movements of the laser heads relative to the stages) are identical but the laser powers, the pulse intervals and the like are different between the first laser light irradiation step and the second laser light irradiation step. 
     Herein, the plurality of first recesses Del are in a triangular lattice arrangement. As a matter of course, the arrangement of the plurality of first recesses Dc 1  can be appropriately determined. The first recesses Dc 1  can be formed across the bottom portion of the groove structure  210   g  with a uniform density. With respect to the distance between the centers of two of the first recesses Dc 1 , the plurality of first grooves Gr 1  can have a pitch in the range of, for example, not less than 10% and not more than 100%. 
     Part of the above-described first wiring  310  and part of the above-described second wiring  320  are present inside the first grooves Gr 1 . That is, the inside of the first grooves Gr 1  is filled with the first wiring  310  or the second wiring  320  as schematically shown in  FIG.  2   . The inside of the plurality of first recesses Dal is also filled with the first wiring  310  or the second wiring  320 . 
     As previously described, the first wiring  310  and the second wiring  320  which are provided on the lower surface  100   b  side of the light-emitting device  100 A are respectively electrically connected with the first electrode  221  and the second electrode  222  of the light-emitting element  220 . Therefore, a pair of the first wiring  310  and the second wiring  320  can function as a pair of the cathode and the anode of the light-emitting device  100 A. That is, by connecting a driver, a power supply circuit, etc., to the first wiring  310  and the second wiring  320 , the light-emitting device  100 A can be driven. 
     For example, as understood from  FIG.  3   , by providing the first wiring  310  and the second wiring  320 , the distance between the contact portion on the cathode side and the contact portion on the anode side in the light-emitting device  100 A can be made greater than the space between the first electrode  221  and the second electrode  222 . That is, this can achieve a substantially equivalent effect in the case where enlarging the distance between the electrodes by an interposer. Thus, according to an embodiment of the present disclosure, a wiring pattern for power supply is included in the light-emitting device side. For example, it is not necessary to use a wiring board having complicated wiring patterns, and mounting of light-emitting devices becomes easier. 
     Further, according to an embodiment of the present disclosure, the distance from the surface of the substrate which supports the light-emitting device  100 A to the upper surface  100   a  of the light-emitting device  100 A does not increase unlike the case where an interposer is provided. As shown in  FIG.  2   , in a configuration where the lower surface  310   b  of the first wiring  310  and the lower surface  320   b  of the second wiring  320  are substantially coplanar with the lower surface of the package  210 A, these wirings do not protrude from the lower surface of the package  210 A. Therefore, it is advantageous in providing thinner light-emitting devices. 
     The groove structure  210   g  for holding the first wiring  310  and the second wiring  320  can have a bottom surface which has surface unevenness (e.g., microscopic concave and convex pattern) as previously described with reference to FIG. and  FIG.  4   . When the groove structure  210   g  has surface unevenness in the bottom portion, the area of the interface between the first wiring  310  or the second wiring  320  and the groove structure  210   g  increases so that a higher anchoring effect can be achieved. Therefore, separation of the first wiring  310  and the second wiring  320  can be alleviated, and a light-emitting device with improved reliability can be provided. Particularly in the example shown in  FIG.  2   , the first electrode  221  includes the stepped portion St 1  which is exposed inside the groove structure  210   g , and the second electrode  222  includes the stepped portion St 2  which is exposed inside the groove structure  210   g . Because the first electrode  221  includes the stepped portion St 1 , the area of the interface between the first electrode  221  and the first wiring  310  increases, and separation of the first wiring  310  can be alleviated more effectively. Likewise, because the second electrode  222  includes the stepped portion St 2 , the area of the interface between the second electrode  222  and the second wiring  320  increases, and separation of the second wiring  320  is suppressed. 
     First Variation 
       FIG.  5    shows a light-emitting device of the first variation of the first embodiment.  FIG.  5    shows a structure in which the first wiring  310  and the second wiring  320  are omitted from the light-emitting device likewise as in  FIG.  4    for convenience of description. That is, in  FIG.  5   , the light-emitting module  200 B is taken out from the light-emitting device  100 B of the first variation of the first embodiment. The external appearance of the light-emitting device  100 B shown in  FIG.  5    as viewed from the upper surface  100   a  side and the external appearance of the light-emitting device  100 B as viewed from the lower surface  100   b  side can respectively be the same as those shown in  FIG.  1    and  FIG.  3   . 
     Likewise as in the example described with reference to  FIG.  4   , the light-emitting module  200 B of the light-emitting device  100 B has a groove structure  210   g  in a lower surface corresponding to the lower surface  100   b  of the light-emitting device  100 B. The groove structure  210   g  of the light-emitting module  200 B has a plurality of first grooves Gr 1  in its bottom portion and is, in this respect, equal to the groove structure  210   g  of the light-emitting module  200 A shown in  FIG.  4   . However, the groove structure  210   g  of the light-emitting module  200 B has a plurality of second grooves Gr 2  which are formed so as to overlap the plurality of first grooves Gr 1  instead of the plurality of first recessed portions Dc 1 . 
     As schematically shown in  FIG.  5   , the plurality of second grooves Gr 2  extend in the second direction that is different from the first direction in which the plurality of first grooves Gr 1  extend. In  FIG.  5   , the second direction is designated by double-headed arrow d 2 . The second grooves Gr 2  can be formed by scanning with a laser light beam in the second direction in the same manner as the first grooves Gr 1  after the plurality of first grooves Gr 1  are formed. The second direction can be an appropriately selected direction so long as it meets the first direction. In this sense, the irradiation pattern of the laser light in formation of the second grooves Gr 2  is different from the irradiation pattern of the laser light in formation of the first grooves Gr 1 . The depth and width of the second grooves Gr 2  and the pitch between the second grooves Gr 2  can be equal to, or can be different from, those of the first grooves Gr 1 . 
     By forming the plurality of second grooves Gr 2  so as to overlap the plurality of first grooves Gr 1 , portions which are deeper than the first grooves Gr 1  and the second grooves Gr 2  can be formed at the meeting position of the first grooves Gr 1  and the second grooves Gr 2 . Such deeper portions formed in the light reflecting member  214 A, the first electrode  221  or the second electrode  222  can be referred to as “second recessed portions”. Likewise as in the above-described light-emitting device  100 A, the inside of the first grooves Gr 1  and the inside of the second grooves Gr 2  can be filled with the first wiring  310  or the second wiring  320 . Likewise, the first wiring  310  or the second wiring  320  can also be present inside the second recessed portions. As in this example, also by forming a plurality of grooves in the form of a grid, the area of the interface between the first wiring  310  or the second wiring  320  and the bottom portion of the groove structure  210   g  increases, and as a result, increase of the anchoring effect can be expected. 
     Second Variation 
       FIG.  6    shows a light-emitting device of the second variation of the first embodiment.  FIG.  6    schematically shows a cross section of the light-emitting device of the second variation taken along a plane perpendicular to the upper surface in the center or its vicinity of the light-emitting device as does  FIG.  2   . The light-emitting device  100 C shown in  FIG.  6    is different from the light-emitting device  100 A shown in  FIG.  1    in that the light-emitting device  100 C includes a light-emitting module  200 C instead of the light-emitting module  200 A. The light-emitting module  200 C includes a light-emitting element  220  and a package  210 C. 
     As schematically shown in  FIG.  6   , in this example, a part of the first bottom surface  21  of the first portion  210   ga  of the groove structure  210   g  which is formed in the first electrode  221  of the light-emitting element  220  has a smaller depth (i.e., shallower) than another part of the first bottom surface  21  which is formed in a region outside the first electrode  221  of the light-emitting element  220 , in other words, another part of the first bottom surface  21  which is formed in a light-reflective member  214 C of the package  210 C. Likewise, a part of the second bottom surface  22  of the second portion  210   gb  which is formed in the second electrode  222  of the light-emitting element  220  is shallower than another part of the second bottom surface  22  which is formed in the light-reflective member  214 C of the package  210 C. That is, in this example, a part of the first wiring  310  overlapping the light-reflective member  214 C is thicker than another part of the first wiring  310  overlapping the first electrode  221 , and a part of the second wiring  320  overlapping the light-reflective member  214 C is thicker than another part of the second wiring  320  overlapping the second electrode  222 . 
     By making a part of the groove structure not overlapping an electrode of a light-emitting element relatively deep, a larger part of the surface of the electrode (e.g., the lateral surfaces of the electrode) can be exposed inside the groove structure than in a configuration where a part of the groove structure overlapping the electrode of the light-emitting element and the other part of the groove structure have substantially equal depths as in the example shown in  FIG.  2   . Therefore, the contact area between the first wiring  310  and the first electrode  221  and the contact area between the second wiring  320  and the second electrode  222  increase, and the contact resistance between the first wiring  310  and the first electrode  221  and the contact resistance between the second wiring  320  and the second electrode  222  decrease, thereby achieving the effect of reducing the power consumption. 
     Alternatively, a part of the groove structure overlapping the electrode of the light-emitting element can be made relatively deep by repeatedly scanning of the first electrode  221  and the second electrode  222  with a laser light beam. The contact area between the first wiring  310  and the first electrode  221  and the contact area between the second wiring  320  and the second electrode  222  increase. Due to the increase of the anchoring effect, the probability of separation of the first wiring  310  and the second wiring  320  from the first electrode  221  or the second electrode  222  can be reduced. 
     Third Variation 
       FIG.  7    and  FIG.  8    show a light-emitting device of the third variation of the first embodiment.  FIG.  7    shows an example as the external appearance of the light-emitting device  100 D of the third variation according to the first embodiment as viewed from the upper surface  100   a  side.  FIG.  8    schematically shows a cross section of the light-emitting device  100 D shown in  FIG.  7    taken along a plane parallel to the Z-X plane of  FIG.  7    in the center or its vicinity of the light-emitting device  100 D. 
     The light-emitting device  100 D shown in  FIG.  7    and  FIG.  8    is different from the light-emitting device  100 A shown in  FIG.  1    in that the light-emitting device  100 D includes a package  210 D instead of the package  210 A. The package  210 D includes a light-reflective member  214 D. As shown in  FIG.  8   , the light-emitting device  100 D generally includes a light-emitting module  200 D, a first wiring  310  and a second wiring  320 . The light-emitting module  200 D includes a package  210 A. The following features are the same as those of the previously-described examples: the light-emitting module  200 D has on the lower surface side the groove structure  210   g  which includes the first portion  210   ga  and the second portion  210   gb ; and the first wiring  310  and the second wiring  320  are respectively provided inside the first portion  210   ga  and the second portion  210   gb  of the groove structure  210   g.    
     In the configuration illustrated in  FIG.  7    and  FIG.  8   , the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  are not covered with the light-reflective member  214 D but exposed out of the package  210 D. Thus, in this example, light is extracted not only from the upper surface  211   a  of the protecting member  211  but also from the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  and, therefore, an expanded light distribution characteristic can be achieved, in contrast to the above-described light-emitting devices  100 A,  100 B achieving improved directivity of a light distribution. 
     Fourth Variation 
       FIG.  9    shows a light-emitting device of the fourth variation of the first embodiment.  FIG.  9    schematically shows a cross section of the light-emitting device of the fourth variation taken along a plane perpendicular to the upper surface in the center or its vicinity of the light-emitting device as do  FIG.  2   ,  FIG.  6    and  FIG.  8   . 
     The light-emitting module  200 E of the light-emitting device  100 E shown in  FIG.  9    includes a first light-emitting element  220 A and a second light-emitting element  220 B in part thereof. In the configuration illustrated in  FIG.  9   , each of the first light-emitting element  220 A and the second light-emitting element  220 B is fixed to the lower surface  212   b  of the wavelength converting member  212  by the light guiding member  213 . A package  210 E of the light-emitting module  200 E includes a light-reflective member  214 E in part thereof. The light-reflective member  214 E covers the first light-emitting element  220 A and the second light-emitting element  220 B. 
     Also in this example, the light-emitting module  200 E has a groove structure  210   g  which is provided on the lower surface  100   b  side of the light-emitting device  100 E. However, in this example, the groove structure  210   g  includes three portions, which are the first portion  210   ga , the second portion  210   gb  and the third portion  210   gc . As schematically shown in  FIG.  9   , the first bottom surface  21  of the first portion  210   ga , the second bottom surface  22  of the second portion  210   gb , and the third bottom surface  23  of the third portion  210   gc  are typically uneven surfaces. The shape of unevenness of these bottom surfaces can be formed by the plurality of first grooves Gr 1  and the plurality of first recessed portions Dc 1 , or by the plurality of first grooves Gr 1  and the plurality of second grooves Gr 2 . 
     As shown in the drawing, the first wiring  310  is present inside the first portion  210   ga  of the groove structure  210   g , and the second wiring  320  is present inside the second portion  210   gb . The first wiring  310  is connected with the first electrode  221  of the first light-emitting element  220 A inside the first portion  210   ga . The second wiring  320  is connected with the second electrode  222  of the first light-emitting element  220 A inside the second portion  210   gb . In this example, a third wiring  330  is present inside the third portion  210   gc . In this example, the third wiring  330  is connected with the second electrode  222  of the second light-emitting element  220 B inside the third portion  210   gc . The first electrode  221  of the second light-emitting element  220 B is connected with the second wiring  320  inside the second portion  210   gb.    
     That is, in this example, the first electrode  221  of the second light-emitting element  220 B and the second electrode  222  of the first light-emitting element  220 A are electrically connected with each other by the second wiring  320 . The first electrode  221  of the second light-emitting element  220 B is for example a cathode, and the second electrode  222  of the first light-emitting element  220 A is for example an anode.  FIG.  9    shows an example where the first light-emitting element  220 A and the second light-emitting element  220 B are electrically connected in series. As a matter of course, the electrical connection between the first light-emitting element  220 A and the second light-emitting element  220 B is not required to be performed as this example. For example, the first light-emitting element  220 A and the second light-emitting element  220 B can be electrically connected in parallel by the first wiring  310  and the second wiring  320 . 
     Fifth Variation 
     The light-emitting device can include two light-emitting elements or three or more light-emitting elements. In the configuration illustrated in  FIG.  9   , the first light-emitting element  220 A and the second light-emitting element  220 B are together provided on a single wavelength converting member  212 . However, the present invention is not required to be performed as this example. In the light-emitting module, the wavelength converting member  212  can be provided for each light-emitting element as in the light-emitting device  100 F shown in  FIG.  10   . 
     In the configuration illustrated in  FIG.  10   , the light-emitting module  200 F of the light-emitting device  100 F includes a first light-emitting element  220 A, a second light-emitting element  220 B, and a package  210 F. The package  210 F includes a light-reflective member  214 F which covers the first light-emitting element  220 A and the second light-emitting element  220 B. As illustrated in the drawing, in this example, a set of the wavelength converting member  212  and the protecting member  211  is provided above the first light-emitting element  220 A, and another set of the wavelength converting member  212  and the protecting member  211  is provided above the second light-emitting element  220 B. The wavelength converting member  212  and the protecting member  211  provided above the first light-emitting element  220 A and the wavelength converting member  212  and the protecting member  211  provided above the second light-emitting element  220 B are separated from each other by the light-reflective member  214 F in the package  210 F. 
     When the light-emitting device includes a plurality of light-emitting elements as in the example described with reference to  FIG.  9    and  FIG.  10   , the peak wavelength of light emitted from the light-emitting elements can be different among the light-emitting elements or can be equal among the light-emitting elements. Alternatively, the wavelength converting member  212  provided above the first light-emitting element  220 A and the wavelength converting member  212  provided above the second light-emitting element  220 B can contain different phosphors dispersed in the wavelength converting member  212 . In such a case, even when identical elements are used as the first light-emitting element  220 A and the second light-emitting element  220 B, light having different wavelength ranges can be extracted from the upper surface  211   a  of the protecting member  211  on the first light-emitting element  220 A side and the upper surface  211   a  of the protecting member  211  on the second light-emitting element  220 B side. 
     In the example shown in  FIG.  9    and  FIG.  10   , the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  are covered with the light-reflective member  214 E or  214 F. As a matter of course, the present invention is not required to be performed as this example. The lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  can be exposed out of the light-reflective member  214 E or  214 F. 
     Manufacturing Method of Light-Emitting Device 
     Hereinafter, a light-emitting device manufacturing method of the first embodiment of the present disclosure is described with reference to the drawings.  FIG.  11    shows the outline of a light-emitting device manufacturing method of the first embodiment of the present disclosure. The light-emitting device manufacturing method shown in  FIG.  11    includes providing a light-emitting structure which includes a light-emitting element and a covering member covering the light-emitting element (Step S 1 ), forming a groove structure in the light-emitting structure by laser light irradiation (Step S 2 ), and forming a plurality of wirings (Step S 3 ) by filling the inside of the groove structure with an electrically-conductive material. Hereinafter, details of the respective steps are described with a main example of the light-emitting device  100 E shown in  FIG.  9   . 
     Light-Emitting Structure Providing Step (A) 
     A light-emitting structure is provided which includes a light-emitting element and a covering member covering the light-emitting element (Step S 1  of  FIG.  11   ). Herein, a light-emitting structure is provided which includes a first light-emitting element  220 A, a second light-emitting element  220 B, and a covering member covering these two light-emitting elements. The light-emitting structure can be provided by purchasing or can be formed through a procedure which will be described in the following paragraphs. 
     In production of the light-emitting structure, as shown in  FIG.  12   , a multilayer sheet LS is provided which includes a protecting member  211  and a wavelength converting member  212 . The multilayer sheet LS can be configured with, for example, a phosphor sheet and a light-transmitting resin sheet. These sheets are adhered to each other, and cut the resultant structure into pieces of predetermined dimensions by an ultrasonic cutter or the like, to thereby obtain the multilayer sheet LS. The phosphor sheet can be configured by a resin composition which contains a resin in a precured state and phosphor particles dispersed therein. The phosphor sheet can be made of a resin composition which contains a resin as the base material, a phosphor, filler particles, and a solvent. The base material used can be selected from various resins mentioned as the material of the wavelength converting member  212  (e.g., silicone resin). The phosphor used can also be selected from various phosphors mentioned as the material of the wavelength converting member  212 . The light-transmitting resin sheet can be produced by, for example, curing a light-transmitting resin composition. The material of the light-transmitting resin sheet can be selected from various materials mentioned as the base material of the protecting member  211 , and can optionally contain a light-reflective filler or the like. The multilayer sheet LS can alternatively be produced by applying a resin composition which contains a phosphor onto the light-transmitting resin sheet by an application method such as spraying, casting, potting, and then curing the applied resin composition. The protecting member  211  in the multilayer sheet LS can be a plate of polycarbonate or glass. 
     Then, a light-transmitting resin composition  213   r  is applied to a predetermined position on a primary surface of the multilayer sheet LS on the wavelength converting member  212  side (the lower surface  212   b  of the wavelength converting member  212 ) using a dispenser or the like. Further, as shown in  FIG.  13   , a first light-emitting element  220 A and a second light-emitting element  220 B are placed on the applied resin composition  213   r . In this step, the first light-emitting element  220 A and the second light-emitting element  220 B are placed on the resin composition  213   r  such that the upper surface  223   a  of the element body  223  (equivalent to the upper surface of the first light-emitting element  220 A, the upper surface of the second light-emitting element  220 B) faces the lower surface  212   b  of the wavelength converting member  212 . The resin composition  213   r  used can be selected from the resin compositions mentioned as the material of the light guiding member  213 . By curing the resin composition  213   r , the light guiding member  213  is formed of the resin composition  213   r  while fixing the first light-emitting element  220 A and the second light-emitting element  220 B to the wavelength converting member  212 . 
     Thereafter, a light-reflective resin layer  214 T is formed so as to cover the structure in which the light guiding member  213  has been formed. For example, a structure which includes the light guiding member  213 , the multilayer sheet LS, the first light-emitting element  220 A and the second light-emitting element  220 B is placed on a support  300  such as a heat-resistant adhesive tape as shown in  FIG.  14   , and then the light-reflective resin layer  214 T is formed by transfer molding, spraying, compression molding, etc. As shown in  FIG.  14   , in this example, the light-reflective resin layer  214 T covers the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212 . 
     The material of the light-reflective resin layer  214 T can be selected from the resin compositions mentioned as the material of the light reflecting member  214 A. Alternatively, the light-reflective resin layer  214 T can be in the form of a layer of a foamed plastic such as foamed polyethylene terephthalate (i.e., foamed PET) in which a light-reflective filler is dispersed. 
     After the light-reflective resin layer  214 T is formed, the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  are exposed out of the light-reflective resin layer  214 T by, typically, grinding. As schematically shown in  FIG.  15   , by grinding with a grindstone  430  attached to a grinder, the position of the ground surface  214   g  of the light-reflective resin layer  214 T can be adjusted to the position of the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222 . The lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  do not have to be exposed out of the ground surface  214   g . In a groove structure formation step which will be described later, part of the light-reflective resin layer  214 T can cover the first electrode  221  and the second electrode  222  so long as the positions of the first electrode  221  and the second electrode  222  can be detected through the light-reflective resin layer  214 T. 
     Then, the light-reflective resin layer  214 T is cut into portions of a desired shape using a dicing apparatus and the like. Thereby, as shown in  FIG.  16   , a light-reflective member  214 Ef is formed from the light-reflective resin layer  214 T, and a light-emitting structure  200 Ef which includes a covering member  210 Ef covering the first light-emitting element  220 A and the second light-emitting element  220 B can be formed on the support  300 . The covering member  210 Ef includes the protecting member  211 , the wavelength converting member  212 , the light guiding member  213  and the light-reflective member  214 Ef. 
     The light-emitting structure  200 Ef has an upper surface  200   a  (i.e., second surface), which includes the upper surface  211   a  of the protecting member  211  in part thereof, and a lower surface  200   b  (i.e., first surface) which is opposite to the upper surface  200   a . As illustrated in the drawing, the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  are positioned closer to the lower surface  200   b  than the upper surface  200   a  of the light-emitting structure  200 Ef. In this example, the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  are exposed out of the light-reflective member  214 Ef. In other words, the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  exposed out of the lower surface  200   b  of the light-emitting structure  200 Ef. 
     Groove Structure Formation Step (B) 
     Subsequently, a groove structure is formed in the light-emitting structure by laser light irradiation (Step S 2  of  FIG.  11   ). Herein, the lower surface  200   b  of the light-emitting structure  200 Ef is irradiated with laser light such that a groove structure is formed in the lower surface  200   b.    
     The laser light irradiation can be realized by a known laser ablation apparatus.  FIG.  17    schematically shows an example with a laser ablation apparatus  400  which includes a laser light source  410  and a galvanometer mirror  420 . The number of galvanometer mirrors in the laser ablation apparatus  400  can be two or more. Examples of the laser light source  410  include CO 2  laser, Nd:YAG laser, Nd:YVO 4  laser, and the like. Alternatively, a laser light source called green laser which outputs laser light having 532 nm wavelength can also be used as the laser light source  410 . 
     By scanning the lower surface  200   b  of the light-emitting structure  200 Ef with a laser light beam LB, part of the covering member  210 Ef, part of the first electrode  221  and part of the second electrode  222  can be removed. Herein, part of the covering member  210 Ef, part of the first electrode  221  and part of the second electrode  222  are removed, whereby a groove structure  210   g  which includes the first portion  210   ga , the second portion  210   gb  and the third portion  210   gc  is formed on the lower surface  200   b  side of the light-emitting structure  200 Ef. That is, in this example, part of the covering member  210 Ef, part of the first electrode  221  and part of the second electrode  222  are removed, whereby the same structure as that of the light-emitting module  200 E shown in  FIG.  9    is formed. 
     By forming the groove structure  210   g , at least part of the first electrode  221  of the first light-emitting element  220 A and at least part of the second electrode  222  of the first light-emitting element  220 A are exposed inside the groove structure  210   g  as schematically shown in  FIG.  17   . In this example, part of the first electrode  221  of the first light-emitting element  220 A is exposed inside the first portion  210   ga  of the groove structure  210   g , and part of the second electrode  222  of the first light-emitting element  220 A is exposed inside the second portion  210   gb  of the groove structure  210   g . Part of the first electrode  221  of the second light-emitting element  220 B is exposed inside the second portion  210   gb  of the groove structure  210   g , and part of the second electrode  222  of the second light-emitting element  220 B is exposed inside the third portion  210   gc  of the groove structure  210   g.    
     As schematically shown in  FIG.  17   , the first bottom surface  21  of the first portion  210   ga  of the groove structure  210   g , the second bottom surface  22  of the second portion  210   gb  and the third bottom surface  23  of the third portion  210   gc  can be uneven surfaces. Each of the first portion  210   ga , the second portion  210   gb  and the third portion  210   gc  of the groove structure  210   g  is formed by, for example, scanning the lower surface  200   b  of the light-emitting structure  200 Ef with the laser light beam LB in a certain direction (i.e., first direction). In this case, the first bottom surface  21 , the second bottom surface  22  and the third bottom surface  23  are surfaces formed by a set of a plurality of first grooves Gr 1  extending in the first direction. The depth of the first portion  210   ga , in other words, the distance Dp 1  from the first bottom surface  21  to the lower surface  200   b  of the light-emitting structure  200 Ef, is for example in the range of not less than 5 μm and not more than 50 μm. Herein, it can be said that the position of the first bottom surface  21  is substantially identical with the position of a plurality of apexes formed between two adjacent first grooves Gr 1 . Likewise, the depth of the second portion  210   gb  of the groove structure  210   g  and the depth of the third portion  210   gc  of the groove structure  210   g  can also be in the range of, for example, not less than 5 μm and not more than 50 μm. 
     As previously described with reference to  FIG.  4   , by further irradiating with laser light, a plurality of first recesses Dc 1  can be formed in the first bottom surface  21  of the first portion  210   ga , the second bottom surface  22  of the second portion  210   gb  and the third bottom surface  23  of the third portion  210   gc  so as to overlap the plurality of first grooves Gr 1 . As previously described, the irradiation pattern of the laser light in formation of the plurality of first recesses Dc 1  is different from that adopted in formation of the first grooves Gr 1 . For example, the plurality of first recesses Dc 1  can be formed by irradiation with the laser light beam LB in the second direction that is different from the first direction while having intervals. 
     The plurality of first recesses Dc 1  are formed so as to overlap the plurality of first grooves Gr 1 , whereby deeper portions are formed in the bottom portion of the groove structure  210 , so that a greater anchoring effect can be achieved. Instead of forming the plurality of first recesses Dc 1  by irradiating with the laser light beam LB in the second direction while having intervals, a plurality of second grooves Gr 2  extending in a direction different from the extending direction of the plurality of first grooves Gr 1  (i.e., first direction) can be formed by further irradiating with laser light so as to overlap the plurality of first grooves Gr 1  as in the example previously described with reference to  FIG.  5   . By forming the plurality of second grooves Gr 2  in addition to the plurality of first grooves Gr 1 , portions which are deeper than the first grooves Gr 1  and the second grooves Gr 2  (i.e., second recesses) are formed at the meeting positions of the first grooves Gr 1  and the second grooves Gr 2 . Thus, improvement in the anchoring effect can be expected as in formation of the plurality of first recesses Dc 1 . 
     When using the light-reflective member  214 Ef in which light absorbing material is dispersed while forming the groove structure  210   g  by laser light scanning, laser light can effectively be absorbed by the light-reflective member  214 Ef so that partial removal of the surface of the light-reflective member  214 Ef can be effectively achieved. For example, part of the light-reflective member  214 Ef can be deeper than the first electrode  221  and the second electrode  222  of the light-emitting element. A typical example of the material which absorbs the laser light is a colorant. For example, when a UV laser whose center wavelength is in the ultraviolet range is used as the laser light source  410 , a filler of titanium dioxide, carbon, barium sulfate, zinc oxide, or the like can be used as the laser light absorbing material by being dispersed in the light-reflective member  214 Ef. When a green laser is used as the laser light source  410 , carbon, nickel oxide, iron oxide (III) or the like can be used for the filler. When an IR laser whose center wavelength is in the infrared range is used, carbon, calcium sulfate, magnesium silicate, aluminum oxide, tungsten oxide complex or the like can be used for the filler. 
     When the light-reflective member  214 Ef is formed of a foamed plastic, the light-reflective member  214 Ef includes cells in which a plurality of pores are formed. Therefore, by partial removal of the light-reflective member  214 Ef from the lower surface  200   b  side of the light-emitting structure  200 Ef, minute recessed and raised portions are naturally formed in the bottom portion of the groove structure  210   g . Thus, improvement in the anchoring effect can be expected. 
     By forming the groove structure  210   g  in the light-emitting structure  200 Ef, the light-reflective member  214 E is formed from the light-reflective member  214 Ef, and the package  210 E shown in  FIG.  9    can be formed. That is, the light-emitting module  200 E which has been previously described with reference to  FIG.  9    is obtained. 
     Wiring Formation Step (C) 
     Subsequently, the inside of the groove structure is filled with an electrically-conductive material, whereby a plurality of wirings are formed (Step S 3  of  FIG.  11   ). Herein, as schematically shown in  FIG.  18   , the groove structure  210   g  is filled with an electrically-conductive paste  350   r  as the electrically-conductive material.  FIG.  18    shows an example where the electrically-conductive paste  350   r  is placed inside the groove structure  210   g  by printing with the use of the squeegee  390 . The electrically-conductive paste  350   r  can be a material formed by dispersing particles of Au, Ag, Cu or the like in a base material such as an epoxy resin. For example, a known Au paste, Ag paste, or Cu paste can be used as the electrically-conductive paste  350   r . The electrically-conductive paste  350   r  can contain a solvent. Instead of the electrically-conductive paste  350   r , for example, an alloy material formed by adding copper powder to a Sn—Bi based solder can be use as the electrically-conductive material. 
     The electrically-conductive paste  350   r  is applied to the inside of the groove structure  210   g  or onto the lower surface  214   b  of the light-reflective member  214 E, and the squeegee  390  is moved across the lower surface  214   b  as illustrate by thick arrow MV in  FIG.  18   . In this step, part of the electrically-conductive paste  350   r  enters the inside of the first grooves Gr 1 . Another part of the electrically-conductive paste  350   r  enters the inside of the first recesses Dc 1  or the second grooves Gr 2 . That is, the inside of the first grooves Gr 1 , the inside of the first recesses Dc 1  and the inside of the second grooves Gr 2  are filled with the electrically-conductive paste  350   r.    
     A bulging part of the electrically-conductive paste  350   r  applied onto the light-reflective member  214 E which is positioned higher level than the lower surface  214   b  is removed by moving the squeegee  390 . By removing the unnecessary part of the electrically-conductive paste  350   r , the surface  350   ra  of the electrically-conductive paste  350   r  can be made substantially coplanar with the lower surface  214   b  of the light-reflective member  214 E. 
     The method of applying the electrically-conductive paste  350   r  to the light-emitting module  200 E is not required to be the method using a squeegee. Application of the electrically-conductive paste  350   r  can be realized by various printing methods, including spin coating, dip coating, screen printing, offset printing, flexo printing, gravure printing, microcontact printing, inkjet printing, nozzle printing, and aerosol jet printing. As a matter of course, the electrically-conductive paste  350   r  can be applied to the light-emitting module  200 E by a method other than printing. 
     Thereafter, the electrically-conductive paste  350   r  placed inside the groove structure  210   g  is cured by heating or light irradiation. By curing the electrically-conductive paste  350   r , a wiring pattern can be formed of the electrically-conductive paste  350   r  such that the wiring pattern has a shape which matches with the shape of the groove structure  210   g  as viewed in the normal direction of the lower surface  100   b  of the light-emitting device as in the example shown in  FIG.  3   . In this example, by curing the electrically-conductive paste  350   r , a first wiring  310  which has a shape matched with the shape of the first portion  210   ga  is formed inside the first portion  210   ga  of the groove structure  210   g , and a second wiring  320  which has a shape matched with the shape of the second portion  210   gb  is formed inside the second portion  210   gb  of the groove structure  210   g . Also, a third wiring  330  which has a shape matched with the shape of the third portion  210   gc  is formed inside the third portion  210   gc . Through the above-described process, the light-emitting device  100 E shown in  FIG.  9    can be manufactured. 
     When necessary, an additional grinding step can be carried out after the electrically-conductive paste  350   r  has been cured. In the example shown in  FIG.  19   , the surface of the cured electrically-conductive paste  350   r  and the lower surface  200 Eb of the light-emitting module  200 E are ground using a grindstone  430 . By grinding, the lower surface  310   b  of the first wiring  310 , the lower surface  320   b  of the second wiring  320  and the lower surface  330   b  of the third wiring  330 , which are the ground surfaces, can be made coplanar with the lower surface  200 Eb of the light-emitting module  200 E. Also, the residue of the electrically-conductive paste  350   r  adhered to the lower surface  200 Eb of the light-emitting module  200 E can be removed. When necessary, a copper plating layer or a nickel-gold plating layer can be formed on the cured electrically-conductive paste  350   r.    
     Because part of the first electrode  221  of the first light-emitting element  220 A is exposed inside the first portion  210   ga , the first wiring  310  is electrically connected with the first electrode  221  of the first light-emitting element  220 A. Likewise, because part of the second electrode  222  of the second light-emitting element  220 B is exposed inside the third portion  210   gc , the third wiring  330  is electrically connected with the second electrode  222  of the second light-emitting element  220 B. In this example, part of the second electrode  222  of the first light-emitting element  220 A and part of the first electrode  221  of the second light-emitting element  220 B are exposed inside the second portion  210   gb . Therefore, the second wiring  320  formed inside the second portion  210   gb  electrically connects the second electrode  222  of the first light-emitting element  220 A and the first electrode  221  of the second light-emitting element  220 B with each other. 
     The second electrode  222  of the first light-emitting element  220 A is, for example, the cathode of the first light-emitting element  220 A. The first electrode  221  of the second light-emitting element  220 B is, for example, the anode of the second light-emitting element  220 B. In this case, the first light-emitting element  220 A and the second light-emitting element  220 B are electrically connected in series by forming the first wiring  310 , the second wiring  320  and the third wiring  330 . Alternatively, when the first electrode  221  of the second light-emitting element  220 B and the second electrode  222  of the first light-emitting element  220 A are cathodes, the cathode electrode of the first light-emitting element  220 A and the cathode electrode of the second light-emitting element  220 B are electrically connected together via the second wiring  320 . In other words; the first light-emitting element  220 A and the second light-emitting element  220 B can be electrically connected in parallel by forming the first wiring  310 , the second wiring  320  and the third wiring  330 . When the first light-emitting element  220 A and the second light-emitting element  220 B are connected in parallel, the first wiring  310  can be short-circuited to the third wiring  330 . 
     Thus, according to the present embodiment, for example, the first wiring  310  connected with the first electrode  221  of the light-emitting element and the second wiring  320  connected with the second electrode  222  of the light-emitting element can be relatively easily formed in the groove structure  210   g . That is, a wiring pattern is included on the light-emitting device side. For example, the light-emitting device can be driven by such a simple connection that a power supply connector is connected to the first wiring  310  and the second wiring  320 . Therefore, the light-emitting device can be driven without the necessity of using a wiring board which has a predetermined wiring pattern. Even when the light-emitting device includes a plurality of light-emitting elements, a light-emitting device which includes wirings for connecting these light-emitting elements can be provided. 
     In the step illustrated in  FIG.  12   , a plurality of multilayer sheets LS can be provided. These sheets can be two-dimensionally arrayed on a support such as a heat-resistant adhesive tape before being subjected to the process illustrated in  FIG.  13   ,  FIG.  14   ,  FIG.  15    and  FIG.  16   . In this case, after the light-reflective resin layer  214 T is formed, the light-reflective resin layer  214 T is cut at a position between two adjacent multilayer sheets LS on the support, whereby plurality of light-emitting modules  200 E can be efficiently produced. In the example shown in  FIG.  16    the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  are covered with the light-reflective member  214 Ef. However, when the structure on the support  300  is cut at a position which includes not only the light-reflective resin layer  214 T but also the protecting member  211  and the wavelength converting member  212 , a light-emitting device can be produced in which the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  are exposed out of the light-reflective member as in the configuration described with reference to  FIG.  7    and  FIG.  8   . 
     Although in the example described with reference to  FIG.  13    two light-emitting elements, the first light-emitting element  220 A and the second light-emitting element  220 B, are placed on the multilayer sheet LS, the number of light-emitting elements placed on the multilayer sheet LS can be appropriately determined. When a single light-emitting element  220  is placed on a single multilayer sheet LS, the light-emitting device  100 A shown in  FIG.  2    is formed. Structures each including a single light-emitting element  220  fixed onto each multilayer sheet LS can be two-dimensionally arrayed on a support, and covered with a single light-reflective resin layer  214 T. For example, the light-emitting device  100 F shown in  FIG.  10    can be produced by cutting into pieces each including two of the structures in which a single light-emitting element  220  is included for each multilayer sheet LS. 
     After a plurality of light-emitting structures are formed in the above-described light-emitting structure providing step (A), the plurality of light-emitting structures can be electrically connected together in the wiring formation step (C). In the example shown in  FIG.  20   , just after a plurality of light-emitting structures  200 Af are formed each of which includes a light-emitting element  220  and a covering member  210 Af covering the light-emitting element  220 , two light-emitting structures  200 Af (i.e., the first and second light-emitting structures) are placed on a support  360  (i.e., a heat-resistant adhesive tape). 
     Each of the light-emitting structures  200 Af is formed, for example, through the process described with reference to  FIG.  12   ,  FIG.  13   ,  FIG.  14   ,  FIG.  15   ,  FIG.  16    and  FIG.  17    such that a single light-emitting element  220  is provided on a single multilayer sheet LS. Each of the light-emitting structures  200 Af has a groove structure  210   g  which includes the first portion  210   ga  and the second portion  210   gb  on the lower surface  200   b  side. The covering member  210 Af of each light-emitting structure  200 Af includes a light-reflective member  214 Af. The light-reflective member  214 Af of the first light-emitting structure  200 Af and the light-reflective member  214 Af of the second light-emitting structure  200 Af are placed on the support  360  with no gap therebetween. The light-reflective members  214 Af of these two light-emitting structures  200 Af can be joined together by an adhesive agent or the like. 
     After the first and second light-emitting structures  200 Af are placed, wirings are formed inside the first portion  210   ga  and the second portion  210   gb  through the same process as that described with reference to  FIG.  18    and  FIG.  19   . Thereby, as shown in  FIG.  21   , a light-emitting device  100 N is obtained in which two light-emitting modules  200 A are connected by the second wiring  320 . 
     In the configuration illustrated in  FIG.  21   , the second wiring  320  is continuously provided inside the second portion  210   gb  of the groove structure  210   g  provided in the light-emitting module  200 A shown in the left side of the drawing and the first portion  210   ga  of the groove structure  210   g  provided in the light-emitting module  200 A shown in the right side of the drawing so as to extend from one to the other. That is, the second wiring  320  electrically connects the second electrode  222  of the light-emitting element  220  of the light-emitting module  200 A shown in the left side of the drawing and the first electrode  221  of the light-emitting element  220  of the light-emitting module  200 A shown in the right side of the drawing. The first wiring  310  is provided in the first portion  210   ga  of the groove structure  210   g  provided in the light-emitting module  200 A shown in the left side of the drawing. The third wiring  330  is provided in the second portion  210   gb  of the groove structure  210   g  provided in the light-emitting module  200 A shown in the right side of the drawing. Therefore, these light-emitting modules  200 A can be driven by connecting the first wiring  310  and the third wiring  330  to an external power supply. 
       FIG.  22    shows an example where six light-emitting modules  200 A are one-dimensionally arrayed, and electrodes of adjacent modules are electrically connected with each other by a second wiring  320 . As illustrated in  FIG.  22   , a bar-like light source can be produced by, for example, one-dimensionally arraying a plurality of light-emitting modules  200 A. As clearly seen from this example, the number of light-emitting modules in which electrical connection is formed by wirings provided in the groove structure  210   g  can be appropriately determined. 
     The electrical connection of the light-emitting elements  220  included in the plurality of light-emitting modules can be serial connection or can be parallel connection. The light-emitting device  100 G shown in  FIG.  23    includes four light-emitting modules which are one-dimensionally arrayed. In the configuration illustrated in  FIG.  23   , the first wiring  310  and the second wiring  320  provided inside the groove structure  210   g  at the lower surface  100   b  respectively electrically connect the first electrode  221  and the second electrode  222  of the light-emitting element included in each light-emitting module.  FIG.  23    shows an example where the light-emitting elements  220  included in the plurality of light-emitting modules are electrically connected in parallel. In this example, the first wiring  310  and the second wiring  320  are used as terminals so that the light-emitting elements  220  included in these light-emitting modules can be simultaneously lit on or off. 
       FIG.  24    shows an example where six light-emitting modules are two-dimensionally arrayed, and the light-emitting elements  220  included in these modules are electrically connected by the first wiring  310 , the second wiring  320  and the third wiring  330  provided in the groove structure  210   g . The light-emitting device  100 H shown in  FIG.  24    has an array of six light-emitting modules in two rows and three columns. In this example, likewise as in the light-emitting device  100 N described with reference to  FIG.  21    and  FIG.  22   , the first electrode  221  of one light-emitting module and the second electrode  222  of another light-emitting module are electrically connected via the second wiring  320 . Therefore, the first wiring  310  and the third wiring  330  can be used as a set of the cathode-side terminal and the anode-side terminal. The six light-emitting modules can be mounted to a wiring board or the like in a relatively easy manner without the necessity of individually mounting the six light-emitting modules. 
     As illustrated in  FIG.  24   , a plurality of light-emitting modules are two-dimensionally arrayed, whereby a large-area emission surface can be realized. Thus, according to the present embodiment, a plurality of light-emitting structures can be electrically connected in a relatively easy manner by the wirings provided inside the groove structure of each light-emitting structure. Therefore, a large-area emission surface can be realized through a simple process. Thus, a plurality of light-emitting structures each having a groove structure  210   g  are one-dimensionally or two-dimensionally arrayed, and then, wirings are formed of an electrically-conductive paste or the like in the groove structure  210   g . In this way, wirings for electrically connecting the light-emitting elements among the plurality of light-emitting modules can be simultaneously formed in an efficient manner. 
     The electrical connection between the light-emitting elements of the plurality of light-emitting modules is not required to be performed by the wirings continuously formed inside the groove structure  210   g  between two adjoining light-emitting modules via. The light-emitting device  100 K shown in  FIG.  25    includes a plurality of light-emitting modules  200 A, a plurality of first wirings  310  and a plurality of second wirings  320 , and a plurality of wires  350 . In the configuration illustrated in  FIG.  25   , the first wiring  310  formed in one light-emitting module  200 A and the second wiring  320  formed in another light-emitting module  200 A which is adjacent to that light-emitting module  200 A are electrically connected to each other by one of the wirings  350 . The arrangement of the plurality of light-emitting modules can be appropriately determined. For example, a plurality of light-emitting modules can be arranged in an annular arrangement and electrically connected to each other. 
     Alternatively, just after a plurality of light-emitting structures are formed, those light-emitting structures can be one-dimensionally or two-dimensionally arrayed, and groove structures can be formed in the lower surfaces of the plurality of light-emitting structures.  FIG.  26    shows a plurality of light-emitting structures  200 Af arrayed on the support  300  with no gap therebetween. Although  FIG.  26    shows an example where two light-emitting structures  200 Af each including a light-reflective member  214 Af are one-dimensionally arrayed in the X-direction for simplicity, the number and arrangement of light-emitting structures  200 Af can be appropriately determined. 
     Subsequently, the above-described groove structure formation step is performed. For example, as schematically shown in  FIG.  27   , the lower surface  200   b  of the light-emitting structures  200 Af is scanned with the laser light beam LB such that the groove structure  210   g  is formed in the lower surface  200   b . In this step, a plurality of first grooves Gr 1  can be formed on the lower surface  200   b  side of the light-emitting structures  200 Af. Likewise as in the above-described example, a plurality of first recesses Dc 1  can be further formed so as to overlap the plurality of first grooves Gr 1 . Alternatively, a plurality of second grooves Gr 2  can be further formed so as to overlap the plurality of first grooves Gr 1  instead of further forming a plurality of first recesses Dc 1 . 
     Subsequent steps can be the same as those described with reference to  FIG.  18    and  FIG.  19   . That is, as schematically shown in  FIG.  28   , for example, an electrically-conductive paste  350   r  is placed in the groove structure  210   g  formed in each of the light-emitting structures  200 Af. Thereafter, the electrically-conductive paste  350   r  is cured. When necessary, the grinding step which has previously been described with reference to  FIG.  19    can further be carried out thereafter. Through the process described hereinabove, the same structure as that of the light-emitting device  100 N shown in  FIG.  21    is formed on the support  300 . When a plurality of light-emitting structures are arrayed prior to formation of the groove structure  210   g  as in this example, groove structures  210   g  can be formed simultaneously in the plurality of light-emitting structures, and wirings matched with the shape of the groove structures  210   g  can be efficiently formed. 
     Second Embodiment 
       FIG.  29    shows a cross section of an exemplary light-emitting device of the second embodiment of the present disclosure.  FIG.  29    schematically shows a cross section of the light-emitting device  100 L of the second embodiment of the present disclosure taken along a plane perpendicular to the upper surface  100   a  in the center or its vicinity of the light-emitting device  100 L. The external appearance of the light-emitting device  100 L as viewed from the upper surface  100   a  side can be the same as that of the light-emitting device  100 A shown in  FIG.  1    and, therefore, illustration thereof is herein omitted. 
     As schematically shown in  FIG.  29   , the light-emitting device  100 L generally includes a light-emitting module  200 L, and a first wiring  310  and a second wiring  320 . The light-emitting module  200 L includes a light-emitting element  220 . The present embodiment is substantially equal to the first embodiment in that the light-emitting module  200 L has a groove structure  210   h  on the lower surface side which is opposite to the upper surface  100   a  of the light-emitting device  100 L, and the first wiring  310  and the second wiring  320  are provided inside the groove structure  210   h . Also in the example shown in  FIG.  29   , the groove structure  210   h  includes two portions, the first portion  210   ha  and the second portion  210   hb . The first wiring  310  is present inside the first portion  210   ha  of the groove structure  210   h , and is connected with part of the first electrode  221  of the light-emitting element  220  which is exposed to an inside of the first portion  210   ha . The second wiring  320  is present inside the second portion  210   hb  of the groove structure  210   h , and is connected with part of the second electrode  222  of the light-emitting element  220  which is exposed to an inside of the second portion  210   hb.    
     As does the light-emitting device of the first embodiment, the light-emitting module  200 L includes a package  210 L which covers the light-emitting element  220 . Herein, the package  210 L includes a covering member  210 Af and a resin layer  230 . The covering member  210 Af includes a protecting member  211 , a wavelength converting member  212 , a light guiding member  213 , and a light-reflective member  214 Af. The number of light-emitting elements covered with the package  210 L is not required to be one but can be two or more. 
     Covering Member  210 Af 
     As schematically shown in  FIG.  29   , the covering member  210 Af covers the light-emitting element  220  except for part of the lower surface  221   b  of the first electrode  221  of the light-emitting element  220  and part of the lower surface  222   b  of the second electrode  222  of the light-emitting element  220 . It can be said that the covering member  210 Af is substantially equal to the covering member  210 Af shown in  FIG.  26   . As illustrated in the drawing, in this example, part of the lower surface  221   b  of the first electrode  221  is exposed inside the first portion  210   ha  of the groove structure  210   h . The position of the first bottom surface  21  of the first portion  210   ha  is substantially the same height as the position of the lower surface  221   b  of the first electrode  221  in the Z direction as seen in this cross-sectional view. Likewise, in this example, part of the lower surface  222   b  of the second electrode  222  is exposed inside the second portion  210   hb  of the groove structure  210   h , and the position of the second bottom surface  22  of the second portion  210   hb  is substantially the same height as the position of the lower surface  222   b  of the second electrode  222  in the Z direction as seen in this cross-sectional view. 
     In the example shown in  FIG.  29   , the first bottom surface  21  of the first portion  210   ha  and the second bottom surface  22  of the second portion  210   hb  are substantially flat surfaces. However, the shape of the bottom portion of the groove structure  210   h  is not required to be a flat surface. The first bottom surface  21  and the second bottom surface  22  can have surface unevenness likewise as in the example previously described with reference to, for example,  FIG.  2   . For example, the first bottom surface  21  and the second bottom surface  22  can be formed by a set of a plurality of first grooves Gr 1 . A plurality of first recesses Dc 1  and/or a plurality of second grooves Gr 2  can be formed so as to overlap the plurality of first grooves Gr 1 . Various configurations described in this specification can be used in arbitrary combinations so long as no technical inconsistency occurs. 
     The light-reflective member  214 Af in the covering member  210 Af surrounds the light-emitting element  220  and, in this example, covers the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212 . As a matter of course, such a configuration is also possible that the lateral surfaces  211   c  of the protecting member  211  and the lateral surfaces  212   c  of the wavelength converting member  212  are exposed out of the light-reflective member as in the example shown in  FIG.  8   . 
     Resin Layer  230   
     The resin layer  230  is provided on the lower surface  210 Ab of the covering member  210 Af, in other words, on the lower surface side of the package  210 L at which the groove structure  210   h  is provided, and has openings in part thereof.  FIG.  30    shows an example of the external appearance of the light-emitting device  100 L shown in  FIG.  29    as viewed from the lower surface  100   b  side that is opposite to the upper surface  100   a . As seen from  FIG.  29    and  FIG.  30   , the first wiring  310  and the second wiring  320  occupy the inner space of the openings of the resin layer  230 . That is, in the present embodiment, it can be said that the groove structure  210   h  of the light-emitting module  200 L has a planar shape defined by the openings formed in the resin layer  230 . As a matter of course, the shape of the groove structure  210   h  shown in  FIG.  30    is merely exemplary. The shape of the groove structure  210   h  as viewed from the bottom does not have particular requirement so long as it overlaps part of the first electrode  221  of the light-emitting element and part of the second electrode  222  of the light-emitting element. 
     The resin layer  230  can be a layer formed by curing an adhesive agent. The adhesive agent used can be, a known thermoplastic or thermosetting material, for example, a thermoplastic resin, a thermosetting resin, or a synthetic elastomer. The material of the resin layer  230  can be a copolymer of acrylonitrile and 1,3-butadiene (also referred to as NBR) or an epoxy resin. An epoxy resin to which NBR or an acrylic resin is added can be used as the material of the resin layer  230 . 
     Also in the present embodiment, a set of the first wiring  310  and the second wiring  320  can serve as a set of the anode and cathode of the light-emitting device  100 L likewise as in the first embodiment. That is, the light-emitting device  100 L can be driven by connecting a driver, a power supply circuit, etc., to the first wiring  310  and the second wiring  320 . Particularly when the resin layer  230  is an adhesive layer, the light-emitting device  100 L can be temporarily attached to a wiring board or the like using the adhesive layer, and mounting can be carried out more easily. 
     Manufacturing Method of Light-Emitting Device 
     Hereinafter, a light-emitting device manufacturing method of the second embodiment of the present disclosure is described with reference to the drawings.  FIG.  31    illustrates the outline of the light-emitting device manufacturing method of the second embodiment of the present disclosure. The light-emitting device manufacturing method illustrated in  FIG.  31    includes: providing a light-emitting structure, the light-emitting structure including a light-emitting element which includes the first electrode and the second electrode and a covering member which covers the light-emitting element (Step S 11 ); placing a mask having a sheet shape above the lower surface of the electrodes of the light-emitting element (Step S 12 ); irradiating with laser light to remove at least part of the mask such that at least part of the first electrode and at least part of the second electrode are exposed (Step S 13 ); and forming a plurality of wirings by filling a portion from which the mask has been removed with an electrically-conductive material (Step S 14 ). According to the manufacturing method described herein, a plurality of light-emitting structures are formed each of which includes a light-emitting element and a covering member that covers the light-emitting element, and a light-emitting device which includes a plurality of light-emitting modules is formed from these light-emitting structures. 
     Light-Emitting Structure Providing Step (A′) 
     First, a plurality of light-emitting structures  200 Af are provided each of which includes a light-emitting element  220  and a covering member  210 Af that covers the light-emitting element  220  (Step S 11  of  FIG.  31   ). Herein, likewise as in the example previously described with reference to  FIG.  26   , the plurality of light-emitting structures  200 Af are arranged on a support  300  such as a heat-resistant adhesive tape. At the stage of providing the plurality of light-emitting structures  200 Af, typically, the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  of each light-emitting element  220  are exposed out of the light-reflective member  214 Af. 
     Mask Placing Step (B′) 
     Subsequently, a mask is placed above the lower surfaces of the electrodes of the light-emitting element (Step S 12  of  FIG.  31   ). For example, as shown in  FIG.  32   , a mask  230 M having a sheet shape is placed on the light-emitting structures  200 Af so as to cover the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222  of the light-emitting element  220 . Herein, a multilayer sheet which includes a supporting layer  230   s  and an adhesive layer  230   a  is used as the mask  230 M. This multilayer sheet is attached to the light-emitting structures  200 Af such that the adhesive layer  230   a  faces the lower surface  200   b  of the light-emitting structures  200 Af. The supporting layer  230   s  is, for example, a sheet of polyethylene terephthalate. The adhesive layer  230   a  is, for example, a layer of an epoxy-based adhesive agent to which a nitrile rubber is added. The adhesive layer  230   a  has a thickness in the range of not less than about 5 μm and not more than about 50 μm. After the mask  230 M is attached, the material of the adhesive layer  230   a  is cured by heating etc. when necessary. In the example illustrated in  FIG.  32   , two light-emitting structures  200 Af are arranged in the X-direction with no gap therebetween on the support  300  to show the structure without excessive complication. However, the number of light-emitting structures  200 Af can be three or more. The arrangement of the light-emitting structures  200 Af is not required to be a one-dimensional array, but can be a two-dimensional array. 
     Irradiation Step (C′) 
     Subsequently, the mask is partially removed by laser light irradiation. In this step, part of each electrode of the light-emitting element is exposed by removing the mask (Step S 13  of  FIG.  31   ). For example, a laser ablation apparatus  400  is used to irradiate the lower surface  200   b  of the light-emitting structures  200 Af with a laser light beam LB from the supporting layer  230   s  side of the mask  230 M via the mask  230 M as schematically shown in  FIG.  33   . Thereby, part of the mask  230 M is removed, whereby part of the lower surface  221   b  of the first electrode  221  and part of the lower surface  222   b  of the second electrode  222  in each the light-emitting element  220  are exposed out of the mask  230 M. 
       FIG.  34    schematically shows a resultant structure after part of the mask  230 M is removed by laser light irradiation. As shown in  FIG.  34   , part of the lower surface  200   b  of the light-emitting structures  200 Af is exposed at openings formed in the mask  230 M by partial removal of the mask  230 M. Part of the lower surface  200   b  of the light-emitting structures  200 Af which is exposed out of the mask  230 M includes part of the lower surface  221   b  of the first electrode  221  and part of the lower surface  222   b  of the second electrode  222  of the light-emitting element  220 , and part of the lower surface  214   b  of the light-reflective member  214 Af. 
     In this irradiation step (C′), part of the first electrode  221  and part of the second electrode  222  of the light-emitting element  220  can be removed by laser light irradiation as in the first embodiment. Part of the lower surface  214   b  of the light-reflective member  214 Af can be removed by laser light irradiation. In this case, the lower surface  214   b  of the light-reflective member  214 Af, the lower surface  221   b  of the first electrode  221 , and the lower surface  222   b  of the second electrode  222  can have an uneven shape. For example, in the same manner as in the example previously described with reference to  FIG.  27   , partial removal of the mask  230 M and formation of the plurality of first grooves Gr 1  can be performed by laser light irradiation. After the partial removal of the mask  230 M, part of the lower surface  200   b  of the light-emitting structures  200 Af which is exposed out of the mask  230 M can be further irradiated with laser, light such that a plurality of first recesses Dc 1  are further formed so as to overlap the plurality of first grooves Gr 1 , or a plurality of second grooves Gr 2  are further formed so as to overlap the plurality of first grooves Gr 1 . 
     Wiring Formation Step (D′) 
     Subsequently, the portions from which the mask has been removed are filled with an electrically-conductive material, whereby a plurality of wirings are formed (Step S 14  of  FIG.  31   ). A specific wiring formation method can be substantially the same as that in the wiring formation step (C) of the first embodiment. Specifically, an electrically-conductive paste  350   r  as the electrically-conductive material is placed on part of the lower surface  200   b  of the light-emitting structures  200 Af which is exposed out of the mask  230 M and/or on the remaining part of the mask  230 M which has not been removed by laser light irradiation. Thereafter, the squeegee  390  is moved at the level of the surface of the mask  230 M as illustrate by thick arrow MV in  FIG.  35   . As a matter of course, the method of electrically-conductive material filling to portions of the structure on the support  300  from which the mask  230 M has been removed is not required to be printed with the use of the squeegee  390  but can be formed using any other appropriate method. 
     Thereafter, the electrically-conductive paste  350   r  filling the openings of the mask  230 M is cured. By curing the electrically-conductive paste  350   r , a plurality of wirings which have shapes matched with the shapes of the openings of the mask  230 M can be formed inside the openings of the mask  230 M. In the configuration illustrated in  FIG.  36   , the first wiring  310 , the second wiring  320  and the third wiring  330  are formed of the electrically-conductive paste  350   r  in the openings of the mask  230 M. As illustrated in the drawing, the first wiring  310  is in contact with the first electrode  221  of the light-emitting element  220  of the light-emitting structure  200 Af shown in the left side of the drawing, and is electrically connected with the first electrode  221 . The third wiring  330  is in contact with the second electrode  222  of the light-emitting element  220  of the light-emitting structure  200 Af shown in the right side of the drawing, and is electrically connected with the second electrode  222 . The second wiring  320  is in contact with the second electrode  222  of the light-emitting element  220  of the light-emitting structure  200 Af shown in the left side of the drawing and with the first electrode  221  of the light-emitting element  220  of the light-emitting structure  200 Af shown in the right side of the drawing and electrically connects these electrodes with each other. 
     When necessary, part of the remainder of the mask  230 M corresponding to the supporting layer  230   s  is removed. By peeling off the part corresponding to the supporting layer  230   s  by for example a mechanical method, the part corresponding to the supporting layer  230   s  can be selectively removed while part of the remainder of the mask  230 M corresponding to the adhesive layer  230   a  remains on the light-emitting structures  200 Af. After the plurality of wirings are formed, a portion corresponding to the supporting layer  230   s  is removed from the region above the light-emitting structure  200 Af, resulting in a package  210 L which includes the resin layer  230  and the covering member  210 Af as schematically shown in  FIG.  37   . Part of the remainder of the mask  230 M corresponding to the adhesive layer  230   a  corresponds to the resin layer  230  in the package  210 L. 
     By removing part of the remainder of the mask  230 M corresponding to the supporting layer  230   s , a groove structure  210   h  defined by the openings formed in the resin layer  230  is formed on the side opposite to the protecting member  211  of the covering member  210 Af in the Z direction of the light-emitting structure  200 Af. As shown in  FIG.  37   , the groove structure  210   h  includes a first portion  210   ha  in which part of the first electrode  221  is exposed and a second portion  210   hb  in which part of the second electrode  222  is exposed. In this example, the second wiring  320  is continuously provided from the second portion  210   hb  formed in the package  210 L shown in the left side of the drawing to the first portion  210   ha  formed in the package  210 L shown in the right side of the drawing. That is, it can be said that two light-emitting modules on the support  300  are electrically connected with each other via the second wiring  320 . 
     By removing the part corresponding to the supporting layer  230   s , residue of debris scattered and adhered onto the mask  230 M in the above-described irradiation step (C′) and residue of the electrically-conductive paste  350   r  cured on the mask  230 M in the wiring formation step (D′) can be removed together with the supporting layer  230   s . That is, remaining of debris or the like on the lower surface of the light-emitting device can be avoided. As described above, the light-emitting device can be temporarily attached to a mounting board, or the like, using part of the remainder of the mask  230 M corresponding to the adhesive layer  230   a.    
     After the part corresponding to the supporting layer  230   s  is removed, part of the first electrode  221  and part of the second electrode  222  can be removed by grinding. In the example shown in  FIG.  38   , the surface of the first wiring  310 , the second wiring  320  and the third wiring  330  is ground using the grindstone  430 . By performing such a grinding step, the position of the lower surface  310   b  of the first wiring  310 , the position of the lower surface  320   b  of the second wiring  320 , and the position of the lower surface  330   b  of the third wiring  330  can be adjusted to the position of the surface of the resin layer  230 . The adhesive layer  230   a  of the mask  230 M has a thickness of, for example, not less than 5 μm and not more than 50 μm. After the grinding step has been performed, the thickness of the first wiring  310 , the second wiring  320  and the third wiring  330  can be, approximately, in the range of not less than about 5 μm and not more than about 50 μm. When necessary, a copper plating layer or a nickel-gold plating layer can be formed on the surfaces of the first wiring  310 , the second wiring  320  and the third wiring  330 . 
     Through the above-described process, a light-emitting device  100 M is realized in which two light-emitting modules  200 L shown in  FIG.  29    are continued. The electrical connection between the light-emitting elements  220  of the two light-emitting modules  200 L can be serial connection or can be parallel connection. 
       FIG.  39    schematically shows a resultant structure after the light-emitting device  100 M shown in  FIG.  38    is mounted to a wiring board. As shown in  FIG.  39   , a bonding material  520 , such as solder, electrically-conductive paste, or the like, is placed on the wiring pattern  510  of a wiring board  500 , such as glass epoxy substrate, whereby the light-emitting device  100 M can be mounted to the wiring board  500  via the bonding material  520 . Also in the present embodiment, wirings are included in the light-emitting device side, and therefore, it is not necessary to use a wiring board which has complicated wiring patterns, and mounting of a light-emitting device to a wiring board is easy, as in the first embodiment. Further, formation of the first wiring  310 , the second wiring  320  and the third wiring  330  on the light-emitting device side does not need photolithography or etching. Thus, these wirings can be formed on the lower surface side of the light-emitting device through a simple process. 
     As in the examples previously described with reference to  FIG.  32   ,  FIG.  33   ,  FIG.  34   ,  FIG.  35   ,  FIG.  36   ,  FIG.  37   ,  FIG.  38    and  FIG.  39   , one-dimensional or two-dimensional array of a plurality of light-emitting structures is formed, and a plurality of wirings including the first wiring  310  and the second wiring  320  are formed. With this structure, a large-area emission surface can be formed through a simple process. Particularly a single mask  230 M can be placed on one-dimensionally or two-dimensionally arrayed light-emitting structures so as to cover all the light-emitting structures, whereby a groove structure extending across plurality of light-emitting modules can be efficiently formed. As a matter of course, a plurality of light-emitting structures each including the first light-emitting element  220 A and the second light-emitting element  220 B such as shown in  FIG.  16    can be provided, and the above-described mask placing step (B′), irradiation step (C′) and wiring formation step (D′) can be performed on these light-emitting structures. In such a process, a wiring which electrically connects the first light-emitting element  220 A and the second light-emitting element  220 B in series or in parallel can be formed in the wiring formation step (D′). A light-emitting device can be provided which has wirings for connecting a plurality of light-emitting elements. 
     EXAMPLES 
     Hereinafter, examples of a light-emitting device of an embodiment of the present disclosure will be described in more detail. As a matter of course, the embodiment of the present disclosure is not required to be forms specified by the following examples. 
     Evaluation 1 of Shape of Bottom Portion of Groove Structure 
     A plurality of samples were prepared in which, by scanning a white resin plate with a laser light beam, a groove structure was formed in one of the primary surfaces of the resin plate, and a bottom portion of the groove structure was further irradiated with laser light in a different irradiation pattern. These samples were evaluated as to the shape of the bottom portion of the groove structure. 
     Example 1-1 
     First, a resin plate was provided in which particles of titanium dioxide were dispersed in a silicone resin that is a base material. Then, one of the primary surfaces of this resin plate was scanned with a laser light beam in a certain direction (first direction) such that a plurality of first grooves each extending in the first direction were formed in the resin plate (corresponding to the previously-described groove structure formation step). Herein, scanning with the laser light beam was carried out in five different regions of the primary surface of the resin plate, whereby a groove structure was formed in the resin plate such that the groove structure included five portions each having a bottom surface defined by a set of a plurality of first grooves. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 2.4 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Pitch of the first grooves: 15 μm or 30 μm. 
     Then, from the five portions included in the groove structure, a portion in which the pitch of the first grooves was 15 μm was selected at random, scanning with a laser light beam was carried out in the second direction that meets the first direction, and the bottom portion of the selected portion (hereinafter, referred to as “first portion”) was irradiated with a laser light beam. Thereby, a plurality of first recesses in the dot shapes were formed in the bottom portion of the first portion likewise as in the examples described with reference to  FIG.  4   . This was the sample of Example 1-1. Herein, a direction selected as the second direction was perpendicular to the first direction. When viewed from the top, each of the first recesses had a diameter of about 0.1 mm. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 2.4 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Distance between the centers of the first recesses: 15 μm. 
       FIG.  40    is a microscopic image enlargedly showing the bottom surface of the groove structure of the sample of Example 1-1.  FIG.  41    shows a cross-sectional profile of the sample of Example 1-1 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line XLI-XLI of  FIG.  40   . In  FIG.  41   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. As shown in  FIG.  40   , herein, the bottom portion of the first portion has three first recesses aligned in the horizontal direction of the drawing sheet. In the cross-sectional profile shown in  FIG.  41   , the average depth of the three first recesses was about 120 μm. 
     Example 1-2 
     From the five portions included in the groove structure, another portion in which the pitch of the first grooves was 15 μm was selected at random, and the bottom portion of the portion selected herein (hereinafter, referred to as “second portion”) was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 1-1 except that the laser power was 1.2 W and the frequency was changed such that the distance between the centers of the first recesses was 60 μm. Thereby, a plurality of first recesses in the dot shapes were formed in the bottom portion of the second portion. This was the sample of Example 1-2. 
       FIG.  42    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 1-2.  FIG.  43    shows a cross-sectional profile of the sample of Example 1-2 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line XLIII-XLIII of  FIG.  42   . In  FIG.  43   , likewise as in  FIG.  41   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Although it is difficult to confirm from  FIG.  42   , the bottom portion has three first recesses aligned along the XLIII-XLIII line likewise as in the example shown in  FIG.  40   . In the cross-sectional profile shown in  FIG.  43   , the average depth of the three first recesses was about 50 μm. 
     Example 1-3 
     From the five portions included in the groove structure, a portion in which the pitch of the first grooves was 30 μm was selected at random, and the bottom portion of the portion selected herein (hereinafter, referred to as “third portion”) was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 1-2 except that the frequency was changed such that the distance between the centers of the first recesses was 30 μm. Thereby, a plurality of first recesses in the dot shapes were formed in the bottom portion of the third portion. This was the sample of Example 1-3. 
       FIG.  44    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 1-3.  FIG.  45    shows a cross-sectional profile of the sample of Example 1-3 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line XLV-XLV of  FIG.  44   . In  FIG.  45   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Although it is difficult to confirm from  FIG.  44   , also in this example, the bottom portion has three first recesses aligned along the XLV-XLV line likewise as in the examples shown in  FIG.  40    and  FIG.  42   . In the cross-sectional profile shown in  FIG.  45   , the average depth of the three first recesses was about 40 μm. 
     Example 1-4 
     From the five portions included in the groove structure, another portion in which the pitch of the first grooves was 30 μm was selected at random, and the bottom portion of the portion selected herein (hereinafter, referred to as “fourth portion”) was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 1-3 except that the frequency was changed such that the distance between the centers of the first recesses was 60 μm. Thereby, a plurality of first recesses in the dot shapes were formed in the bottom portion of the fourth portion. This was the sample of Example 1-4. 
       FIG.  46    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 1-4.  FIG.  47    shows a cross-sectional profile of the sample of Example 1-4 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line XLVII-XLVII of  FIG.  46   . In  FIG.  47   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Although it is difficult to confirm from  FIG.  46   , also in this example, the bottom portion has three first recesses aligned along the XLVII-XLVII line likewise as in the examples shown in  FIG.  40   ,  FIG.  42    and  FIG.  44   . In the cross-sectional profile shown in  FIG.  47   , the average depth of the three first recesses was about 38 μm. 
     Reference Example 1-1 
     The bottom portion of the remaining one of the five portions included in the groove structure (hereinafter, referred to as “fifth portion”) was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 1-2 except that the operation speed was changed to 500 mm/s. Thereby, a plurality of first recesses in the dot shapes were formed in the bottom portion of the fifth portion. This was the sample of Reference Example 1-1. 
       FIG.  48    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Reference Example 1-1.  FIG.  49    shows a cross-sectional profile of the sample of Reference Example 1-1 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line XLIX-XLIX of  FIG.  48   . In  FIG.  49   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Although it is difficult to confirm from  FIG.  48   , also in this example, the bottom portion has three first recesses aligned along the XLIX-XLIX line likewise as in the examples shown in  FIG.  40   ,  FIG.  42   ,  FIG.  44    and  FIG.  46   . In the cross-sectional profile shown in  FIG.  49   , the average depth of the three first recesses was about 22 μm. 
     It was found from the cross-sectional profiles of the samples of Example 1-1 to Example 1-4 ( FIG.  41   ,  FIG.  43   ,  FIG.  45    and  FIG.  47   ) and the cross-sectional profile of the sample of Reference Example 1-1 ( FIG.  49   ) that a plurality of apexes formed between two adjoining first grooves were at a position lower than the surface of the resin plate before formation of the groove structure. That is, in these samples, the position of, the bottom surface of the groove structure is lower than the surface of the resin plate before formation of the groove structure. Therefore, when the electrically-conductive material is placed inside the groove structure, the electrically-conductive material is in contact not only with the bottom portion of the groove structure but also with the lateral surfaces of the groove structure which are present between the bottom portion and the surface of the resin plate, so that achievement of the anchoring effect at the interfaces between the lateral surfaces of the groove structure and the electrically-conductive material can be expected. 
     As seen from the comparison between the cross-sectional profiles of the samples of Example 1-1 to Example 1-4 and the cross-sectional profile of the sample of Reference Example 1-1, the recessed and raised portions formed in the region irradiated with the laser light in the sample of Reference Example 1-1 are not so large. That is, it is advantageous that the operation speed is not excessively high from the viewpoint of forming first recesses of an appropriate depth in the bottom surface which has a plurality of first grooves in the groove structure formation step. It was also found from the comparison between the cross-sectional profile of the sample of Example 1-1 and the cross-sectional profiles of the samples of Example 1-2 to Example 1-4 that, if at equal operation speeds, recessed and raised portions of finer shapes are more readily formed when the laser power is restricted within a certain range. 
     Evaluation 1 of Shape of Wirings 
     Next, the groove structure was filled with an electrically-conductive paste, and the electrically-conductive paste was cured, whereby the wirings were formed in the groove structure (corresponding to the previously-described wiring formation step). It was checked by cross-sectional observation whether or not the wirings had a shape following the shape of the bottom portion of the groove structure. 
     Example 1-5 
     Through the following procedure, the second portion of the sample of Example 1-2 was filled with an electrically-conductive paste, and the electrically-conductive paste was cured, whereby the sample of Example 1-5 was produced. Herein, firstly, the second portion was filled with an electrically-conductive paste by printing with the use of a squeegee and, thereafter, the resin plate filled with an electrically-conductive paste was placed in a 130° C. environment for 30 minutes such that the electrically-conductive paste was cured, whereby a wiring was formed inside the second portion. 
       FIG.  50    is a microscopic image showing the second portion before being filled with an electrically-conductive paste. A plurality of first grooves running in a diagonal direction in the drawing sheet and a plurality of first recesses can be seen.  FIG.  51    shows a cross section after the second portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. In the following description, the diagram for the cross section after the electrically-conductive paste was cured shows a cross section formed by cutting the range of about 4 mm square. 
     Example 1-6 
     The sample of Example 1-6 was produced likewise as the sample of Example 1-5 except that the third portion of the sample of Example 1-3 was filled with an electrically-conductive paste.  FIG.  52    is a microscopic image showing the third portion before being filled with an electrically-conductive paste.  FIG.  53    shows a cross section after the third portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
     Example 1-7 
     The sample of Example 1-7 was produced likewise as the sample of Example 1-5 except that the fourth portion of the sample of Example 1-4 was filled with an electrically-conductive paste.  FIG.  54    is a microscopic image showing the fourth portion before being filled with an electrically-conductive paste.  FIG.  55    shows a cross section after the fourth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. 
     It was found from the cross-sectional images of the samples of Example 1-5 to Example 1-7 ( FIG.  51   ,  FIG.  53    and  FIG.  55   ) that, in each of the samples, part of the wiring was present inside the first grooves and the first recesses. Specifically, the wiring closely followed the shape of the bottom portion of the groove structure, and no void occurred between the wiring and the bottom portion of the groove structure. 
     Evaluation 2 of Shape of Bottom Portion of Groove Structure 
     A plurality of samples which further had a plurality of second grooves each extending in the second direction in the bottom portion of the groove structure were prepared by irradiating the bottom portion of the groove structure with laser light by scanning with a laser light beam in the second direction that is different from the first direction instead of forming a plurality of first recesses in the dot shapes in the groove structure formation step. These samples were evaluated as to the shape of the bottom portion of the groove structure. 
     Example 2-1 
     First, a groove structure was formed in a resin plate, likewise as in production of the sample of Example 1-1 described above, so as to include five portions each having a bottom surface defined by a set of a plurality of first grooves. Note that, however, herein, the laser light irradiation conditions were appropriately changed such that the pitch of the first grooves was 50 μm. Hereinafter, these five portions are referred to as “sixth portion”, “seventh portion”, “eighth portion”, “ninth portion” and “tenth portion”. 
     Then, the bottom portion of the sixth portion of the groove structure was irradiated with a laser light beam by scanning with the laser light beam in the second direction that met the first direction. Thereby, likewise as in the example shown in  FIG.  5   , a plurality of second grooves each extending in the second direction were formed in the bottom portion of the sixth portion so as to overlap the first grooves. This was the sample of Example 2-1. Herein, also, a direction selected as the second direction was perpendicular to the first direction. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 2.4 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Pitch of the second grooves: 50 μm. 
       FIG.  56    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 2-1.  FIG.  57    shows a cross-sectional profile of the sample of Example 2-1 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line LVII-LVII of  FIG.  56   . In  FIG.  57   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. As shown in  FIG.  57   , herein, the bottom portion of the sixth portion has eight first recesses aligned in the horizontal direction of the drawing sheet. In the cross-sectional profile shown in  FIG.  57   , the average depth of the eight first recesses was about 50 μm. 
     Example 2-2 
     The bottom portion of the seventh portion of the groove structure was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 2-1 except that the laser power was 1.2 W. Thereby, a plurality of second grooves each extending in the second direction were formed in the bottom portion of the seventh portion so as to overlap the first grooves. This was the sample of Example 2-2. 
       FIG.  58    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 2-2.  FIG.  59    shows a cross-sectional profile of the sample of Example 2-2 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line LIX-LIX of  FIG.  58   . In  FIG.  59   , likewise as in  FIG.  57   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Also in this example, likewise as in the example shown in  FIG.  57   , the bottom portion has eight first recesses aligned along line LIX-LIX. In the cross-sectional profile shown in  FIG.  59   , the average depth of the eight first recesses was about 35 μm. 
     Example 2-3 
     The bottom portion of the eighth portion of the groove structure was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 2-1 except that the laser power was 1.6 W. Thereby, a plurality of second grooves each extending in the second direction were formed in the bottom portion of the eighth portion so as to overlap the first grooves. This was the sample of Example 2-3. 
       FIG.  60    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 2-3.  FIG.  61    shows a cross-sectional profile of the sample of Example 2-3 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line LXI-LXI of  FIG.  60   . In  FIG.  61   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Also in this example, likewise as in the examples shown in  FIG.  57    and  FIG.  59   , the bottom portion has eight first recesses aligned along line LXI-LXI. In the cross-sectional profile shown in  FIG.  61   , the average depth of the eight first recesses was about 37 μm. 
     Example 2-4 
     The bottom portion of the ninth portion of the groove structure was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 2-1 except that the laser power was 2 W. Thereby, a plurality of second grooves each extending in the second direction were formed in the bottom portion of the ninth portion so as to overlap the first grooves. This was the sample of Example 2-4. 
       FIG.  62    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 2-4.  FIG.  63    shows a cross-sectional profile of the sample of Example 2-4 which was obtained by a laser microscope and which corresponds to a cross-sectional view taken along line LXIII-LXIII of  FIG.  62   . In  FIG.  63   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Also in this example, likewise as in the examples shown in  FIG.  57   ,  FIG.  59    and  FIG.  61   , the bottom portion has eight first recesses aligned along line LXIII-LXIII. In the cross-sectional profile shown in  FIG.  63   , the average depth of the eight first recesses was about 42 μm. 
     Reference Example 2-1 
     The bottom portion of the tenth portion of the groove structure was irradiated with a laser light beam under the same laser light irradiation conditions as those for Example 2-1 except that the operation speed was 500 mm/s. Thereby, a plurality of second grooves each extending in the second direction were formed in the bottom portion of the tenth portion so as to overlap the first grooves. This was the sample of Reference Example 2-1. 
       FIG.  64    shows a cross-sectional profile of the sample of Reference Example 2-1 which was obtained by a laser microscope. In  FIG.  64   , the horizontal dot-chain line represents the position of the surface of the resin plate before formation of the groove structure. Also in this example, likewise as in the examples shown in  FIG.  57   ,  FIG.  59   ,  FIG.  61    and  FIG.  63   , it was confirmed in a cross-sectional view that eight first recesses were formed. In the cross-sectional profile shown in  FIG.  64   , the average depth of the eight first recesses was about 30 μm. 
     It was found from the cross-sectional profiles of the samples of Example 2-1 to Example 2-4 ( FIG.  57   ,  FIG.  59   ,  FIG.  61    and  FIG.  63   ) that a plurality of apexes formed between two adjoining first grooves were at a position lower than the surface of the resin plate before formation of the groove structure also in these samples likewise as in the samples of Example 1-1 to Example 1-4 and Reference Example 1-1. Therefore, also in these samples, achievement of the anchoring effect at the interfaces between the lateral surfaces of the groove structure and the electrically-conductive material can be expected. 
     In comparison, as seen from the cross-sectional profile of the sample of Reference Example 2-1 ( FIG.  64   ), the position of the bottom surface of the groove structure in the sample of Reference Example 2-1 is generally identical with the position of the surface of the resin plate before formation of the groove structure. This means that forming a wiring of a large aspect ratio is relatively difficult. In consideration of this, it can be said that the operation speed is preferably not excessively high from the viewpoint of placing the electrically-conductive material inside the groove structure and forming a wiring of the electrically-conductive material. 
     Evaluation 2 of Shape of Wirings 
     Next, also as for the configuration in which a plurality of first grooves and a plurality of second grooves were provided in the bottom portion of the groove structure, it was checked whether or not the wirings had a shape following the shape of the bottom portion of the groove structure. 
     Example 2-5 
     Likewise as in the sample of Example 1-5, the sixth portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Example 2-5 was produced which had a wiring formed of the electrically-conductive paste inside the sixth portion. 
       FIG.  65    is a microscopic image showing the sixth portion before being filled with an electrically-conductive paste. In  FIG.  65   , seemingly, a plurality of grooves of a zig-zag shape are provided in the bottom portion of the groove structure although in actuality formation of a plurality of first grooves by scanning with a laser light beam along the first direction and formation of a plurality of second grooves by scanning with a laser light beam along the second direction were sequentially performed. In  FIG.  65   , a double-headed arrow d 1  and a double-headed arrow d 2  represent the first direction and the second direction, respectively.  FIG.  66    shows a cross section after the sixth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. In  FIG.  66   , a white broken line represents an approximate position of the bottom surface of the groove structure. 
     Example 2-6 
     The sample of Example 2-6 was produced in the same way as the sample of Example 2-5 except that the eighth portion of the sample of Example 2-3 was filled with an electrically-conductive paste.  FIG.  67    is a microscopic image showing the eighth portion before being filled with an electrically-conductive paste. The sample of Example 2-6 was equal to the sample of Example 2-5 in that formation of a plurality of first grooves by scanning with a laser light beam along the first direction and formation of a plurality of second grooves by scanning with a laser light beam along the second direction were sequentially performed.  FIG.  68    shows a cross section after the eighth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. In  FIG.  68   , likewise as in  FIG.  66   , a white broken line represents an approximate position of the bottom surface of the groove structure. 
     Example 2-7 
     The sample of Example 2-7 was produced in the same way as the sample of Example 2-5 except that the ninth portion of the sample of Example 2-4 was filled with an electrically-conductive paste.  FIG.  69    is a microscopic image showing the ninth portion before being filled with an electrically-conductive paste. Also in this example, likewise as the sample of Example 2-5 and the sample of Example 2-6, formation of a plurality of first grooves by scanning with a laser light beam along the first direction and formation of a plurality of second grooves by scanning with a laser light beam along the second direction were sequentially performed.  FIG.  70    shows a cross section after the ninth portion was filled with an electrically-conductive paste and the electrically-conductive paste was cured. In  FIG.  70   , a white broken line represents an approximate position of the bottom surface of the groove structure. 
     It was found from the cross-sectional images of the samples of Example 2-5 to Example 2-7 ( FIG.  66   ,  FIG.  68    and  FIG.  70   ) that, in each of the samples, part of the wiring was present inside the first grooves and the second recesses. Specifically, the wiring closely followed the shape of the bottom portion of the groove structure, and no void occurred between the wiring and the bottom portion of the groove structure. 
     Evaluation of Adhesion of Wirings 
     Next, simple evaluation of the adhesion of the wirings was carried out by a method compliant with a crosscut test defined by JIS K 5600-5-6 (1999) likewise as evaluation of the mechanical properties of a paint coating. 
     Example 3-1 
     First, a groove structure including seven rectangular portions having a bottom surface defined by a set of a plurality of first grooves was formed in a resin plate. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 0.3 W to 2.8 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Pitch of the first grooves: 15 μm. 
     Hereinafter, the seven portions formed in this step are referred to as “eleventh portion”, “twelfth portion”, “thirteenth portion”, “fourteenth portion”, “fifteenth portion”, “sixteenth portion” and “seventeenth portion”. Herein, the laser power was adjusted such that the depth of the first grooves was different among the eleventh to seventeenth portions. The laser power in formation of the eleventh portion was 0.3 W. The dimension of the eleventh to seventeenth portions as viewed from the top was in the range of about 300 μm to about 500 μm. 
     Then, by scanning with a laser light beam in the second direction that meets the first direction, the bottom portion of the eleventh portion of the groove structure was irradiated with the laser light beam. Thereby, likewise as in the example shown in  FIG.  5   , a plurality of second grooves each extending in the second direction were formed in the bottom portion of the eleventh portion so as to overlap the first grooves. Herein, also, a direction selected as the second direction was perpendicular to the first direction. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 0.3 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Pitch of the second grooves: 20 μm. 
     The depth of the second grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the second grooves was about 5 μm. 
     Then, likewise as in the sample of Example 1-5, the eleventh portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Example 3-1 was produced which had a wiring formed of the electrically-conductive paste inside the eleventh portion. 
     Example 3-2 
     A plurality of second grooves each extending in the second direction were formed in the bottom portion of the twelfth portion so as to overlap the first grooves in the same way as the sample of Example 3-1 except that, of the laser light irradiation conditions, the laser power was changed to 0.6 W so as to increase the depth of the first grooves and the depth of the second grooves. The depth of the second grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the second grooves was about 10 μm. 
     Then, likewise as in the sample of Example 3-1, the twelfth portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Example 3-2 was produced which had a wiring formed of the electrically-conductive paste inside the twelfth portion. 
     Example 3-3 
     A plurality of second grooves each extending in the second direction were formed in the bottom portion of the thirteenth portion so as to overlap the first grooves in the same way as the sample of Example 3-1 except that, of the laser light irradiation conditions, the laser power was changed to 1.2 W so as to increase the depth of the first grooves and the depth of the second grooves. The depth of the second grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the second grooves was about 25 μm. 
     Then, likewise as in the sample of Example 3-1, the thirteenth portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Example 3-3 was produced which had a wiring formed of the electrically-conductive paste inside the thirteenth portion. 
     Example 3-4 
     A plurality of second grooves each extending in the second direction were formed in the bottom portion of the fourteenth portion so as to overlap the first grooves in the same way as the sample of Example 3-1 except that, of the laser light irradiation conditions, the laser power was changed to 2.4 W so as to increase the depth of the first grooves and the depth of the second grooves. The depth of the second grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the second grooves was about 50 μm. 
     Then, likewise as in the sample of Example 3-1, the fourteenth portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Example 3-4 was produced which had a wiring formed of the electrically-conductive paste inside the fourteenth portion. 
     Comparative Example 3-1 
     The fifteenth portion which had a plurality of first grooves each extending in the first direction was formed in the same way as the sample of Example 3-1 except that, in formation of the first grooves, the laser light irradiation conditions were changed so as to decrease the depth of the first grooves. In formation of the plurality of first grooves, herein, the laser power was changed to 0.2 W. Note that, herein, a plurality of second grooves were not formed. The depth of the first grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the first grooves was about 1.5 μm. 
     Then, likewise as in the sample of Example 3-1, the fifteenth portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Comparative Example 3-1 was produced which had a wiring formed of the electrically-conductive paste inside the fifteenth portion. 
     Comparative Example 3-2 
     The sixteenth portion which had a plurality of first grooves each extending in the first direction was formed in the same way as the sample of Comparative Example 3-1 except that the laser light irradiation conditions were changed such that the depth of the first grooves is smaller than in the sample of Example 3-1. In formation of the plurality of first grooves, herein, the laser power was changed to 0.2 W. 
     Then, by scanning with a laser light beam in the second direction that meets the first direction, the bottom portion of the sixteenth portion of the groove structure was irradiated with the laser light beam. Thereby, likewise as in the example shown in  FIG.  5   , a plurality of second grooves each extending in the second direction were formed in the bottom portion of the sixteenth portion so as to overlap the first grooves. Herein, also, a direction selected as the second direction was perpendicular to the first direction. The irradiation conditions of the laser light in this step are the same as those for formation of the first grooves except that the laser power was 0.2 W and the pitch of the second grooves was 20 μm. The depth of the second grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the second grooves was about 3 μm. 
     Then, likewise as in the sample of Example 3-1, the sixteenth portion of the groove structure was filled with an electrically-conductive paste and the electrically-conductive paste was cured. Thereby, the sample of Comparative Example 3-2 was produced which had a wiring formed of the electrically-conductive paste inside the sixteenth portion. 
     Comparative Example 3-3 
     The seventeenth portion which had a plurality of first grooves each extending in the first direction was formed in the same way as the sample of Example 3-1 except that, in formation of the first grooves, the laser light irradiation conditions were changed so as to increase the depth of the first grooves. In formation of the plurality of first grooves, herein, the laser power was changed to 2.8 W. 
     Then, by scanning with a laser light beam in the second direction that meets the first direction, the bottom portion of the seventeenth portion of the groove structure was irradiated with the laser light beam under the same laser light irradiation conditions as those for the sample of Comparative Example 3-2 except that the laser power was 2.8 W, whereby a plurality of second grooves were formed in the bottom portion of the seventeenth portion so as to overlap the first grooves. The depth of the second grooves was measured by cross-sectional image taken with the use of a laser microscope. The average depth of the second grooves was about 60 μm. 
     Then, in the same way as the sample of Example 3-1, we attempted to fill the seventeenth portion of the groove structure with an electrically-conductive paste. However, the inside of the seventeenth portion was not sufficiently filled with the electrically-conductive paste. After the electrically-conductive paste was cured, a wiring pattern of a desired shape was not formed. 
     Then, in each of the samples of Example 3-1 to Example 3-4, Comparative Example 3-1 and Comparative. Example 3-2, grooves are formed in the form of a grid using a cutter in a wiring so as to reach the bottom surface of the groove structure, whereby  25  rectangular sections in total were formed. In this step, the grooves were formed in the wiring at a pitch of about 1 mm. 
     Then, a cellophane tape was placed onto the surface of the wiring so as to cover the plurality of sections formed in the wiring. Before five minutes elapsed since the tape was placed, the tape was peeled off in the normal direction of the surface of the wiring. Of the 25 sections formed in the wiring, the proportion of sections in which the wiring was adhered to the tape and separated from the resin plate was checked, whereby the adhesion of the wiring was evaluated. 
     In the sample of Example 3-1, separation was found in only one of the 25 sections. In each of the samples of Example 3-2 to Example 3-4, separation was not found in any of the 25 sections. Meanwhile, in the sample of Comparative Example 3-1 and the sample of Comparative Example 3-2, separation was found in 12.5 sections and 5 sections, respectively, out of the 25 sections. 
       FIG.  71    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Example 3-3 before being filled with an electrically-conductive paste.  FIG.  72    shows the external appearance of the wiring after the tape was peeled off in the sample of Example 3-3.  FIG.  73    is an enlarged microscopic image showing the bottom surface of the groove structure of the sample of Comparative Example 3-1 before being filled with an electrically-conductive paste.  FIG.  74    shows the external appearance of the wiring after the tape was peeled off in the sample of Comparative Example 3-2. 
     As seen from the results after the tape was peeled off, formation of the second grooves can provide the effect of preventing separation of the wiring due to the anchoring effect. Particularly, when the depth of the second grooves is not less than 5 μm, it is advantageous in preventing separation of the wiring. It was also found that although a greater anchoring effect is likely to be achieved as the second grooves are deeper, keeping the depth of the second grooves so as not to exceed 60 μm is advantageous in forming a wiring of a desired shape. 
     Evaluation of Moldability of Groove Structure and Wirings 
     Next, a light-emitting structure was prepared which was similar to the light-emitting structures  200 Af shown in  FIG.  26   . A groove structure and wirings were formed on the lower surface side of the light-emitting structure through the procedures of the groove structure formation step and the wiring formation step of the above-described embodiment, and the moldability of the groove structure and the wirings was evaluated. Herein, before the groove structure was formed, the lower surfaces of the electrodes of a light-emitting element (the lower surface  221   b  of the first electrode  221  and the lower surface  222   b  of the second electrode  222 ) was exposed out of the lower surface of the light-emitting structure used for evaluation. 
     Example 4-1 
     After the light-emitting structure was prepared, the lower surface of the light-emitting structure was scanned with a laser light beam in a certain direction (first direction) such that a plurality of first grooves each extending in the first direction were formed. By scanning with the laser light beam, part of the light-reflective member and part of the electrodes of the light-emitting element were removed, whereby a groove structure was formed in the lower surface of the light-emitting structure such that the groove structure had a bottom surface defined by a set of the plurality of first grooves. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 2.4 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Pitch of the first grooves: 15 μm or 30 μm. 
     Then, the bottom portion of the groove structure was further irradiated with a laser light beam by scanning with the laser light beam in the second direction that meets the first direction. Thereby, a plurality of first recesses in the dot shapes, which were the same as those of the example shown in  FIG.  4   , were formed in the bottom portion of the groove structure. Herein, a direction selected as the second direction was perpendicular to the first direction. When viewed from the top, each of the first recesses had a diameter of about 0.1 mm. The irradiation conditions of the laser light in this step are as follows: 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 2.4 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Distance between the centers of the first recesses: 15 μm. 
       FIG.  75    shows a bottom surface of a light-emitting structure after the groove structure formation step was performed.  FIG.  76    shows an image of a portion enclosed by a broken circle shown in  FIG.  75   , which was obtained by a laser microscope.  FIG.  77    shows an image of a cross section of a groove structure, which was obtained by a laser microscope.  FIG.  77    shows a cross section of a portion formed in the light-reflective member of the groove structure. 
     Then, in the same way as the sample of Example 1-5, the groove structure was filled with an electrically-conductive paste, and the electrically-conductive paste was cured, whereby a wiring was formed in the groove structure (corresponding to the previously-described wiring formation step), resulting in the sample of Example 4-1.  FIG.  78    shows a cross section after the groove structure was filled with the electrically-conductive paste and the electrically-conductive paste was cured. 
     Example 4-2 
     The sample of Example 4-2 was produced in the same way as the sample of Example 4-1 except that, instead of forming a plurality of first recesses, a plurality of second grooves each extending in the second direction were further formed in the bottom portion of the groove structure by irradiating the bottom portion of the groove structure with laser light by scanning with a laser light beam in the second direction that is different from the first direction. The irradiation conditions of the laser light in formation of the plurality of second grooves are as follows. Herein, also, a direction selected as the second direction was perpendicular to the first direction. 
     Peak wavelength of the laser light: 532 nm; 
     Laser power: 2.4 W; 
     Pulse width: 100 nanoseconds; 
     Frequency: 50 kHz; 
     Operation speed: 200 mm/s; 
     Defocus: 0 μm; 
     Pitch of the second grooves: 50 μm. 
       FIG.  79    shows a bottom surface of a light-emitting structure after the groove structure formation step was performed but before the wiring formation step was performed.  FIG.  80    shows a SEM image of part of a bottom portion of a groove structure.  FIG.  81    shows an image of a portion enclosed by a broken circle shown in  FIG.  79   , which was obtained by a laser microscope.  FIG.  82    shows an image of a cross section of a groove structure, which was obtained by a laser microscope.  FIG.  80    and  FIG.  82    each shows a cross section of a portion formed in the light-reflective member of the groove structure as does  FIG.  77   . 
     After the groove structure was formed, the groove structure was filled with an electrically-conductive paste, and the electrically-conductive paste was cured, whereby a wiring was formed in the groove structure as in the sample of Example 4-1.  FIG.  83    shows a cross section after the groove structure was filled with the electrically-conductive paste and the electrically-conductive paste was cured. 
     Reference Example 4-1 
     After the plurality of first grooves were formed, the sample of Reference Example 4-1 was produced in the same way as the sample of Example 4-1 except that none of the plurality of first recesses and the plurality of second grooves was formed.  FIG.  84    shows a bottom surface of a light-emitting structure after the groove structure formation step was performed but before the wiring formation step was performed.  FIG.  85    shows a SEM image of part of a bottom portion of a groove structure.  FIG.  86    shows an image of a portion enclosed by a broken circle shown in  FIG.  84   , which was obtained by a laser microscope.  FIG.  87    shows an image of a cross section of a groove structure, which was obtained by a laser microscope.  FIG.  85    and  FIG.  87    each shows a cross section of a portion formed in the light-reflective member of the groove structure as does  FIG.  77   . 
     After the groove structure was formed, the groove structure was filled with an electrically-conductive paste, and the electrically-conductive paste was cured, whereby a wiring was formed in the groove structure as in the sample of Example 4-1.  FIG.  88    shows a cross section after the groove structure was filled with the electrically-conductive paste and the electrically-conductive paste was cured. 
     As seen from the cross-sectional image of the sample of Example 4-1 shown in  FIG.  78   , part of the wiring was present inside the first grooves and inside the first recesses in the sample of Example 4-1. Also, as seen from the cross-sectional image of the sample of Example 4-2 shown in  FIG.  83   , part of the wiring was present inside the first grooves and inside the second grooves in the sample of Example 4-2. That is, in these samples, the shape of the wiring closely followed the shape of the bottom portion of the groove structure. Thus, a high anchoring effect between the wiring and the bottom portion of the groove structure can be expected. 
     It was found from  FIG.  85    and  FIG.  86    that, in the sample of Reference Example 4-1, the bottom surface of the groove structure had a relatively smooth shape. As seen from  FIG.  88   , also in the sample of Reference Example 4-1, no void occurred between the wiring and the bottom portion of the groove structure. 
     According to the embodiments of the present disclosure, a substrate which has complicated wiring patterns is basically unnecessary, and a light-emitting device which can be easily mounted is provided. The embodiments of the present disclosure are broadly applicable to various light sources for lighting purposes, on-board light sources, light sources for backlights, etc. 
     While certain embodiments of the present invention has been described above, it will be apparent to those skilled in the art that the invention may be modified in numerous ways and may assume many embodiments other than those specifically described above. Accordingly, it is intended by the appended claims to cover all modifications of the invention that fall within the spirit and scope of the invention.