Abstract:
A light emitting device is provide comprising a light emitting diode (LED) chip having a first main surface and a second main surface opposing the first main surface, and one or more side surfaces extending between the first main surface and second main surface. A plurality of electrodes is disposed on the first main surface. A wavelength conversion film is disposed on the second main surface. A mark is formed in the wavelength conversion film. The mark contains orientation information of the light emitting device, thereby enabling the light emitting device to be properly oriented on a receiving substrate.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2014-0004205 filed on Jan. 13, 2014, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    The present disclosure relates to a semiconductor light emitting device. 
         [0003]    A semiconductor light emitting diode (LED) is a semiconductor device converting electrical energy into optical energy, and includes a compound semiconductor material emitting light having a particular wavelength based on an energy band gap. Compared to a filament-based light source, a semiconductor LED has various advantages such as a long lifespan, low power consumption, excellent initial driving characteristics, and the like, and thus, demand for semiconductor LEDs has continued to grow. The uses of semiconductor LEDs have extended to devices, from backlight units (BLU) for Liquid Crystal Displays (LCD) to general illumination devices, within various technical fields. 
         [0004]    Semiconductor LED chips include electrodes having different polarities (positive (+) and negative (−) polarities), and thus, a direction of a chip needs to be accurately determined during work. For example, in mounting a device, failures in accurately determining a direction of a chip may cause defective electrode connections. 
       SUMMARY 
       [0005]    An aspect of the present disclosure may provide a semiconductor light emitting device capable of recognizing a direction of a semiconductor light emitting diode (LED) chip. 
         [0006]    An aspect of the present disclosure is a light emitting device comprising a light emitting diode (LED) chip having a first main surface and a second main surface opposing the first main surface, and one or more side surfaces extending between the first main surface and second main surface. A plurality of electrodes is disposed on the first main surface. A wavelength conversion film is disposed on the second main surface. A mark is formed in the wavelength conversion film. The mark contains orientation information of the light emitting device, thereby enabling the light emitting device to be properly oriented on a receiving substrate. 
         [0007]    In certain embodiments of the light emitting device, the mark may be a hole formed in the peripheral portion of the wavelength conversion film. The hole may be filled with a marking material. The marking material may be a reflective material. The marking material may be a different color than the wavelength conversion film. 
         [0008]    In certain embodiments of the light emitting device, the mark may comprise a colored marking material. 
         [0009]    In certain embodiments of the light emitting device, the mark may comprise an ink. 
         [0010]    In certain embodiments of the light emitting device, the wavelength conversion film may comprise a phosphor film. 
         [0011]    In certain embodiments, the light emitting device may further comprise a reflective structure surrounding the one or more sides of the LED chip. The reflective structure may have a first main surface and a second main surface opposing the first main surface, and the first main surface of the LED chip and the first main surface of the reflective structure are substantially coplanar. The reflective structure may have a first main surface and an opposing second main surface extending in a first direction, and one or more outer side surfaces extending between the reflective side layer first main surface and second main surface in a second direction substantially perpendicular to the first direction. The wavelength conversion film may have a first main surface and an opposing second main surface extending in the first direction, and one or more side surfaces extending between the phosphor film first main surface and second main surface in the second direction. The outer side surfaces of the reflective structure and the side surfaces of the wavelength conversion film may be substantially aligned in the second direction. The reflective structure may have a first main surface and an opposing second main surface extending in a first direction, and an opening extending between the first main surface and the second main surface in a second direction substantially perpendicular to the first direction, wherein the opening surrounds the LED chip. 
         [0012]    In certain embodiments, the light emitting device may further comprise at least one additional mark formed in the peripheral portion of the wavelength conversion film. 
         [0013]    In certain embodiments of the light emitting device, The mark may be located in a peripheral portion of the wavelength conversion film. 
         [0014]    In another aspect of the present disclosure, a method of fabricating a light emitting device is provided comprising forming a wavelength conversion film and forming a plurality of marks in the wavelength conversion film. A plurality of LED chips is attached to the wavelength conversion film after forming the marks. Each LED chip has a first main surface and a second main surface opposing the first main surface. The first main surfaces of the LED chips are attached to the wavelength conversion film, the LED chips are spaced-apart from each other, and the LED chips are positioned on the wavelength conversion film relative to at least one of the marks. After attaching the LED chips, the wavelength conversion film is cured, and a singulation process is performed to form a plurality of individual LED devices. 
         [0015]    In certain embodiments, the method of fabricating the light emitting device may further comprise depositing a reflective material between the spaced-apart LED chips to form a reflective structure surrounding each LED chip. Each chip may be positioned on the wavelength conversion film relative to a corresponding mark. The mark may comprise a colored marking material. 
         [0016]    In certain embodiments, the method of fabricating the light emitting device may further comprise depositing a phosphor material between the spaced-apart LED chips to form a phosphor layer surrounding each LED chip. 
         [0017]    In certain embodiments of the method of fabricating the light emitting device, the forming a plurality of marks in the wavelength conversion film may comprise forming a plurality of holes in the wavelength conversion film. 
         [0018]    In certain embodiments, the method of fabricating the light emitting device may further comprise filling the plurality of holes with a marking material. The marking material may be a reflective material. The marking material may be optically distinguishable from the wavelength conversion film. 
         [0019]    In certain embodiments of the method of fabricating the light emitting device, the mark may comprise an ink. The mark may be formed using a printing process. Each mark may be located in a peripheral portion of the individual light emitting device. 
         [0020]    In certain embodiments of the method of fabricating the light emitting device, the wavelength conversion film may comprise a phosphor film. 
         [0021]    In certain embodiments of the method of fabricating the light emitting device, the reflective structure may have a first main surface and a second main surface opposing the first main surface, and the first main surface of the LED chip and the first main surface of the reflective structure are substantially coplanar. 
         [0022]    In certain embodiments of the method of fabricating the light emitting device, the reflective structure may have a first main surface and an opposing second main surface extending in a first direction, and one or more outer side surfaces extending between the reflective side layer first main surface and second main surface in a second direction substantially perpendicular to the first direction. The wavelength conversion film may have a first main surface and an opposing second main surface extending in the first direction, and one or more side surfaces extending between the phosphor film first main surface and second main in the second direction. The outer side surfaces of the reflective structure and the side surfaces of the wavelength conversion film may be substantially aligned in the second direction. 
         [0023]    In another aspect of the present disclosure a light emitting device comprises a light emitting diode (LED) chip comprising a first conductivity-type nitride semiconductor base layer formed on a substrate, and a plurality of nano-light emitting structures spaced apart from each other formed on the nitride semiconductor base layer. Each nano-light emitting structure comprises a nanocore comprising the first conductivity-type nitride semiconductor. An active layer is disposed on the nanocore, and a second conductivity-type nitride semiconductor layer is disposed on the active layer. A mark is formed in a peripheral portion of the light emitting device. 
         [0024]    In certain embodiments, the light emitting device may further comprise a contact electrode disposed on the second conductivity-type nitride semiconductor layers of the plurality of nano-light emitting structures. The light emitting device of claim  31 , may further comprise a first electrode contacting the base layer and a second electrode contacting the contact electrode. The light emitting device may further comprise an insulating layer disposed on the contact electrode. 
         [0025]    In certain embodiments of the light emitting device, the mark may be a hole formed in the peripheral portion of the light emitting device. The hole may be filled with a marking material. The marking material may be a reflective material. 
         [0026]    In certain embodiments of the light emitting device, the mark may comprise a colored marking material. 
         [0027]    In certain embodiments of the light emitting device, the mark may comprise an ink. 
         [0028]    In certain embodiments, the light emitting device may further comprise a current blocking layer formed between the nanocore and the active layer. The current blocking layer may comprise an undoped nitride or a nitride doped with a conductivity-type impurity opposite to that of the nanocore. 
         [0029]    In certain embodiments, the light emitting device may further comprise at least one additional mark formed in the peripheral portion of the light emitting device. 
         [0030]    In certain embodiments of the light emitting device, the mark contains orientation information, thereby enabling the light emitting device to be properly oriented to a receiving substrate. 
         [0031]    In certain embodiments, the light emitting device may further comprise a protective film overlying the LED chip. The mark may be formed in the protective film. The mark may be optically distinguishable from the protective film. 
         [0032]    In another aspect of the present disclosure, a method of fabricating a light emitting device comprises forming a wavelength conversion film, and forming a plurality of marks in the wavelength conversion film. A plurality of LED chips is attached to the wavelength conversion film. Each LED chip has a first main surface and a second main surface opposing the first main surface. The first main surfaces of the LED chips are attached to the wavelength conversion film, and the LED chips are spaced-apart from each other. A singulation process is performed to form a plurality of individual LED devices. 
         [0033]    In certain embodiments, the method of fabricating the light emitting device may further comprise depositing a reflective material between the spaced-apart LED chips to form a reflective structure surrounding each LED chip. The reflective structure may have a first main surface and a second main surface opposing the first main surface, and the first main surface of the LED chip and the first main surface of the reflective structure may be substantially coplanar. The reflective structure may have a first main surface and an opposing second main surface extending in a first direction, and one or more outer side surfaces extending between the reflective side layer first main surface and second main surface in a second direction substantially perpendicular to the first direction. The wavelength conversion film may have a first main surface and an opposing second main surface extending in the first direction, and one or more side surfaces extending between the phosphor film first main surface and second main in the second direction. The outer side surfaces of the reflective structure and the side surfaces of the wavelength conversion film may be substantially aligned in the second direction. 
         [0034]    In certain embodiments, the method of fabricating the light emitting device may further comprise depositing a phosphor material between the spaced-apart LED chips to form a phosphor layer surrounding each LED chip. 
         [0035]    In certain embodiments of the method of fabricating a light emitting device, the forming a plurality of marks in the wavelength conversion film may comprise forming a plurality of holes in the wavelength conversion film. The method may further comprise filling the plurality of holes with a marking material. The marking material may be a reflective material. The marking material may be optically distinguishable from the wavelength conversion film. 
         [0036]    In certain embodiments of the method of fabricating the light emitting device, the mark may comprise a colored marking material. 
         [0037]    In certain embodiments of the method of fabricating the light emitting device, the mark may comprise an ink. The mark may be formed using a printing process. 
         [0038]    In certain embodiments of the method of fabricating the light emitting device, the wavelength conversion film may comprise a phosphor. 
         [0039]    In certain embodiments of the method of fabricating the light emitting device, each mark may be located in a peripheral portion of the individual light emitting device. 
         [0040]    In certain embodiments of the method of fabricating the light emitting device, each chip may be positioned on the wavelength conversion film relative to a corresponding mark. 
         [0041]    In certain embodiments of the method of fabricating the light emitting device, the LED chips may be positioned on the wavelength conversion film relative to at least one of the marks. 
         [0042]    In certain embodiments, the method of fabricating the light emitting device, may further comprise curing the wavelength conversion film. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0043]    The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings. 
           [0044]      FIG. 1  is a perspective view schematically illustrating a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
           [0045]      FIG. 2  is a perspective view schematically illustrating a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
           [0046]      FIG. 3  is an exploded perspective view illustrating the semiconductor light emitting device of  FIG. 2 . 
           [0047]      FIGS. 4 through 6  are cross-sectional views illustrating various semiconductor light emitting diode chips employable in an exemplary embodiment of the present disclosure. 
           [0048]      FIGS. 7 through 15B  are views illustrating major processes of a method of manufacturing a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
           [0049]      FIGS. 16A ,  16 B,  17 A, and  17 B are top and bottom plan views of the semiconductor light emitting device obtained in  FIGS. 15A and 15B . 
           [0050]      FIG. 18  is a perspective view schematically illustrating a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
           [0051]      FIG. 19  is a cross-sectional view illustrating the semiconductor light emitting device of  FIG. 18  taken along line X-X′. 
           [0052]      FIG. 20  is a plan view schematically illustrating a wafer for a plurality of semiconductor light emitting devices. 
           [0053]      FIGS. 21 through 26  are cross-sectional views illustrating major processes of a method of manufacturing a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
           [0054]      FIG. 27  is a CIE 1931 color space chromaticity diagram illustrating various examples of wavelength conversion materials employable in a wavelength conversion part. 
           [0055]      FIGS. 28 and 29  are views illustrating examples of a backlight unit in which a semiconductor light emitting device according to an exemplary embodiment of the present disclosure may be employed. 
           [0056]      FIG. 30  is a view illustrating an example of a lighting device employing a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
           [0057]      FIG. 31  is a view illustrating an example of a head lamp employing a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0058]    Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. 
         [0059]    The disclosure may, however, be exemplified in many different forms and should not be construed as being limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. 
         [0060]    In the drawings, the shapes and dimensions of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like elements. 
         [0061]    Meanwhile, an expression “one example” used in the present disclosure does not refer to identical examples and is provided to stress different unique features between each of the examples. However, examples provided in the following description are not excluded from being associated with features of other examples and implemented thereafter. For example, even if matters described in a specific example are not described in a different example thereto, the matters may be understood as being related to the other example, unless otherwise mentioned in descriptions thereof. 
         [0062]      FIG. 1  is a perspective view schematically illustrating a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
         [0063]    Referring to  FIG. 1 , a semiconductor light emitting device  20  according to the present exemplary embodiment includes a semiconductor light emitting diode (LED) chip  10  and a protective film  25 . 
         [0064]    The semiconductor LED chip  10  may have a first surface  10 A on which first and second electrodes  18   a  and  18   b  are disposed and a second surface  10 B opposing the first surface  10 A. The semiconductor LED chip  10  may be a nitride semiconductor LED chip. 
         [0065]    The protective film  25  may be positioned on the second surface  10 B of the semiconductor LED chip  10 . The protective film  25  may be an insulating layer such as a passivation layer. For example, the protective film may be formed of various materials such as a resin, glass, oxide, nitride, ceramic, and the like. The protective film  25  employed in the present exemplary embodiment is illustrated as an insulating layer such as a passivation layer, but it may also be a wavelength conversion film containing a wavelength conversion material such as a phosphor or a quantum dot. A semiconductor light emitting device emitting white light by using such a wavelength conversion layer may be provided. The semiconductor LED chip  10  may include an active layer emitting light having different wavelengths to output white light without using the phosphor. For example, in case of a semiconductor LED chip having nano-light emitting structures (please refer to  FIG. 6 ), an active layer emitting light having different wavelengths, even in the case that the active layer is grown under the same growth conditions, may be obtained by varying sizes of nanocores and/or intervals therebetween, and white light may be implemented by using such an active layer. 
         [0066]    Lateral surfaces of the protective film  25  may be substantially flat to be coplanar with those of the semiconductor LED chip  10 . Being coplanar may be understood as having a surface on a common plane obtained through a cutting process. Unlike the present exemplary embodiment, the protective film  25  may be configured to extend to the lateral surfaces of the semiconductor LED chip  10 . 
         [0067]    The semiconductor light emitting device  20  may include a mark  29  provided in the protective film  25 . The mark  29  may include information indicating a particular direction of the semiconductor LED chip  10 . By using the information regarding a chip direction, polarities (positive (+) or negative (−)) of electrodes  18   a  and  18   b  disposed on the first surface  10 A may be identified. Based on direction identification, the electrodes  18   a  and  18   b  of the semiconductor LED chip  10  may be accurately connected to electrodes of a mounting board. 
         [0068]    The mark  29  may include directional information (for example, a symbol such as an arrow, a character, or the like) by itself, or may simply denote information regarding a chip direction by using a formation position thereof. For example, the mark  29  may be disposed asymmetrically with the center of the protective film  25  as a reference, and information regarding a chip direction may be indicated, based on such asymmetry. 
         [0069]    In detail, as illustrated in  FIG. 1 , the mark  29  may be disposed in one corner of the protective film  25 . It may be noted that the left corner side where the mark  29  is positioned is adjacent to the second electrode  18   b . By using the asymmetrical arrangement of the mark  29 , a chip direction (or electrode direction) may be easily recognized. 
         [0070]    The mark  29  employed in the present exemplary embodiment may have a hole H penetrating a region of the protective film  25 . The hole H may be filled with a filler material visually discernible from the protective film  25 . 
         [0071]    In an example, the filler material may be a material having a particular color. The particular color of the filler material may be easily discernible from that of the protective film  25 . In another example, the filler material may be a resin containing reflective powder. The reflective powder may be metal powder or white ceramic powder having high reflectivity. For example, the reflective powder may be a material selected from the group consisting of TiO 2 , Al 2 O 3 , Nb 2 O 5 , Al 2 O 3  and ZnO, and in particular, may be white powder such as TiO 2  and Al 2 O 3 . The resin may be a transparent resin such as an epoxy resin or a silicon resin. 
         [0072]    The mark  29  having directional information of the chip may be implemented to have various other shapes. For example, the mark  29  may be applied to a particular position of the surface of the protective film  25  through a printing process. Also, as mentioned above, the protective film  25  may be implemented as a wavelength conversion film containing a phosphor or a quantum dot capable of converting a wavelength of at least a partial amount of light generated by the LED chip into a different wavelength. 
         [0073]      FIG. 2  is a perspective view schematically illustrating the semiconductor light emitting device according to an exemplary embodiment of the present disclosure, and  FIG. 3  is an exploded perspective view illustrating the semiconductor light emitting device of  FIG. 2 . 
         [0074]    Referring to  FIG. 2 , a semiconductor light emitting device  40  according to the present exemplary embodiment may include a semiconductor LED chip  30 , a reflective structure  47 , and a wavelength conversion film  45 . 
         [0075]    The semiconductor LED chip  30  may have a first surface  30 A on which first and second electrodes  38   a  and  38   b  are disposed and a second surface  30 B opposing the first surface  30 A. The reflective structure  47  may be disposed to surround the semiconductor LED chip  30 . 
         [0076]    A wavelength conversion material P such as a phosphor or a quantum dot of a wavelength conversion film  45  may be excited by light emitted from the semiconductor LED chip  30  to convert wavelength of at least a partial amount of light into a different wavelength of light. The wavelength conversion material P may be two or more types of material providing light having different wavelengths. Light converted by the wavelength conversion film  45  and unconverted light may be mixed to output white light (please refer to  FIG. 27  for a specific phosphor usage example). 
         [0077]    In an example, light generated by the semiconductor LED chip  30  may be blue light, and the wavelength conversion material P may include at least one selected from the group consisting of a green phosphor, a yellow phosphor, an orange phosphor, and a red phosphor. 
         [0078]    The wavelength conversion film  45  may be positioned on the second surface  30 B of the semiconductor LED chip  30  to cover the reflective structure  47 . The reflective structure  47  may be substantially flat to be coplanar with the second surface  30 B of the semiconductor LED chip  30 . Also, lateral surfaces of the wavelength conversion film  45  may be substantially flat to be coplanar with those of the reflective structure  47 . Being coplanar may be understood as a surface obtained through a cutting process. 
         [0079]    A mark  49  employed in the present exemplary embodiment may be formed by applying a discernible material to a region of a surface of the wavelength conversion film  45 . The discernible material may be a material such as ink that may be visually discriminated from other regions of the wavelength conversion film  45 . Such an application process may be performed by a printing process such as screen printing. 
         [0080]    The mark  49  may be disposed at the center of one edge of the wavelength conversion film  45  to indicate a particular direction of the semiconductor LED chip  30 . By using the information regarding a chip direction, polarities (positive (+) or negative (−)) of electrodes  38   a  and  38   b  disposed on the first surface  30 A may be identified. In this manner, information regarding a chip direction may be indicated through an asymmetrical arrangement of the mark  49 , similarly to the former exemplary embodiment. 
         [0081]    The mark  49  may be positioned in a region of the wavelength conversion film  45  corresponding to the reflective structure  47 . As illustrated in  FIG. 3 , the mark  49  may be applied to a surface of the wavelength conversion film  45  in contact with the semiconductor LED chip  30 . In the present exemplary embodiment, since the mark  49  is positioned in a region corresponding to the reflective structure  47 , the mark  49  may be in contact with the reflective structure  47 . As a result, the mark  49  may be excluded from a light path, not interfering with light generated by the semiconductor LED chip  30 . 
         [0082]    The wavelength conversion film  45  may be formed of a resin layer, a glass layer, or a ceramic layer containing a wavelength conversion material P such as a phosphor or a quantum dot. Thus, the wavelength conversion film  45  may be transparent or translucent. For example, in a case in which the wavelength conversion film  45  is formed of a resin layer containing a yellow phosphor, the wavelength conversion film  45  may be provided as a translucent yellow layer. Thus, although the mark  49  is positioned in the surface of the wavelength conversion film  45  in contact with the reflective structure  47 , the mark  49  may be readily recognized in the opposite surface of the wavelength conversion film  45 . Also, unlike the present exemplary embodiment, even in a light emitting device employing a protective film not containing a wavelength conversion material, rather than employing the wavelength conversion film  45 , information regarding a direction of a chip may be provided by printing the mark  49  on the protective film, similar to the present exemplary embodiment. 
         [0083]    In the present exemplary embodiment, various types of semiconductor LED chips may be employed.  FIGS. 4 through 6  are cross-sectional views illustrating various semiconductor LED chips employable in an exemplary embodiment of the present disclosure. 
         [0084]    A semiconductor LED chip  50  illustrated in  FIG. 4  includes a substrate  51  and a semiconductor laminate L formed on the substrate  51 . The semiconductor laminate L may include first and second conductivity-type semiconductor layers  52  and  56  and an active layer  54  positioned therebetween. 
         [0085]    The substrate  51  may be an insulating, conductive, or semiconductor substrate. A growth surface of the substrate  51  may have a protrusion and depression pattern C to grow a high quality crystal, as well as improve light extraction efficiency. For example, the substrate  51  may be formed of sapphire, SiC, Si, MgAl 2 O 4 , MgO, LiAlO 2 , LiGaO 2 , or GaN. 
         [0086]    The first conductivity-type semiconductor  52  may be a nitride semiconductor satisfying n-type Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1), and here, an n-type impurity may be silicon (Si). For example, the first conductivity-type nitride semiconductor layer  52  may be n-type GaN. The active layer  54  may have a multi quantum well (MQW) structure in which quantum well layers and quantum barrier layers are alternately stacked. For example, in case of a nitride semiconductor, a GaN/InGaN structure may be used. Alternatively, the active layer  54  may have a single quantum well (SQW) structure. The second conductivity-type nitride semiconductor layer  56  may be a nitride semiconductor layer satisfying p-type Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1), and here, a p-type impurity may be magnesium (Mg). For example, the second conductivity-type nitride semiconductor layer  56  may be p-type AlGaN/GaN. 
         [0087]    In the semiconductor laminate L employed in the present exemplary embodiment, regions of the second conductivity-type nitride semiconductor layer  56  and the active layer  54  may be removed through mesa etching, allowing the first conductivity-type nitride semiconductor layer  52  to have a partially exposed region. 
         [0088]    A first electrode  58   a  may be disposed in the exposed region of the first conductivity-type nitride semiconductor layer  62 , and an ohmic-contact layer  57  and a second electrode  58   b  may be sequentially disposed on the second conductivity-type nitride semiconductor layer  56 . For example, the ohmic-contact layer  57  may include at least one of materials such as ITO, ZnO, a graphene layer, Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, and may have a structure including two or more layers such as Ni/Ag, Zn/Ag, Ni/Al, Zn/Al, Pd/Ag, Pd/Al, Ir/Ag. Ir/Au, Pt/Ag, Pt/Al, Ni/Ag/Pt, and the like. The first and second electrodes  58   a  and  58   b  may include materials such as Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, and the like, and may be a single layer or have a structure including two or more layers, but the present disclosure is not limited thereto. A reflective electrode structure may be employed to implement a flipchip structure, as needed. For example, the first electrode  58   a  may have a structure including Al/Ti/Pt/Ti layers (for example, Al/Ti/Pt/Ti/Cr/Au/Sn solder, Al/Ti/Pt/Ti/Pt/Ti/Pt/Ti/Ni/Pt/Au/Sn solder, or Al/Ti/Pt/Ti/Pt/Ti/Pt/Ti/Au/Ti/AuSn) or a structure including Cr/Au layers (for example, Cr/Au/Pt/Ti/Ti/TiN/Ti/Ni/Au). The second electrode  58   b  may have a structure including an Ag layer (for example, Ag/Ti/Pt/Ti/TiN/Ti/TiN/Cr/Au/Ti/Au). 
         [0089]    A semiconductor LED chip  70  illustrated in  FIG. 5  includes a substrate  71  and a semiconductor laminate L disposed on the substrate  71 . The semiconductor laminate L may include a first conductivity-type semiconductor layer  72 , an active layer  74 , and a second conductivity-type semiconductor layer  76 . 
         [0090]    The semiconductor LED chip  70  includes first and second contact electrodes  78   a  and  78   b  respectively connected to the first and second conductivity-type semiconductor layers  72  and  76 . The semiconductor LED chip  70  includes an insulating layer  77  covering the semiconductor laminate L. The insulating layer  77  may have first and second openings H 1  and H 2  respectively exposing partial regions of the first and second contact electrodes  78   a  and  78   b.    
         [0091]    The semiconductor LED chip  70  may include first and second electrode pads  79   a  and  79   b  respectively connected to the first and second contact electrodes  78   a  and  78   b  through the first and second openings H 1  and H 2 . The first and second electrode pads  79   a  and  79   b  may include Au, Sn, Au/Sn. 
         [0092]    A semiconductor LED chip  90  illustrated in  FIG. 6  includes a substrate  91 , a base layer B disposed on the substrate  91 , and a plurality of nano-light emitting structures L disposed on the base layer B. 
         [0093]    The substrate  91  may be an insulating, conductive, or semiconductor substrate. For example, the substrate  91  may be formed of sapphire, SiC, Si, MgAl 2 O 4 , MgO, LiAlO 2 , LiGaO 2 , or GaN. The base layer B may be a nitride semiconductor satisfying Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1) and may be doped with an n-type impurity such as silicon (Si) to have a particular conductivity type. 
         [0094]    An insulating layer M may be formed on the base layer B having openings allowing nano-light emitting structures L (in particular, nanocores) to grow therein. The base layer B is exposed through the openings, and nanocores  92  may be formed in the exposed regions. The insulating layer m may be used as a mask for growing the nanocores  92 . The insulating layer M may be formed of an insulating material such as SiO 2  or SiN x  that may be used in a semiconductor process. 
         [0095]    The nano-light emitting structures L may include the nanocore  92  formed of a first conductivity-type semiconductor and an active layer  94  and a second conductivity-type semiconductor layer  96  sequentially formed on a surface of the nanocore  92 . 
         [0096]    The nanocore  92  may be a nitride semiconductor layer satisfying n-type Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1) similar to that of the base layer B. For example the nanocore  92  may be formed of n-type GaN. The active layer  94  may have a multi quantum well (MQW) structure in which quantum well layers and quantum barrier layers are alternately stacked. For example, in case of a nitride semiconductor, a GaN/InGaN structure may be used. The active layer  94  may also have a single quantum well (SQW) structure. The second conductivity-type nitride semiconductor layer  96  may be a crystal satisfying p-type Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1). 
         [0097]    The nano-structure semiconductor light emitting device  90  may include a contact electrode  96  in ohmic-contact with the second conductivity-type nitride semiconductor layer  96 . The contact electrode  95  employed in the present exemplary embodiment may be formed of a transparent electrode material to emit light toward the nano-light emitting structures (in the direction opposite to the substrate side direction). For example, the contact electrode  95  may be formed of a transparent electrode material such as indium tin oxide (ITO), and formed of graphene, as needed. 
         [0098]    The contact electrode  95  may include materials such as Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, or the like, and may have a structure including two or more layers such as Ni/Ag, Zn/Ag, Ni/Al, Zn/Al, Pd/Ag, Pd/Al, Ir/Ag. Ir/Au, Pt/Ag, Pt/Al, Ni/Ag/Pt, or the like, but the present disclosure is not limited thereto. The nano-structure semiconductor light emitting device  90  may employ a reflective electrode structure so as to be implemented to have a flipchip structure, as needed. 
         [0099]    An insulating filling part  97  may be formed in a space between the nano-light emitting structures L. The insulating filling part  97  may be formed of an insulating material such as SiO 2  or SiN X . In detail, the insulating filling part  97  may be formed of tetraethylorthosilane (TEOS), borophosphor silicate glass (BPSG), CVD-SiO 2 , spin-on glass (SOG), or a spin-on dielectric (SOD) material in order to easily fill the space between the nano-light emitting structures L. In a configuration different from the present exemplary embodiment, an electrode element related to the contact electrode  95  may fill the entirety or a portion of the space between the nano-light emitting structures L. 
         [0100]    The nano-structure semiconductor light emitting device  90  may include first and second electrodes  99   a  and  99   b . The first electrode  99   a  may be disposed in a partially exposed region of the base layer  92  formed of the first conductivity-type semiconductor. Also, the second electrode  99   b  may be disposed in an exposed portion of an extended region of the contact electrode  95 . 
         [0101]    The nano-structure semiconductor light emitting device  90  may further include a passivation layer  98 . The passivation layer  98  may be used to protect the nano-light emitting structure together with the insulating filler part  98 . The passivation layer  98  may serve to firmly maintain the first and second electrodes  99   a  and  99   b , as well as cover the exposed semiconductor region to protect it. The passivation layer  98  may be formed of a material identical or similar to that of the insulating filling part  97 . 
         [0102]    In this example, unlike a crystal face (for example, M face) of a lateral surface of the nanocore  92 , a tip portion of the nanocore  92  may have a sloped crystal face (for example, r face). A current blocking intermediate layer  93  may be formed the tip portion of the nanocore  92 . The current blocking intermediate layer  93  may be positioned between the active layer  94  and the nanocore  92 . The current blocking intermediate layer  93  may be formed of a material having high electrical resistance to block a leakage current that may be caused in the tip portion of the nanocore  92 . For example, the current blocking intermediate layer  93  may be a semiconductor layer not doped on purpose or may be a semiconductor layer doped with a second conductivity-type impurity opposite to that of the nanocore  92 . For example, in a case in which the nanocore  92  is n-type GaN, the current blocking intermediate layer  93  may be undoped GaN or GaN doped with a p-type impurity such as magnesium (Mg). The current blocking intermediate layer  93  may be a high resistance region formed of the same material (for example GaN) but implemented with various doping concentrations or doping materials, without being particularly discernible from an adjacent layer. For example, GaN may be grown, while supplying an n-type impurity, to form the nanocore  92  and GaN may continue to be grown, while preventing supply of the n-type impurity or supplying a p-type impurity such as magnesium (Mg), to form the desired current blocking intermediate layer  93 . Also, while GaN, nanocore  92 , is being grown, a source of aluminum (Al) and/or indium (In) may be additionally supplied to form the current blocking intermediate layer  93  formed of a different composition Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1). 
         [0103]      FIGS. 7 through 15  are views illustrating major processes of a method of manufacturing a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
         [0104]    As illustrated in  FIGS. 7 and 8 , a wavelength conversion film  125  having a plurality of regions S may be prepared.  FIG. 8  may be understood as a cross-sectional view of the wavelength conversion film  125  illustrated in  FIG. 7  taken along line I-I′. 
         [0105]    The wavelength conversion film  125  may be a resin containing a wavelength conversion material such as a phosphor or a ceramic film containing a wavelength conversion material such as a phosphor. In a specific example, the wavelength conversion film  125  may be glass or an oxide film containing a wavelength conversion material. In the present exemplary embodiment, the wavelength conversion film  125  is illustrated as a protective film, but in another exemplary embodiment, a different protective film not using the wavelength conversion film  125  may be used. For example, a resin, glass, an oxide film, or ceramic not containing a wavelength conversion material or containing a different functional material. 
         [0106]    The plurality of regions S refer to regions for individual light emitting devices and may have an area greater than or equal to that of a semiconductor LED chip to be applied thereto. In the present exemplary embodiment, each region S may have a sufficient area having a predetermined marginal region M surrounding a region CS in which a chip is to be disposed. A width of the marginal region M may be set a size of a structure (for example, a reflective structure) to be additionally formed and/or a line width in a cutting process, or the like. 
         [0107]    For the description purposes, the wavelength conversion film  125  is illustrated as having a 5×5 arrangement of regions (S), but the present disclosure is not limited thereto. As illustrated In  FIG. 8 , the wavelength conversion film  125  may be disposed on a support  121  such as a PET film to provide work efficiency. 
         [0108]    As illustrated in  FIGS. 9 and 10 , holes H may be formed in each of the regions S of the wavelength conversion film  125 .  FIG. 10  may be understood as a cross-sectional view of the wavelength conversion film  125  taken along line I-I′. 
         [0109]    The holes H may be used to provide a mark during a follow-up process (for example, filling process). However, holes H may also be discernible by themselves, so the holes H may be used as marks without performing any additional process. The holes H may be formed through various processes such as a punching process or laser machining. 
         [0110]    The holes H may be disposed as close as possible to an outer edge of each region S in the marginal region M so as not be positioned in a light movement path. As illustrated in  FIG. 9 , the holes may be positioned to be adjacent to the corner of each region S. The holes H may be positioned in the marginal region M in which a structure (for example, a reflective structure), rather than in the region CS in which the semiconductor LED chip  110  is disposed. The holes H may be disposed in regular positions of respective regions S or may be disposed in regularly changed positions. Such a layout may allow chips to be aligned by using the holes (please refer to  FIG. 11 ). 
         [0111]    In the present exemplary embodiment, a scheme of forming holes H is illustrated as a mark formation process, but a scheme of partially applying a discernible material such as ink by using a printing process may also be implemented in this process (please refer to  FIGS. 2 and 3 ). 
         [0112]    As illustrated in  FIGS. 11 and 12 , semiconductor LED chips  110  may be disposed in respective regions.  FIG. 11  may be understood as a cross-sectional view of the wavelength conversion film  125  illustrated in  FIG. 8  taken along line I-I′. 
         [0113]    The semiconductor LED chips  110  may be disposed in respective regions S such that a first surface  110 A in which first and second electrodes  118   a  and  118   b  are formed face upwards. A second surface  110 B of each of the semiconductor LED chips  110  may be in contact with the wavelength conversion film  125 . As described above, during this layout process, the semiconductor LED chips  110  may be accurately aligned by using the holes formed in advance. In the case in which the holes are regularly positioned in respective regions as in the present exemplary embodiment, the semiconductor LED chips  110  may be aligned based on the holes H, facilitating a desired accurate aligning process. 
         [0114]    Also, as well as in the present exemplary embodiment, a chip aligning process using a mark may also be performed in an example of directly printing a mark. Meanwhile, in order to easily align positions of the chips  110 , marks (or holes) corresponding to particular portions of outer edges may be formed. For example, marks may be disposed in corners in an “L” shape to be used as an indicator designating corner positions of the chips  110 . 
         [0115]    Subsequently, as illustrated in  FIG. 13 , bumps  119   a  and  119   b  having a predetermined height may be formed on the first and second electrodes  118   a  and  118   b.    
         [0116]    This process may be understood as an option that may be employed for a particular need. For example, this process may be advantageously used in a case of forming the reflective structure ( 127  in  FIG. 14 ) to be formed in a follow-up process such that it extends to the first surface  110 A of the chip  110 , rather than being limited to the lateral surface of the semiconductor LED chip  110 . The bumps  119   a  and  119   b  may include a eutectic metal such as gold (Au), tin (Sn), or Au/Sn. The bumps  119   a  and  119   b  may have a height greater than at least a desired thickness of a reflective structure to be positioned on the first surface  110   a  of the chip  110 . 
         [0117]    Thereafter, as illustrated in  FIG. 14A , the reflective structure  127  may be formed in the spaces between the semiconductor LED chips  110 , namely, in the marginal regions M. 
         [0118]    This process may include applying a liquid resin containing reflective powder to the marginal regions M to surround the semiconductor LED chips and curing the applied liquid resin. In particular, during operation of applying the liquid resin containing the reflective powder in this process, the holes H may be filled with the liquid resin containing the reflective powder, and marks  129  formed of the holes filled with the discernible material may be completed through the curing process. 
         [0119]    In the present exemplary embodiment, as illustrated in  FIG. 14A , the reflective structure  127  may be formed to cover even the first surface  110 A with the electrodes  118   a  and  118   b  formed thereon, as well as surrounding the lateral surfaces of the chips  110 . Through this configuration, when mounted with the first surface  110 A facing downwards, light may be more effectively extracted in a desired upward direction by the reflective structure  127  region positioned on the first surface  110 A. 
         [0120]    As described above, the reflective powder may be metal powder or white ceramic powder having high reflectivity. For example, the reflective powder may be a material selected from among TiO 2 , Al 2 O 3 , Nb 2 O 5 , Al 2 O 3 , and ZnO, and in particular, may be white powder such as TiO 2  or Al 2 O 3 . The resin may be a transparent resin such as an epoxy resin or a silicon resin. 
         [0121]    In an alternate embodiment, a phosphor layer  128  may be deposited between the spaced-apart LED chips  110  to form a phosphor layer surrounding each chip, as shown in  FIG. 14B , instead of the reflective structure  127 . The phosphor layer may be formed to cover even the first surface  110 A with the electrodes  118   a  and  118   b  formed thereon, as well as surrounding the lateral surfaces of the chips  110 . 
         [0122]    Thereafter, as illustrated in  FIGS. 15A and 15B , the reflective structure  127  region and the phosphor layer  128  formed on the first surface of the semiconductor LED chips  110  may be ground to expose the bumps  119   a  and  119   b.    
         [0123]    Through this process, a desired thickness of the reflective structure  127  and the phosphor layer  128  may be relatively accurately controlled, and the exposure of the bumps  119   a  and  119   b  guarantees a follow-up electrical connection process. Subsequently, a cutting process may be performed along the line indicated by the dotted lines to obtain individual semiconductor light emitting device.  FIGS. 16A ,  16 B,  17 A, and  17 D illustrate a semiconductor light emitting devices  120  obtained thusly. 
         [0124]    Referring to  FIGS. 16A ,  16 B,  17 A, and  17 B, the semiconductor light emitting devices  120  obtained from the aforementioned process are illustrated. 
         [0125]    The semiconductor light emitting devices  120  include the semiconductor LED chip  110  and the reflective structure  127  or phosphor layer  128  surrounding the lateral surfaces of the semiconductor LED chip  110 . Bumps  119   a  and  119   b  related to the first and second electrodes  118   a  and  118   b  are positioned on the first surface  110 A of the semiconductor LED chip  110 , and here, the bumps  119   a  and  119   b  may have an upper surface substantially flat with the surface of the reflective structure  127  or phosphor layer  128 . 
         [0126]    A wavelength conversion film  125 ′ may be positioned on the second surface of the semiconductor LED chip  110  to cover the reflective structure  127  or phosphor layer  128 . The lateral surfaces of the reflective structure  127  and phosphor layer  128  are obtained through the cutting process as described above with reference to  FIGS. 15A and 15B , and thus, lateral surfaces of the wavelength conversion film  125 ′ may be substantially coplanar with the lateral surfaces of the reflective structure  127  or phosphor layer  128 . 
         [0127]    The mark  129  employed in the present exemplary embodiment may include a hole filled with a material identical to that of the reflective structure. The mark  129  may be disposed in one corner to indicate a particular direction of the semiconductor LED chip  110 . By using the information regarding a chip direction, polarities (positive (+) or negative (−)) of the electrodes  118   a  and  118   b  disposed on the first surface  110 A may be identified. In this manner, similar to those of the former exemplary embodiments, information regarding a chip direction may be obtained through the asymmetrical arrangement of the mark  129 . 
         [0128]    Like the chip employed in the present exemplary embodiment, a plurality of first electrodes or a plurality of second electrodes may be provided. Alternatively, a plurality of first electrodes and a plurality of second electrodes may be provided. Thus, in order to appropriately express additionally required information, a plurality of marks may be employed. For example, a plurality of marks may be disposed at positions corresponding to respective electrodes to indicate the number of the electrodes together with positions of the electrodes. 
         [0129]    In the present exemplary embodiment, the configuration of providing a marginal region is illustrated, but a chip may be implemented such that lateral surfaces thereof are exposed without a marginal region. Also, without employing a reflective structure, an additional wavelength conversion film or passivation layer may be provided. 
         [0130]    In the aforementioned exemplary embodiments, the electrodes of the semiconductor LED chip are directly connected to an external circuit, but a package type semiconductor light emitting device employing a substrate having a separate electrode structure (for example, a package substrate) may also be implemented. Such a semiconductor light emitting device is illustrated in  FIGS. 18 and 19 . 
         [0131]      FIG. 18  is a perspective view schematically illustrating a semiconductor light emitting device according to an exemplary embodiment of the present disclosure, and  FIG. 19  is a cross-sectional view illustrating the semiconductor light emitting device of  FIG. 18  taken along line X-X′. 
         [0132]    Referring to  FIGS. 18 and 19 , a semiconductor light emitting device  140  according to the present exemplary embodiment includes a circuit board  151  and a semiconductor LED chip  130  mounted on the circuit board  151 . 
         [0133]    The circuit board  151  has first and second electrode structures  155  and  156 . The first and second electrode structures  155  and  156  include first and second upper electrodes  155   a  and  156   a  disposed on an upper surface of the circuit board  151 , first and second lower electrodes  155   b  and  156   b  disposed on a lower surface of the circuit board  151 , and first and second through electrodes  155   c  and  156   c  connecting the first and second upper electrodes  155   a  and  156   a  and the first and second lower electrodes  155   b  and  156   b , respectively. The circuit board  151  employed in the present disclosure is merely illustrative and may be applied in various forms. For example, the circuit board  151  may be provided as a printed circuit board (PCB) such as a metal-core PCB (MCPCB), a metal PCB (MPCB), or a flexible PCB (FPCB), as a ceramic board formed of AlN, Al 2 O 3 , or the like, or as a board with a lead frame fixed thereon. 
         [0134]    The semiconductor LED chip  130  may be mounted on the circuit board  151  in a flipchip bonding manner. Namely, the semiconductor LED chip  130  may be mounted on the circuit board  151  such that first and second electrodes  138   a  and  138   b  face the circuit board  151 . The first and second electrodes  138   a  and  138   b  may be bonded to the first and second upper electrodes  155   a  and  156   a  by using a bonding layer, for example, a eutectic metal layer. 
         [0135]    The semiconductor light emitting device  140  may include a wavelength conversion film  145  disposed to cover the semiconductor LED chip  130 . The wavelength conversion film  145  may include a wavelength conversion material P such as a phosphor. 
         [0136]    The semiconductor light emitting device  1400  may include two marks  149   a  and  149   b  formed of a discernible material and positioned in regions of a surface of the wavelength conversion film  145 . Each of the marks  149   a  and  149   b  may have different shapes and be formed at different positions. The discernible material may be a material, such as ink, visually discriminated from other regions of the wavelength conversion film  145 . The marks  149   a  and  149   b  may be formed through a printing process such as screen printing. 
         [0137]    Since the marks  149   a  and  149   b  may be disposed abreast at corners in one side to indicate electrodes (for example, lower electrodes) provided in the substrate  151 . Thus, through the marks  149   a  and  149   b , polarities (positive (+) or negative (−)) of the lower electrodes  155   b  and  156   b  disposed on the lower surface of the substrate  151  may be recognized and may be accurately connected to an external circuit. Lateral surfaces of the wavelength conversion film  145  and the lateral surfaces of the substrate  151  may be substantially flat to be coplanar, but the present disclosure is not limited thereto. In the present exemplary embodiment, the wavelength conversion film  145  may not contain a wavelength conversion material or may be changed into a protective film containing a different functional material. 
         [0138]    The package type semiconductor light emitting device may be advantageously applied to a chip scale package (CSP) semiconductor light emitting device. A manufacturing process of this exemplary embodiment may be described with reference to  FIGS. 20 through 26 . 
         [0139]    As illustrated in  FIGS. 20 and 21 , the manufacturing method may start with operation of preparing a wafer  201  with a semiconductor laminate L formed thereon. 
         [0140]    The semiconductor laminate L may be epitaxially formed on the wafer  201  for a plurality of semiconductor light emitting devices. The semiconductor laminate L may include a first conductivity-type semiconductor layer  212 , an active layer  214 , and a second conductivity-type semiconductor layer  216 . The semiconductor laminate L may be a two-dimensional (2D) stacked structure or a three-dimensional (3D) nano-light emitting structure (please refer to  FIG. 6 ) as well. 
         [0141]      FIG. 20  is a plan view schematically illustrating the wafer  201  with the semiconductor laminate L formed thereon. As illustrated in  FIG. 20 , the semiconductor laminate L for individual light emitting devices A may be formed on the wafer  201 , and  FIGS. 21 through 26  are cross-sectional views taken along line X-X′. 
         [0142]    The wafer  201  may be formed of an insulating, conductive, or semiconductor substrate. For example, the waver  201  may be formed of sapphire, SiC, Si, MgAl 2 O 4 , MgO, LiAlO 2 , LiGaO 2 , or GaN. 
         [0143]    The semiconductor laminate L may be a Group-III nitride semiconductor. For example, the first and second conductivity-type semiconductor layers  212  and  216  may be a nitride single crystal having a composition of Al x In y Ga 1-x-y N (0≦x&lt;1, 0≦y&lt;1, 0≦x+y&lt;1). The active layer  214  may have a multi quantum well (MQW) structure in which quantum well layers and quantum barrier layers are alternately stacked. For example, in case of a nitride semiconductor, a GaN/InGaN structure may be used. 
         [0144]    The first and second electrodes  218  and  219  may be positioned to be connected to the first and second conductivity-type semiconductor layers  212  and  216 , respectively. The first and second electrodes  218  and  219  may be provided in each of individual light emitting device regions. 
         [0145]    In the present exemplary embodiment, the first electrode  218  is formed by using a via v connected to the first conductivity-type semiconductor layer  212 . An insulating layer  217  is formed within the via v and portions of the surfaces of the semiconductor laminate L to prevent the first electrode  218  from being undesirably connected to the active layer  214  and the second conductivity-type semiconductor layer  216 . In this manner, in the present exemplary embodiment, a single first electrode  218  and a single second electrode  219  are formed on the same surface, but according to a chip structure, only an electrode having one polarity may be provided in one surface or two or more electrodes having a least one polarity may be provided. 
         [0146]    The first electrode  218  may be surrounded by the insulating layer  217  so as to be electrically separated from the active layer  214  and the second conductivity-type semiconductor layer  216 . 
         [0147]    The first electrode  218  may be provided in a plurality of vias v formed in rows and columns. The amount of vias and contact areas of the vias v may be adjusted such that a planar area of the plurality of vias in contact with the first conductivity-type semiconductor layer  212  ranges from 1% to 5% of a planar area of the semiconductor laminate L. A radius of the via may range from 5 μm to 50 μm, and the number of vias may range from 1 to 50 per individual chip according to a width of the semiconductor laminate L. Although the number of vias may vary according to an area of an individual chip, preferably, a plurality of vias are provided. A distance between the vias v may range from 100 μm to 500 μm, and the vias may have a matrix structure including rows and columns. More appropriately, the distance between the vias may range from 150 μm to 450 μm. If the distance between the vias is smaller than 100 μm, the number of vias may increase, relatively reducing a light emitting area and lowering luminous efficiency. If the distance between the vias is greater than 500 μm, current spreading may suffer, degrading luminous efficiency. A depth of the via v may range from 0.5 μm to 5.0 μm, although it may vary according to a thickness of the second conductivity-type semiconductor layer  216  and the active layer  214 . 
         [0148]    Thereafter, as illustrated in  FIG. 22 , first and second connection electrodes  222  and  224  may be formed to be connected to electrode portions exposed through through holes H in a support structure  220 . 
         [0149]    In order to reduce contact resistance, the amount, a shape, a pitch, and a contact area with the first and second conductivity-type semiconductor layers  212  and  216  of the contact hole H may be appropriately regulated. The contact holes H may be arranged in various forms in rows and columns to improve a current flow. 
         [0150]    The support structure  220  may be a semiconductor substrate such as a silicon substrate, or may be formed of a curing resin containing highly reflective powder. 
         [0151]    The first and second connection electrodes  222  and  224  may extend to partial regions of a lower surface of the support structure  220  along the through holes H from exposed regions of the first and second electrodes  218  and  219 , so as to be connected to an external circuit from the lower surface of the support structure  220 . The first and second electrodes  222  and  224  may be formed by forming seed layers with a material such as nickel (Ni) or chromium (Cr) and performing a plating process thereon. The first and second electrodes  222  and  224  may be formed of a material such as gold (Au). During this process, the support structure  220  may be bonded to the semiconductor laminate L and the first and second electrodes  222  and  224  may be formed. 
         [0152]    Subsequently, as illustrated in  FIG. 23 , the wafer  201  used as a growth substrate may be separated from the semiconductor laminate L. 
         [0153]    This process may be implemented by using a laser lift-off process, but the present disclosure is not limited thereto and the wafer  201  may be removed through mechanical etching or chemical etching. 
         [0154]    Thereafter, as illustrated in  FIG. 24 , a wavelength conversion film  235  having marks  239  formed on a surface of the semiconductor laminate L from which the wafer  201  was removed, may be formed. 
         [0155]    The wavelength conversion film  235  may be formed of a resin containing a wavelength conversion material P such as a phosphor or a ceramic material containing a wavelength conversion material such as a phosphor. In a specific example, the wavelength conversion film  235  may be glass or an oxide film containing the wavelength conversion material P. In the present exemplary embodiment, the wavelength conversion film  235  is provided as a protective film, but in another exemplary embodiment, a protective film not using a wavelength conversion film may be used. For example, the wavelength conversion material may not be contained, or a resin, glass, an oxide film, or ceramics containing any other functional material may be used. 
         [0156]    The marks  239  may be asymmetrically arranged in an individual device region to indicate a direction of a chip, namely, positions of electrodes having particular polarities. The marks  239  may be configured such that they are readily recognized in the opposite surface of the wavelength conversion film  235 , although the marks  239  are positioned in the surface of the wavelength conversion film  235  in contact with the semiconductor laminate L. For example, in a case in which the wavelength conversion film  235  is configured as a resin film containing a wavelength conversion material P such as a phosphor or a quantum dot, the wavelength conversion film  235  may be transparent or translucent, and thus, the marks  239  may be easily recognized. Alternatively, if the wavelength conversion film  235  is formed of an opaque material, marks may be printed on a surface different from that of the present exemplary embodiment, or may be formed by using a structure such as a hole as that illustrated in  FIG. 1 . 
         [0157]    Subsequently, as illustrated in  FIG. 25 , an optical member  240  such as a lens may be formed on the wavelength conversion film  235  formed in the semiconductor laminate L, as needed. In this example, a convex lens is illustrated as an optical member, but various structures that may change an angle of beam spread may also be employed. The product illustrated in  FIG. 25  is cut into individual light emitting device units to obtain chip-scale package type semiconductor light emitting devices  200  as illustrated in  FIG. 26 . 
         [0158]    The semiconductor LED chip employed in various exemplary embodiments of the present disclosure may be an LED emitting blue light. Also, the wavelength conversion film described as an example of a protective film may convert a partial amount of blue light into at least one of yellow, green, red, and orange light, and may be mixed with unconverted blue light to emit white light. 
         [0159]    Meanwhile, when the semiconductor LED chip emits ultraviolet light, the wavelength conversion film may include phosphors emitting blue, green, and red light. In this case, a light emitting device may control a color rendering index (CRI) to range from a sodium-vapor (Na) lamp (CRI 40) to sunlight (CRI 100), or the like. Also, the light emitting device may control a color temperature ranging from 2000K to 20000K level to generate various levels of white light. If necessary, the light emitting device may generate visible light having purple, blue, green, red, orange colors, or infrared light to adjust an illumination color according to a surrounding atmosphere or mood. Also, the light emitting device may generate light having a special wavelength stimulating plant growth. 
         [0160]    White light generated by combining yellow, green, red phosphors to a blue LED and/or combining at least one of a green LED and a red LED thereto may have two or more peak wavelengths and may be positioned in a segment linking (x, y) coordinates (0.4476, 0.4074), (0.3484, 0.3516), (0.3101, 0.3162), (0.3128, 0.3292), (0.3333, 0.3333) of a CIE 1931 chromaticity diagram illustrated in  FIG. 27 . Alternatively, white light may be positioned in a region surrounded by a spectrum of black body radiation and the segment. A color temperature of white light corresponds to a range from about 2000K to about 20000K. 
         [0161]    Phosphors may have the following empirical formula and colors. 
         [0162]    Oxide-based phosphors: Yellow and green Y 3 Al 5 O 12 :Ce, Tb 3 Al 5 O 12 :Ce, Lu 3 Al 5 O 12 :Ce. 
         [0163]    Silicate-based phosphors: Yellow and green (Ba,Sr) 2 SiO 4 :Eu, yellow and orange (Ba,Sr) 3 SiO 5 :Ce. 
         [0164]    Nitride-based phosphors: Green β-SiAlON:Eu, yellow La 3 Si 6 O 11 :Ce, orange α-SiAlON:Eu, red CaAlSiN 3 , Sr 2 Si 5 N 8 :Eu, SrSiAl 4 N 7 :Eu. 
         [0165]    Fluoride-based phosphors: KSF-based red K 2 SiF 6 :Mn 4+ . 
         [0166]    Phosphor compositions should be basically conformed with stoichiometry, and respective elements may be substituted with different elements of respective groups of the periodic table. For example, strontium (Sr) may be substituted with barium (Ba), calcium (Ca), magnesium (Mg), or the like, of alkali earths, and yttrium (Y) may be substituted with terbium (Tb), Lutetium (Lu), scandium (Sc), gadolinium (Gd), or the like. Also, europium (Eu), an activator, may be substituted with cerium (Ce), terbium (Tb), praseodymium (Pr), erbium (Er), ytterbium (Yb), or the like, according to a desired energy level, and an activator may be applied alone, or a coactivator, or the like, may be additionally applied to change characteristics. 
         [0167]    Also, materials such as quantum dots, or the like, may be applied as materials that replace phosphors, and phosphors and quantum dots may be used in combination or alone in an LED. 
         [0168]    A quantum dot may have a structure including a core (3 nm to 10 nm) such as CdSe, InP, or the like, a shell (0.5 nm to 2 nm) such as ZnS, ZnSe, or the like, and a ligand for stabilizing the core and the shell, and may implement various colors according to sizes. 
         [0169]    Table 1 below shows types of phosphors in applications fields of white light emitting devices using a blue LED (wavelength: 440 nm to 460 nm). 
         [0000]    
       
         
               
               
               
             
           
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Purpose 
                 Phosphors 
               
               
                   
                   
               
             
             
               
                   
                 LED TV BLU 
                 β-SiAlON:Eu 2+   
               
               
                   
                   
                 (Ca,Sr)AlSiN 3 :Eu 2+   
               
               
                   
                   
                 La 3 Si 6 O 11 :Ce3 +   
               
               
                   
                   
                 K 2 SiF 6 :Mn 4+   
               
               
                   
                 Lighting Devices 
                 Lu 3 Al 5 O 12 :Ce 3+   
               
               
                   
                   
                 Ca-α-SiAlON:Eu 2+   
               
               
                   
                   
                 La 3 Si 6 N 11 :Ce 3+   
               
               
                   
                   
                 (Ca,Sr)AlSiN 3 :Eu 2+   
               
               
                   
                   
                 Y 3 Al 5 O 12 :Ce 3+   
               
               
                   
                   
                 K 2 SiF 6 :Mn 4+   
               
               
                   
                 Side Viewing 
                 Lu 3 Al 5 O 12 :Ce 3+   
               
               
                   
                 (Mobile, Notebook PC) 
                 Ca-α-SiAlON:Eu 2+   
               
               
                   
                   
                 La 3 Si 6 N 11 :Ce 3+   
               
               
                   
                   
                 (Ca,Sr)AlSiN 3 :Eu 2+   
               
               
                   
                   
                 Y 3 Al 5 O 12 :Ce 3+   
               
               
                   
                   
                 (Sr,Ba,Ca,Mg) 2 SiO 4 :Eu 2+   
               
               
                   
                   
                 K 2 SiF 6 :Mn 4+   
               
               
                   
                 Electrical Components 
                 Lu 3 Al 5 O 12 :Ce 3+   
               
               
                   
                 (Vehicle Head Lamp, etc.) 
                 Ca-α-SiAlON:Eu 2+   
               
               
                   
                   
                 La 3 Si 6 N 11 :Ce 3+   
               
               
                   
                   
                 (Ca,Sr)AlSiN 3 :Eu 2+   
               
               
                   
                   
                 Y 3 Al 5 O 12 :Ce 3+   
               
               
                   
                   
                 K 2 SiF 6 :Mn 4+   
               
               
                   
                   
               
             
          
         
       
     
         [0170]    Phosphors or quantum dots may be applied by using at least one of a method of spraying them on a light emitting device, a method of covering as a film, and a method of attaching as a sheet of ceramic phosphor, or the like. 
         [0171]    As the spraying method, dispensing, spray coating, or the like, is generally used, and dispensing includes a pneumatic method and a mechanical method such as a screw fastening scheme, a linear type fastening scheme, or the like. Through a jetting method, an amount of dotting may be controlled through a very small amount of discharging and color coordinates (or chromaticity) may be controlled therethrough. In the case of a method of collectively applying phosphors on a wafer level or on a mounting board on which an LED is mounted, productivity can be enhanced and a thickness can be easily controlled. 
         [0172]    The method of directly covering a light emitting device with phosphors or quantum dots as a film may include electrophoresis, screen printing, or a phosphor molding method, and these methods may have a difference according to whether a lateral surface of a chip is required to be coated or not. 
         [0173]    In order to control efficiency of a long wavelength light emitting phosphor re-absorbing light emitted in a short wavelength, among two types of phosphors having different light emitting wavelengths, two types of phosphor layers having different light emitting wavelengths may be provided, and in order to minimize re-absorption and interference of chips and two or more wavelengths, a DBR (ODR) layer may be included between respective layers. In order to form a uniformly coated film, after a phosphor is fabricated as a film or a ceramic form and attached to a chip or a light emitting device. 
         [0174]    In order to differentiate light efficiency and light distribution characteristics, a light conversion material may be positioned in a remote form, and in this case, the light conversion material may be positioned together with a material such as a light-transmissive polymer, glass, or the like, according to durability and heat resistance. 
         [0175]    A phosphor applying technique plays the most important role in determining light characteristics in an LED device, so techniques of controlling a thickness of a phosphor application layer, a uniform phosphor distribution, and the like, have been variously researched. 
         [0176]    A quantum dot (QD) may also be positioned in a light emitting device in the same manner as that of a phosphor, and may be positioned in glass or a light-transmissive polymer material to perform optical conversion. 
         [0177]    The light emitting devices as described above are illustrated as a package including a LED chip, but the present inventive concept is not limited thereto. For example, the light emitting devices may be LED chip itself. In this case, the LED chip can be mounted on a board and electrically connected to the board by using a chip bonding or a wire bonding. This may be called as COB (Chip on Board). 
         [0178]      FIGS. 28 and 29  are views illustrating examples of a semiconductor light emitting device and a backlight unit employing a package thereof according to an exemplary embodiment of the present disclosure. 
         [0179]    Referring to  FIG. 28 , a backlight unit  1000  includes light sources  1001  mounted on a substrate  1002  and one or more optical sheets  1003  disposed above the light sources  1001 . The aforementioned semiconductor light emitting device or a package employing the semiconductor light emitting device may be used as the light sources  1001 . 
         [0180]    Unlike the backlight unit  1000  in  FIG. 28  in which the light sources  1001  emit light toward an upper side on which a liquid crystal display is disposed, a backlight unit  2000  as another example illustrated in  FIG. 29  is configured such that light sources  2001  mounted on a substrate  2002  emit light in a lateral direction, and the emitted light may be made to be incident to a light guide plate  2003  so as to be converted into a surface light source. Light, passing through the light guide plate  2003 , is emitted upwards, and in order to enhance light extraction efficiency, a reflective layer  2004  may be disposed on a lower surface of the light guide plate  2003 . 
         [0181]      FIG. 30  is a view illustrating an example of a semiconductor light emitting device according to an exemplary embodiment of the present disclosure. 
         [0182]    A lighting device  3000  is illustrated, for example, as a bulb-type lamp in  FIG. 21 , and includes a light emitting module  3003 , a driver  3008 , and an external connector  3010 . Also, the lighting device  3000  may further include external structures such as external and internal housings  3006  and  3009  and a cover  3007 . The light emitting module  3003  may include a light source  3001  having the aforementioned semiconductor light emitting device and a circuit board  3002  with the light source  3001  mounted thereon. For example, first and second electrodes of the aforementioned semiconductor light emitting device may be electrically connected to an electrode pattern of the circuit board  3002 . In the present exemplary embodiment, it is illustrated that a single light source  3001  is mounted on the circuit board  3020 , but a plurality of light sources may be mounted as needed. 
         [0183]    The external housing  3006  may serve as a heat dissipater and may include a heat dissipation plate  3004  disposed to be in direct contact with the light emitting module  3003  to enhance heat dissipation and heat dissipation fins  3005  surrounding the lateral surfaces of the lighting device  3000 . Also, the cover  3007  may be installed on the light emitting module  3003  and have a convex lens shape. The driver  3008  is installed in the internal housing  3009  and connected to the external connector  3010  having a socket structure to receive power from an external power source. Also, the driver  3008  may serve to convert power into an appropriate current source for driving the semiconductor light emitting device  3001  of the light emitting module  3003 , and provide the same. For example, the driver  3008  may be configured as an AC-DC converter, a rectifying circuit component, or the like. 
         [0184]      FIG. 31  is a view illustrating an example of an application of a semiconductor light emitting device or a package thereof according to an exemplary embodiment of the present disclosure to a head lamp. 
         [0185]    Referring to  FIG. 31 , a head lamp  4000  used as a vehicle lamp, or the like, may include a light source  4001 , a reflector  4005 , and a lens cover 4004 . The lens cover  4004  may include a hollow guide  4003  and a lens  4002 . The light source  4001  may include the aforementioned semiconductor light emitting device or a package including the semiconductor light emitting device. 
         [0186]    The head lamp  4000  may further include a heat dissipater  4012  outwardly dissipating heat generated by the light source  4001 . In order to effectively dissipate heat, the heat dissipater  4012  may include a heat sink  4010  and a cooling fan  4011 . Also, the head lamp  4000  may further include a housing  4009  fixedly supporting the heat dissipater  4012  and the reflector  4005 , and the housing  4009  may have a central hole  4008  formed in one surface thereof, in which the heat dissipater  4012  is coupled. 
         [0187]    Also, the housing  4009  may have a front hole  4007  formed in the other surface integrally connected to the one surface and bent in a right angle direction. The front hole  4007  may allow the reflector  4005  to be fixedly positioned above the light source  4001 . Accordingly, a front side is opened by the reflector  4005 , and the reflector  4005  is fixed to the housing  4009  such that the opened front side corresponds to the front hole  4007 , and light reflected by the reflector  4005  may pass through the front hole  4007  to be output outwardly. 
         [0188]    As set forth above, according to exemplary embodiments of the present disclosure, by adding marks to allow for recognition of a direction of a semiconductor LED chip, a defect in a follow-up process caused as electrodes are not properly connected when mounted on a board due to erroneous recognition of a direction of the electrodes may be prevented. Also, in a specific example, marks may be provided to a protective film member in advance, so as to be utilized as a reference for aligning semiconductor LED chips. 
         [0189]    Advantages and effects of the present disclosure are not limited to the foregoing content and any other technical effects not mentioned herein may be easily understood by a person skilled in the art from the foregoing description. 
         [0190]    While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the spirit and scope of the present disclosure as defined by the appended claims.