Patent Abstract:
A light-emitting device includes: a semiconductor light-emitting element; a substrate supporting the semiconductor light-emitting element; and a silicone elastomer layer located between the semiconductor light-emitting element and the substrate, wherein the semiconductor light-emitting element and the silicone elastomer layer are bonded together.

Full Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present invention relates to a light-emitting device, a method for manufacturing the same, and a projector. 
         [0003]    2. Related Art 
         [0004]    In recent years, the development of semiconductor light-emitting elements has been vigorously carried out. As specific semiconductor light-emitting elements, a semiconductor laser (Laser Diode), a super luminescent diode (hereinafter also referred to as “SLD”), an LED (Light-Emitting Diode), and the like have been known. 
         [0005]    In a light-emitting device including a semiconductor light-emitting element, the semiconductor light-emitting element is generally mounted on a support substrate such as a copper base. In such a light-emitting device, stress is sometimes generated in the semiconductor light-emitting element due to a difference in the coefficient of thermal expansion between the semiconductor light-emitting element and the support substrate because of, for example, heat generation at the time of driving the semiconductor light-emitting element, a change in ambient temperature caused by a change in environment in which the device is put, or the like. When the stress is generated in the semiconductor light-emitting element, the device cannot offer desired performance or the reliability of the device is lowered in some cases. 
         [0006]    For such problems, JP-A-2007-73549, for example, discloses a light-emitting device in which a semiconductor light-emitting element is mounted on a support substrate via a submount so that stress generated in the semiconductor light-emitting element due to a difference in the coefficient of thermal expansion between the semiconductor light-emitting element and the support substrate can be reduced. 
         [0007]    However, in the light-emitting device disclosed in JP-A-2007-73549, the semiconductor light-emitting element is bonded with solder such as AuSn. Since solder such as AuSn is hard (the modulus of elasticity is large), the deformation of the semiconductor light-emitting element isnot allowed when the semiconductor light-emitting element attempts to deform because of heat generation at the time of driving the semiconductor light-emitting element, a change in ambient temperature caused by a change in environment in which the device is put, or the like, and therefore, stress is sometimes generated in the semiconductor light-emitting element. 
       SUMMARY 
       [0008]    An advantage of some aspects of the invention is to provide a light-emitting device which can reduce stress generated in a semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element and a method for manufacturing the light-emitting device. Another advantage of some aspects of the invention is to provide a projector including the light-emitting device. 
         [0009]    An aspect of the invention is directed to a light-emitting device including: a semiconductor light-emitting element; a substrate supporting the semiconductor light-emitting element; and a silicone elastomer layer located between the semiconductor light-emitting element and the substrate, wherein the semiconductor light-emitting element and the silicone elastomer layer are bonded together. 
         [0010]    According to the light-emitting device, since the silicone elastomer layer is soft (the modulus of elasticity is small) compared to solder, the deformation of the semiconductor light-emitting element is not prevented when the semiconductor light-emitting element attempts to deform because of heat generation at the time of driving the semiconductor light-emitting element, a change in ambient temperature caused by a change in environment in which the device is put, or the like, and therefore, it is possible to suppress the generation of stress in the semiconductor light-emitting element. Accordingly, according to the light-emitting device, it is possible to reduce the stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. 
         [0011]    In the light-emitting device according to the aspect of the invention, the semiconductor light-emitting element and the silicone elastomer layer may be bonded together by activated bonding. 
         [0012]    According to the light-emitting device, it is possible, in the manufacturing process, to reduce thermal damage or physical damage applied to the semiconductor light-emitting element. In the light-emitting device according to the aspect of the invention, the semiconductor light-emitting element may be mounted on the substrate in a junction-down state. 
         [0013]    According to the light-emitting device, a heat dissipation property can be enhanced. 
         [0014]    In the light-emitting device according to the aspect of the invention, the semiconductor light-emitting element may be an edge-emitting semiconductor light-emitting element. 
         [0015]    According to the light-emitting device, it is possible to prevent a precursor of the silicone elastomer layer from adhering to a light-exiting portion of the semiconductor light-emitting element in, for example, bonding of the semiconductor light-emitting element with the silicone elastomer layer. Accordingly, even when an edge-emitting semiconductor light-emitting element is used as the semiconductor light-emitting element, it is possible to prevent the occurrence of problems, such as a reduction in the intensity of exiting light or the occurrence of abnormality in the shape of exiting light, due to the adherence of the precursor to the light-exiting portion. 
         [0016]    In the light-emitting device according to the aspect of the invention, the light-emitting device may further include a silicon substrate located between the silicone elastomer layer and the substrate. 
         [0017]    According to the light-emitting device, it is possible to reduce stress generated in the semiconductor light-emitting element due to a difference in the coefficient of thermal expansion between the semiconductor light-emitting element and the substrate. 
         [0018]    In the light-emitting device according to the aspect of the invention, the semiconductor light-emitting element may have an electrode disposed on a surface of the semiconductor light-emitting element, a wiring may be disposed on a surface of the substrate, the surface facing the surface of the semiconductor light-emitting element, and the electrode and the wiring may be electrically connected through a connecting portion configured to include a conductive material and a resin material. 
         [0019]    According to the light-emitting device, the electrode and the wiring can be electrically connected while reducing stress generated in the semiconductor light-emitting element. 
         [0020]    In the light-emitting device according to the aspect of the invention, the semiconductor light-emitting element may have an electrode disposed on a surface of the semiconductor light-emitting element, a wiring may be disposed on a surface of the silicon substrate, the surface facing the surface of the semiconductor light-emitting element, and the electrode and the wiring may be electrically connected through a connecting portion configured to include a conductive material and a resin material. 
         [0021]    According to the light-emitting device, the electrode and the wiring can be electrically connected while reducing stress generated in the semiconductor light-emitting element. Another aspect of the invention is directed to a method for manufacturing a light-emitting device, including: forming a silicone elastomer layer above a substrate; subjecting a surface of the silicone elastomer layer to activation treatment; and placing a semiconductor light-emitting element on the silicone elastomer layer. 
         [0022]    According to the method for manufacturing the light-emitting device, it is possible to obtain the light-emitting device which can reduce stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. Further, since the semiconductor light-emitting element and the silicone elastomer layer can be bonded together by activated bonding, it is possible, in the manufacturing process, to reduce thermal damage and physical damage applied to the semiconductor light-emitting element. 
         [0023]    It is noted that, in the descriptions concerning the invention, the term “above” may be used, for example, in a manner as “a specific element (hereafter referred to as “A”) is formed “above” another specific element (hereafter referred to as “B”).” In the descriptions concerning the invention, in the case of such an example, the term “above” is used, while assuming that it includes a case in which A is formed directly on B, and a case in which A is formed above B through another element. 
         [0024]    The method for manufacturing the light-emitting device according to the aspect of the invention may further include: patterning, after the forming of the silicone elastomer layer, the silicone elastomer layer so as to expose a wiring disposed between the substrate and the silicone elastomer layer; and arranging conductive paste on the exposed wiring, wherein in the placing of the semiconductor light-emitting element on the silicone elastomer layer, the semiconductor light-emitting element may be placed such that an electrode of the semiconductor light-emitting element and the wiring are connected via the conductive paste. 
         [0025]    According to the method for manufacturing the light-emitting device, the electrode and the wiring can be electrically connected while reducing stress generated in the semiconductor light-emitting element. 
         [0026]    In the method for manufacturing the light-emitting device according to the aspect of the invention, the forming of the silicone elastomer layer may include applying a precursor of the silicone elastomer layer above the substrate and curing the precursor by heat treatment to form the silicone elastomer layer. 
         [0027]    According to the method for manufacturing the light-emitting device, the semiconductor light-emitting element can be placed on the silicone elastomer layer in a state where the silicone elastomer layer is cured. Accordingly, in placing of the semiconductor light-emitting element on the silicone elastomer layer, it is possible to prevent the precursor of the silicone elastomer layer from adhering to a light-exiting portion of the semiconductor light-emitting element. 
         [0028]    Still another aspect of the invention is directed to a method for manufacturing a light-emitting device, including: forming a silicone elastomer layer above a silicon substrate; subjecting a surface of the silicone elastomer layer to activation treatment; placing a semiconductor light-emitting element on the silicone elastomer layer; and bonding the silicon substrate to a substrate. 
         [0029]    According to the method for manufacturing the light-emitting device, it is possible to obtain the light-emitting device which can reduce stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. Further, since the semiconductor light-emitting element and the silicone elastomer layer can be bonded together by activated bonding, it is possible, in the manufacturing process, to reduce thermal damage and physical damage applied to the semiconductor light-emitting element. 
         [0030]    The method for manufacturing the light-emitting device according to the aspect of the invention may further include: patterning, after the forming of the silicone elastomer layer, the silicone elastomer layer so as to expose a wiring disposed between the silicon substrate and the silicone elastomer layer; and arranging conductive paste on the exposed wiring, wherein in the placing of the semiconductor light-emitting element on the silicone elastomer layer, the semiconductor light-emitting element may be placed such that an electrode of the semiconductor light-emitting element and the wiring are connected via the conductive paste. 
         [0031]    According to the method for manufacturing the light-emitting device, the electrode and the wiring can be electrically connected while reducing stress generated in the semiconductor light-emitting element. 
         [0032]    In the method for manufacturing the light-emitting device according to the aspect of the invention, the forming of the silicone elastomer layer may include applying a precursor of the silicone elastomer layer above the silicon substrate and curing the precursor by heat treatment to form the silicone elastomer layer. 
         [0033]    According to the method for manufacturing the light-emitting device, the semiconductor light-emitting element can be placed on the silicone elastomer layer in a state where the silicone elastomer layer is cured. Accordingly, in placing of the semiconductor light-emitting element on the silicone elastomer layer, it is possible to prevent the precursor of the silicone elastomer layer from adhering to a light-exiting portion of the semiconductor light-emitting element. 
         [0034]    Yet another aspect of the invention is directed to a projector including: the light-emitting device according to the aspect of the invention; a light-modulating device modulating light emitted from the light-emitting device according to image information; and a projection device projecting an image formed by the light-modulating device. 
         [0035]    According to the projector, since the light-emitting device according to the aspect of the invention is included, it is possible to reduce stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0036]    The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
           [0037]      FIG. 1  is a cross-sectional view schematically showing a light-emitting device according to a first embodiment. 
           [0038]      FIG. 2  is a plan view schematically showing a semiconductor light-emitting element. 
           [0039]      FIG. 3  is a cross-sectional view schematically showing the semiconductor light-emitting element. 
           [0040]      FIG. 4  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first embodiment. 
           [0041]      FIG. 5  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first embodiment. 
           [0042]      FIG. 6  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first embodiment. 
           [0043]      FIG. 7  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first embodiment. 
           [0044]      FIG. 8  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first embodiment. 
           [0045]      FIG. 9  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first embodiment. 
           [0046]      FIG. 10  is a cross-sectional view schematically showing a light-emitting device according to a first modified example of the first embodiment. 
           [0047]      FIG. 11  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first modified example of the first embodiment. 
           [0048]      FIG. 12  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first modified example of the first embodiment. 
           [0049]      FIG. 13  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first modified example of the first embodiment. 
           [0050]      FIG. 14  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first modified example of the first embodiment. 
           [0051]      FIG. 15  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first modified example of the first embodiment. 
           [0052]      FIG. 16  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the first modified example of the first embodiment. 
           [0053]      FIG. 17  is a cross-sectional view schematically showing a second modified example of the manufacturing process of the light-emitting device according to the first embodiment. 
           [0054]      FIG. 18  is a cross-sectional view schematically showing the second modified example of the manufacturing process of the light-emitting device according to the first embodiment. 
           [0055]      FIG. 19  is a cross-sectional view schematically showing the second modified example of the manufacturing process of the light-emitting device according to the first embodiment. 
           [0056]      FIG. 20  is a cross-sectional view schematically showing a light-emitting device according to a second embodiment. 
           [0057]      FIG. 21  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the second embodiment. 
           [0058]      FIG. 22  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the second embodiment. 
           [0059]      FIG. 23  is a cross-sectional view schematically showing a light-emitting device according to a modified example of the second embodiment. 
           [0060]      FIG. 24  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the modified example of the second embodiment. 
           [0061]      FIG. 25  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the modified example of the second embodiment. 
           [0062]      FIG. 26  is a cross-sectional view schematically showing the manufacturing process of the light-emitting device according to the modified example of the second embodiment. 
           [0063]      FIG. 27  schematically shows a projector according to a third embodiment. 
       
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0064]    Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. 
       1. First Embodiment 
     1.1. Configuration of Light-Emitting Device 
       [0065]    First, the configuration of a light-emitting device according to a first embodiment will be described with reference to the drawings.  FIG. 1  is a cross-sectional view schematically showing the light-emitting device  100  according to the embodiment. In  FIG. 1 , a semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. As shown in  FIG. 1 , the light-emitting device  100  includes the semiconductor light-emitting element  10 , a substrate (hereinafter also referred to as “support substrate”)  20 , and a silicone elastomer layer  30 . 
         [0066]    As the semiconductor light-emitting element  10 , a semiconductor laser, an SLD (super luminescent diode), and an LED, for example, can be used. Especially an SLD can reduce speckle noise compared to a semiconductor laser, and achieve higher output compared to an LED. Therefore, an SLD is preferable when, for example, the light-emitting device  100  is used for a light source of a projector or the like.  FIG. 2  is a plan view schematically showing the semiconductor light-emitting element  10 .  FIG. 3  is a cross-sectional view schematically showing the semiconductor light-emitting element  10 , taken along line III-III of  FIG. 2 . In the following, the description will be made on the case where the semiconductor light-emitting element  10  is an edge-emitting SLD. 
         [0067]    As shown in  FIGS. 2 and 3 , the semiconductor light-emitting element  10  can have a substrate  102 , a first cladding layer  104 , an active layer  106 , a second cladding layer  108 , a contact layer  109 , a first electrode  112 , second electrodes  114 , and an insulating portion  120 . 
         [0068]    As the substrate  102 , a GaAs substrate of a first conductivity type (for example, n-type) or the like, for example, is used. The first cladding layer  104  is formed on the substrate  102 . As the first cladding layer  104 , an n-type InGaAlP layer or the like, for example, is used. 
         [0069]    The active layer  106  is formed on the first cladding layer  104 . The active layer  106  has, for example, a multi-quantum well (MQW) structure in which three quantum well structures each having an InGaP well layer and an InGaAlP barrier layer are stacked. In the example shown in  FIG. 2 , the active layer  106  has a first side surface  131  where light-exiting portions  11  are formed, and second side surfaces  132  and third side surfaces  133  which are inclined to the first side surface  131 . Portions of the active layer  106  constitute first gain regions  150 , second gain regions  160 , and third gain regions  170 . The gain regions  150 ,  160 , and  170  can generate light. This light can be guided within the gain regions  150 ,  160 , and  170  while experiencing gains. 
         [0070]    As shown in  FIG. 2 , the first gain region  150  is disposed from the second side surface  132  to the third side surface  133 . In the illustrated example, the first gain region  150  is disposed parallel to the first side surface  131 . 
         [0071]    The second gain region  160  is disposed from the second side surface  132  to the first side surface  131 . The second gain region  160  overlaps the first gain region  150  on the second side surface  132 . 
         [0072]    The third gain region  170  is disposed from the third side surface  133  to the first side surface  131 . The third gain region  170  overlaps the first gain region  150  on the third side surface  133 . 
         [0073]    In the light generated in the gain regions  150 ,  160 , and  170 , the reflectance of the first side surface  131  is lower than those of the second side surface  132  and the third side surface  133 . With this configuration, a connecting portion between the second gain region  160  and the first side surface  131 , and a connecting portion between the third gain region  170  and the first side surface  131  can each serve as the light-exiting portion  11 . Moreover, the side surfaces  132  and  133  can each serve as a reflecting surface. 
         [0074]    The gain regions  160  and  170  are connected to the first side surface  131  while being inclined to a normal P of the first side surface  131 . With this configuration, it is possible to prevent the direct multiple reflection of light generated in the gain regions  150 ,  160 , and  170  between an edge face on the first side surface  131  of the second gain region  160  and an edge face on the first side surface  131  of the third gain region  170 . As a result, since a resonator cannot be directly configured, laser oscillation of the light generated in the gain regions  150 ,  160 , and  170  can be suppressed or prevented. The gain regions  150 ,  160 , and  170  can constitute a gain region group  180 . In the semiconductor light-emitting element  10 , a plurality of gain region groups  180  are disposed. Although, in the illustrated example, two gain region groups  180  are disposed, the number of gain region groups is not particularly limited. 
         [0075]    The second cladding layer  108  is formed on the active layer  106 . As the second cladding layer  108 , an InGaAlP layer of a second conductivity type (for example, p-type) or the like, for example, is used. 
         [0076]    For example, the p-type second cladding layer  108 , the active layer  106  not doped with an impurity, and the n-type first cladding layer  104  constitute a pin diode. Each of the first cladding layer  104  and the second cladding layer  108  is a layer whose forbidden band width is larger and whose refractive index is smaller than those of the active layer  106 . The active layer  106  has functions of generating light and guiding the light while amplifying the light. The first cladding layer  104  and the second cladding layer  108  have a function of interposing the active layer  106  therebetween to confine injected carriers (electrons and holes) and light (a function of suppressing light leakage). 
         [0077]    When the forward bias voltage of the pin diode is applied (a current is injected) between the first electrode  112  and the second electrode  114 , the semiconductor light-emitting element  10  generates the gain regions  150 ,  160 , and  170  in the active layer  106 , and the recombination of electrons and holes occurs in the gain regions  150 ,  160 , and  170 . This recombination causes light emission. With this generated light as a starting point, stimulated emission occurs successively, so that the intensity of light is amplified within the gain regions  150 ,  160 , and  170 . Then, the light whose intensity is amplified is emitted from the light-exiting portion  11  as light L. That is, in the illustrated example, the semiconductor light-emitting element  10  is an edge-emitting semiconductor light-emitting element. 
         [0078]    The contact layer  109  and a portion of the second cladding layer  108  can constitute a columnar portion  122 . The planar shape of the columnar portion  122  is the same as that of the gain regions  150 ,  160 , and  170 . That is, it can be said that the planar shape of an upper surface of the contact layer  109  is the same as that of the gain regions  150 ,  160 , and  170 . For example, a current path between the electrodes  112  and  114  is determined by the planar shape of the columnar portion  122 , and as a result, the planar shape of the gain regions  150 ,  160 , and  170  is determined. 
         [0079]    The insulating portion  120  is disposed lateral to the columnar portion  122  on the second cladding layer  108 . As the insulating portion  120 , a SiN layer, a SiO 2  layer, a SiON layer, an Al 2 O 3  layer, or a polyimide layer, for example, is used. 
         [0080]    When the material described above is used as the insulating portion  120 , a current between the electrodes  112  and  114  can avoid the insulating portion  120  to flow through the columnar portion  122  interposed between the insulating portions  120 . The insulating portion  120  can have a refractive index smaller than that of the active layer  106 . In this case, the effective refractive index of a vertical section of a portion where the insulating portion  120  is formed is smaller than that of a portion where the insulating portion  120  is not formed, that is, the effective refractive index of a vertical section of a portion where the columnar portion  122  is formed. With this configuration, light can be efficiently confined within the gain regions  150 ,  160 , and  170  in a planar direction. The first electrode  112  is formed on an entire lower surface of the substrate  102 . As the first electrode  112 , one obtained by stacking a Cr layer, an AuGe layer, a Ni layer, and an Au layer from the substrate  102  side in this order, for example, is used. 
         [0081]    The second electrode  114  is formed on the contact layer  109 . The planar shape of the second electrode  114  is, for example, the same as that of the gain regions  150 ,  160 , and  170 . As the second electrode  114 , one obtained by stacking a Cr layer, an AuZn layer, and an Au layer from the contact layer  109  side in this order, for example, is used. 
         [0082]    The semiconductor light-emitting element  10  is formed by semiconductor fabrication techniques such as a photolithographic technique and an etching technique. 
         [0083]    As shown in  FIG. 1 , the semiconductor light-emitting element  10  is mounted on the support substrate  20  in a junction-down state. That is, the semiconductor light-emitting element  10  is mounted such that the active layer  106  is located closer to the support substrate  20  side than the substrate  102  of the semiconductor light-emitting element  10 . In the example of  FIG. 1 , the semiconductor light-emitting element  10  is mounted with the second electrode  114  side being directed to the support substrate  20  (turned upside down from the example of  FIG. 3 ). Therefore, a first surface  19  as a surface of the semiconductor light-emitting element  10  faces a second surface (upper surface)  21  of the support substrate  20 . The first surface  19  of the semiconductor light-emitting element  10  is a surface on which the second electrodes  114  are formed and which is composed of the upper surface of the contact layer  109  and an upper surface  121  of the insulating portion  120  shown in  FIG. 3 . In the illustrated example, since the semiconductor light-emitting element  10  is an edge-emitting semiconductor light-emitting element, the light-exiting portion  11  of the semiconductor light-emitting element  10  is disposed on a surface perpendicular to the upper surface  21  of the support substrate  20 . Therefore, the exiting light L which is emitted from the light-exiting portion  11  proceeds in a direction along the upper surface  21  of the support substrate  20 . 
         [0084]    The support substrate  20  supports the semiconductor light-emitting element  10 . In the illustrated example, the support substrate  20  supports the semiconductor light-emitting element  10  via the silicone elastomer layer  30 . As the support substrate  20 , a plate-like member (rectangular parallelepiped-shaped member), for example, can be used. The support substrate  20  is formed of, for example, Cu, Al, Mo, W, Si, C, Be, or Au, or a compound (for example, AlN, BeO, or the like) or an alloy (for example, CuMo or the like) of them. Moreover, the support substrate  20  can also be composed of a combination of these examples, for example, a multi-layered structure of a copper (Cu) layer and a molybdenum (Mo) layer, or the like. The support substrate  20  can, for example, dissipate heat generated in the semiconductor light-emitting element  10 . 
         [0085]    On the upper surface  21  of the support substrate  20 , a first wiring  22  and second wirings  24  are disposed. In the illustrated example, the first wiring  22  and the second wirings  24  are disposed on the upper surface  21  of the support substrate  20  via an insulating layer  26 . The insulating layer  26  is a layer for electrically insulating the wirings  22  and  24  from each other. The insulating layer  26  is, for example, a silicon oxide layer or a silicon nitride layer. The first wiring  22  and the second wirings  24  are, for example, wirings for connecting the semiconductor light-emitting element  10  with a driving portion (not shown) for driving the semiconductor light-emitting element  10 . 
         [0086]    The first wiring  22  is electrically connected with the first electrode  112  of the semiconductor light-emitting element  10  through, for example, a wiring wire  40 . Although not shown in the drawing, the first wiring  22  may be electrically connected with the first electrode  112  through a connecting portion  42 , similarly to the second wiring  24  which will be described later, when the semiconductor light-emitting element  10  has a single-sided electrode structure in which the electrodes  112  and  114  are formed on the same surface side with respect to the substrate  102 . 
         [0087]    The second wiring  24  is electrically connected with the second electrode  114  of the semiconductor light-emitting element  10  through the connecting portion  42 . The second wiring  24  is disposed at a position facing the second electrode  114 . The planar shape of the second wiring  24  is, for example, the same as that of the second electrode  114 . In plan view, the second electrode  114  may be formed on the inner side of the outer edge of the second wiring  24 . In the illustrated example, a plurality of second wirings  24  are disposed in one-to-one correspondence with the plurality of second electrodes  114 . The connecting portion  42  is disposed between the second wiring  24  and the second electrode  114 . The connecting portion  42  is disposed, in plan view, in an overlapped region of the second electrode  114  with the second wiring  24 . The connecting portion  42  may be disposed in a portion of the overlapped region of the second electrode  114  with the second wiring  24 , or may be disposed in the entire overlapped region. The connecting portion  42  can conduct the heat generated in the semiconductor light-emitting element  10  to the support substrate  20 . The connecting portion  42  is disposed in a hole penetrating through the silicone elastomer layer  30  in its thickness direction. The planar shape of the hole is, for example, the same as that of the second electrode  114 . A plurality of connecting portions  42  are disposed in one-to-one correspondence with the plurality of second electrodes  114 . 
         [0088]    The connecting portion  42  is configured to include, for example, a conductive material and a resin material. Examples of the conductive material include, for example, silver (Ag), copper (Cu), and carbon (C). Examples of the resin material include, for example, a silicone resin, an epoxy resin, a phenol resin, and an acrylic resin. A silicone resin is compatible with the silicone elastomer layer  30 , and therefore is preferable as the resin material. The connecting portion  42  is formed by curing conductive paste including a conductive material and a resin material. Since the connecting portion  42  includes a resin material, the connecting portion  42  is soft (the modulus of elasticity is low) compared to, for example, the case of being formed only of a conductive material such as metal. Accordingly, by connecting the second wiring  24  and the second electrode  114  with the connecting portion  42 , the second electrode  114  and the wiring  24  can be electrically connected while reducing stress generated in the semiconductor light-emitting element  10  compared to, for example, the case where a connecting portion is formed only of a conductive material such as metal. 
         [0089]    The silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20 . Here, the case where the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20  can mean a state where at least a portion of the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20 . That is, it is defined that the case where the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20  includes also the case where a portion of the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20  and the other portion of the silicone elastomer layer  30  is not located between the semiconductor light-emitting element  10  and the support substrate  20 . In the illustrated example, an entirety of the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20 . 
         [0090]    The silicone elastomer layer  30  and the semiconductor light-emitting element  10  are bonded together by activated bonding. More specifically, an upper surface  31  of the silicone elastomer layer  30  and the upper surface  121  of the insulating portion  120  of the semiconductor light-emitting element  10  are bonded together by activated bonding. Here, the activated bonding is a technique of bonding by, for example, irradiating a bonding surface (in this case, the upper surface  31  of the silicone elastomer layer  30 ) with plasma, ultraviolet light, or the like to form a dangling bond (dangling bond in an atom) on the bonding surface and bringing this activated surface into contact with an object surface (in this case, the upper surface  121  of the insulating portion  120 ). Accordingly, the upper surface  31  of the silicone elastomer layer  30  and the upper surface  121  of the insulating portion  120  of the semiconductor light-emitting element  10  are directly bonded together without another member (adhesive or the like). An entirety of the upper surface  121  of the insulating portion  120  may be bonded with the upper surface  31  of the silicone elastomer layer  30 , or a portion of the upper surface  121  of the insulating portion  120  may be bonded with the upper surface  31  of the silicone elastomer layer  30 . 
         [0091]    The silicone elastomer layer  30  is a layer configured to include, for example, a silicone elastomer. For example, the silicone elastomer layer  30  may be composed only of a silicone elastomer. The silicone elastomer is a silicone which has a —Si—O—Si— bond in a molecule and is cured rubbery by the addition of a curing catalyst, such as a peroxide or a platinum compound, or cured by partial crystallization. Specifically, the material of the silicone elastomer layer  30  is, for example, polydimethylsiloxane, polysilsesquioxane, or the like. As the silicone elastomer layer  30 , a silicone manufactured by, for example, Momentive Performance Materials Japan LLC, part number TSE3221S can be used. The silicone elastomer layer  30  is soft (the modulus of elasticity is small) compared to solder such as AuSn. Therefore, in the light-emitting device  100 , since the semiconductor light-emitting element  10  and the silicone elastomer layer  30  are bonded together, the deformation of the semiconductor light-emitting element  10  is not prevented when the semiconductor light-emitting element  10  attempts to deform, and therefore, the generation of stress in the semiconductor light-emitting element  10  can be suppressed compared to the case where the semiconductor light-emitting element  10  and solder are bonded together. The film thickness of the silicone elastomer layer  30  is, for example, about 3 to 10 μm. By making the silicone elastomer layer  30  thin in this manner, heat generated in the semiconductor light-emitting element  10  can be easily conducted to the support substrate  20 . 
         [0092]    The light-emitting device  100  according to the embodiment has, for example, the following features. 
         [0093]    The light-emitting device  100  has the silicone elastomer layer  30  located between the semiconductor light-emitting element  10  and the support substrate  20 , and the semiconductor light-emitting element  10  is bonded with the silicone elastomer layer  30 . The silicone elastomer layer  30  is soft compared to, for example, solder such as AuSn. Therefore, the deformation of the semiconductor light-emitting element  10  is not prevented when the semiconductor light-emitting element  10  attempts to deform because of heat generation at the time of driving the semiconductor light-emitting element  10 , a change in ambient temperature caused by a change in environment in which the light-emitting device  100  is placed, or the like, and therefore, the generation of stress in the semiconductor light-emitting element  10  can be suppressed compared to the case where the semiconductor light-emitting element  10  and solder are bonded together. Accordingly, according to the light-emitting device  100 , it is possible to reduce stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. Therefore, when a change in temperature is caused by heat generation at the time of driving the semiconductor light-emitting element, a change in ambient temperature caused by a change in environment in which the device is placed, or the like, the device does not fail to offer desired performance or the reliability of the device is not reduced for example, so that the device can have high reliability. 
         [0094]    Moreover, since a submount is no more necessary in the light-emitting device  100 , it is possible to reduce the cost, for example. 
         [0095]    In the light-emitting device  100 , the semiconductor light-emitting element  10  and the silicone elastomer layer  30  are bonded together by activated bonding. With this configuration, the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together at a room temperature without applying heat. Moreover, the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together with a low load. Accordingly, it is possible, in the manufacturing process, to reduce the thermal damage and physical damage applied to the semiconductor light-emitting element. For example, when a semiconductor light-emitting element is bonded to a submount with solder such as AuSn, heat at 300° C. or more is necessary for the bonding. Therefore, the semiconductor light-emitting element is sometimes damaged by this heat. 
         [0096]    In the light-emitting device  100 , the semiconductor light-emitting element  10  is mounted on the support substrate  20  in a junction-down state. With this configuration, since the active layer  106  as a heat-generating source can be brought close to the support substrate  20 , the heat dissipation property can be enhanced. 
         [0097]    In the light-emitting device  100 , the semiconductor light-emitting element  10  is an edge-emitting semiconductor light-emitting element. In the light-emitting device  100 , since the semiconductor light-emitting element  10  and the silicone elastomer layer  30  are bonded together by activated bonding, the silicone elastomer layer  30  can be bonded to the semiconductor light-emitting element  10  in a state where the silicone elastomer layer  30  is cured. Accordingly, in bonding of the semiconductor light-emitting element  10  with the silicone elastomer layer  30 , it is possible to prevent a foreign substance such as a precursor of the silicone elastomer layer from adhering to the light-exiting portion  11  of the semiconductor light-emitting element  10 . Accordingly, in the light-emitting device  100 , even when an edge-emitting semiconductor light-emitting element is used as the semiconductor light-emitting element  10 , it is possible, for example, to prevent the occurrence of problems, such as a reduction in the intensity of the exiting light L or the occurrence of abnormality in the shape of the exiting light L due to a foreign substance. 
         [0098]    In the light-emitting device  100 , the second electrode  114  of the semiconductor light-emitting element  10  and the wiring  24  disposed on the support substrate  20  are connected through the connecting portion  42  configured to include a conductive material and a resin material. Since the connecting portion  42  includes a resin material, the connecting portion  42  is soft (the modulus of elasticity is small) compared to, for example, the case where a wiring is composed only of a conductive material such as metal. Therefore, compared to the case where a wiring is composed only of a conductive material such as metal, the second electrode  114  and the wiring  24  can be electrically connected while reducing the stress generated in the semiconductor light-emitting element  10 . 
       1.2. Method for Manufacturing Light-Emitting Device 
       [0099]    Next, a method for manufacturing the light-emitting device  100  according to the first embodiment will be described with reference to the drawings.  FIGS. 4 to 9  are cross-sectional views schematically showing the manufacturing process of the light-emitting device  100  according to the embodiment. In  FIG. 9 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. 
         [0100]    As shown in  FIG. 4 , the insulating layer  26  and the wirings  22  and  24  are formed on the upper surface  21  of the support substrate  20 . The insulating layer  26  is formed by, for example, a sputtering method, a CVD method, or the like. The first wiring  22  and the second wirings  24  are formed by, for example, depositing a conductive layer (not shown) and then patterning the conductive layer using a lithographic technique, an etching technique, and the like. The support substrate  20  on which the insulating layer  26  and the wirings  22  and  24  are formed previously may be used. 
         [0101]    Next, above the support substrate  20  (in the illustrated example, on the insulating layer  26  and on the wirings  22  and  24 ), a precursor  30   a  of the silicone elastomer layer  30  is applied. The precursor  30   a  is a liquid serving as a raw material for forming the silicone elastomer layer  30 , and includes a material constituting the silicone elastomer layer  30 . The application of the precursor  30   a  can be performed by, for example, a spin-coating method. This makes it possible to uniformly apply the precursor  30   a  on the insulating layer  26  and on the wirings  22  and  24 . Moreover, by the use of a spin-coating method, the film thickness of the silicone elastomer layer  30  can be easily controlled. Accordingly, the silicone elastomer layer  30  can be made thin, for example. As shown in  FIG. 5 , the precursor  30   a  is cured by heat treatment. For example, the precursor  30   a  is cured by putting the support substrate  20  having the precursor  30   a  applied thereon in a bake furnace and applying heat at about from 150° C. to 180° C. Next, a mask M is formed on the silicone elastomer layer  30 . The mask M is formed by applying a resist on the silicone elastomer layer  30 , curing the resist, and then patterning through exposure and a development process. 
         [0102]    As shown in  FIG. 6 , the silicone elastomer layer  30  is etched using the mask M as a mask. This makes it possible to pattern the silicone elastomer layer  30  into a desired shape. The silicone elastomer layer  30  is patterned so as to, for example, expose the first wiring  22  and the second wirings  24 . In the illustrated example, holes  43  are formed in the silicone elastomer layer  30  by patterning, and the second wiring  24  is exposed through the hole  43 . The etching of the silicone elastomer layer  30  is performed by, for example, dry etching. Next, the mask M is removed. 
         [0103]    As shown in  FIG. 7 , the surface (the upper surface  31 ) of the silicone elastomer layer  30  is subjected to activation treatment. Specifically, the activation treatment can be performed by subjecting the surface of the silicone elastomer layer  30  to, for example, plasma treatment at an atmospheric pressure. In the example shown in  FIG. 7 , plasma treatment is performed by irradiating the surface of the silicone elastomer layer  30  with plasma PL. Moreover, the activation treatment may be performed by irradiating the surface of the silicone elastomer layer  30  with ultraviolet light. Here, the activation treatment means to create a state where a dangling bond of a surface atom is exposed by removing an oxide film, deposits, or the like of a bonding surface (surface of the silicone elastomer layer). 
         [0104]    As shown in  FIG. 8 , conductive paste  42   a  is arranged on the second wirings  24 . Specifically, the conductive paste  42   a  is arranged on the second wirings  24  by applying the conductive paste  42   a  in the holes  43 . Moreover, the conductive paste  42   a  may be arranged on the second wirings  24  by, for example, transferring conductive paste which is previously patterned into a desired shape onto the second wirings  24 . The conductive paste  42   a  is configured to include, for example, a conductive material and a resin material. Examples of the conductive material include, for example, silver (Ag), copper (Cu), and carbon (C). Examples of the resin material include, for example, a silicone resin, an epoxy resin, a phenol resin, and an acrylic resin. 
         [0105]    As shown in  FIG. 9 , the semiconductor light-emitting element  10  is placed on the silicone elastomer layer  30 . Specifically, the semiconductor light-emitting element  10  is placed such that the second electrode  114  of the semiconductor light-emitting element  10  and the second wiring  24  are connected via the conductive paste  42   a . That is, the semiconductor light-emitting element  10  is flip-chip mounted in a junction-down state where the second electrode  114  is directed to the support substrate  20  side. The placement of the semiconductor light-emitting element  10  is performed using, for example, a flip chip bonder or the like. 
         [0106]    By placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 , the silicone elastomer layer  30  and the semiconductor light-emitting element  10  are bonded together by activated bonding. More specifically, the upper surface  31  of the silicone elastomer layer  30  and the upper surface  121  of the insulating portion  120  of the semiconductor light-emitting element  10  are bonded together by activated bonding. In addition to the upper surface  31  of the silicone elastomer layer  30 , the upper surface  121  of the insulating portion  120  of the semiconductor light-emitting element  10  may be subjected to activation treatment. This makes it possible to further increase the bonding strength between the silicone elastomer layer  30  and the semiconductor light-emitting element  10 . 
         [0107]    Moreover, after placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 , a load (bonding load) may be applied to the semiconductor light-emitting element  10 . That is, the semiconductor light-emitting element  10  may be pressed against the silicone elastomer layer  30 . Further, after placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 , heat at about from 150° C. to 180° C. may be applied. This makes it possible to further increase the bonding strength between the silicone elastomer layer  30  and the semiconductor light-emitting element  10 . 
         [0108]    As shown in  FIG. 1 , the conductive paste  42   a  is cured by heat treatment to form the connecting portion  42 . Next, the first wiring  22  and the first electrode  112  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . The process is performed by, for example, wire bonding or the like. 
         [0109]    Through the processes described above, the light-emitting device  100  can be manufactured. 
         [0110]    The method for manufacturing the light-emitting device  100  according to the embodiment has, for example, the following features. 
         [0111]    The method for manufacturing the light-emitting device  100  has the process of subjecting the surface of the silicone elastomer layer  30  to activation treatment and the process of placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 . That is, according to the method for manufacturing the light-emitting device  100 , the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together by activated bonding. With this configuration, the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together at a room temperature without applying heat. Further, the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together with a low load. Accordingly, it is possible, in the manufacturing process, to reduce damage applied to the semiconductor light-emitting element. 
         [0112]    According to the method for manufacturing the light-emitting device  100 , in the process of placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 , the semiconductor light-emitting element  10  is placed such that the second electrode  114  of the semiconductor light-emitting element  10  and the second wiring  24  are connected via the conductive paste  42   a . That is, the second electrode  114  of the semiconductor light-emitting element  10  and the second wiring  24  are connected through the connecting portion  42  including a conductive material and a resin material. With this configuration, the second electrode  114  and the second wiring  24  can be electrically connected while reducing stress generated in the semiconductor light-emitting element  10 . According to the method for manufacturing the light-emitting device  100 , the silicone elastomer layer  30  is formed by applying the precursor  30   a  of the silicone elastomer layer  30  above the support substrate  20  and curing the precursor  30   a  by heat treatment. Accordingly, since the semiconductor light-emitting element  10  can be placed on the cured silicone elastomer layer  30 , it is possible to prevent the precursor  30   a  of the silicone elastomer layer from adhering to the light-exiting portion  11  of the semiconductor light-emitting element  10  in bonding of the semiconductor light-emitting element  10  with the silicone elastomer layer  30 . 
       1.3. Modified Examples 
     1.3.1. First Modified Example 
       [0113]    Next, a modified example of the light-emitting device according to the first embodiment will be described with reference to the drawing.  FIG. 10  is a cross-sectional view schematically showing a light-emitting device  200  according to a first modified example of the first embodiment. In  FIG. 10 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. Hereinafter, in the light-emitting device  200 , members having functions similar to those of the constituent members of the light-emitting device  100  are denoted by the same reference and numeral signs, and the detailed description thereof is omitted. 
         [0114]    As shown in  FIG. 10 , the light-emitting device  200  is configured to include, addition to the constituent members of the light-emitting device  100 , a silicon substrate  210  located between the silicone elastomer layer  30  and the support substrate  20 . That is, in the light-emitting device  200 , the silicon substrate  210 , the silicone elastomer layer  30 , and the semiconductor light-emitting element  10  are arranged in this order above the support substrate  20 . 
         [0115]    In the light-emitting device  200 , the first wiring  22  and the second wirings  24  are formed on the silicon substrate  210  (an upper surface  211  of the silicon substrate  210 ). The first wiring  22  may be disposed on the support substrate  20 . The first wiring  22  is electrically connected with the first electrode  112  of the semiconductor light-emitting element  10  through, for example, the wiring wire  40 . The second wiring  24  is electrically connected with the second electrode  114  of the semiconductor light-emitting element  10  through the connecting portion  42 . 
         [0116]    In the illustrated example, the silicone elastomer layer  30  and the silicon substrate  210  are located between the semiconductor light-emitting element  10  and the support substrate  20 . Here, it is defined that the case where the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20  includes, not only the case where only the silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20 , but also the case where the silicone elastomer layer  30  and another member (in this case, the silicon substrate  210 ) are located between the semiconductor light-emitting element  10  and the support substrate  20 . 
         [0117]    The silicone elastomer layer  30  and the semiconductor light-emitting element  10  are bonded together by activated bonding. In the illustrated example, the silicone elastomer layer  30  is interposed between the upper surface  211  of the silicon substrate  210  and the first surface  19  as the surface of the semiconductor light-emitting element  10 . The upper surface  211  of the silicon substrate  210  and the first surface  19  of the semiconductor light-emitting element  10  face each other via the silicone elastomer layer  30 . 
         [0118]    The silicon substrate  210  is bonded to the support substrate  20 . The silicon substrate  210  and the support substrate  20  are bonded together with, for example, a bonding member  220  such as silver paste or heat-dissipating silicone. A difference between the thermal expansion coefficient (for example, linear expansion coefficient) of the silicon substrate  210  and the coefficient of thermal expansion of the semiconductor light-emitting element  10  is small compared to a difference between the thermal expansion coefficient of the support substrate  20  and the coefficient of thermal expansion of the semiconductor light-emitting element  10 . 
         [0119]    The light-emitting device  200  has, for example, the following features. 
         [0120]    The light-emitting device  200  can have the silicon substrate  210  located between the silicone elastomer layer  30  and the support substrate  20 . As described above, the difference between the thermal expansion coefficient of the silicon substrate  210  and the coefficient of thermal expansion of the semiconductor light-emitting element  10  is small compared to the difference between the thermal expansion coefficient of the support substrate  20  and the coefficient of thermal expansion of the semiconductor light-emitting element  10 . Accordingly, according to the light-emitting device  200 , it is possible to reduce stress generated in the semiconductor light-emitting element  10  due to the difference in the coefficient of thermal expansion between the semiconductor light-emitting element  10  and the support substrate  20 . Next, a method for manufacturing the light-emitting device  200  will be described with reference to the drawings.  FIGS. 11 to 16  are cross-sectional views schematically showing the manufacturing process of the light-emitting device  200 . In  FIG. 16 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. As shown in  FIG. 11 , the first wiring  22  and the second wirings  24  are formed on the upper surface  211  of the silicon substrate  210 . 
         [0121]    Next, the precursor  30   a  of the silicone elastomer layer  30  is applied on the silicon substrate  210  and on the wirings  22  and  24 . The application of the precursor  30   a  can be performed by, for example, a spin-coating method. 
         [0122]    As shown in  FIG. 12 , the precursor  30   a  is cured by heat treatment. For example, the precursor  30   a  is cured by putting the support substrate  20  having the precursor  30   a  applied thereon in a bake furnace and applying heat at about from 150° C. to 180° C. Next, the mask M is formed on the silicone elastomer layer  30 . The mask M is formed by applying a resist on the silicone elastomer layer  30 , curing the resist, and then patterning through exposure and a development process. 
         [0123]    As shown in  FIG. 13 , the silicone elastomer layer  30  is etched using the mask M as a mask. The silicone elastomer layer  30  is patterned so as to, for example, expose the first wiring  22  and the second wirings  24 . In the illustrated example, the holes  43  are formed in the silicone elastomer layer  30  by patterning, and the second wiring  24  is exposed through the hole  43 . Next, the mask M is removed. 
         [0124]    When the silicon substrate  210  is a wafer, the wafer may be cut into small pieces by dicing or the like after patterning the silicone elastomer layer  30 . 
         [0125]    As shown in  FIG. 14 , the surface (the upper surface  31 ) of the silicone elastomer layer  30  is subjected to activation treatment by the irradiation of the plasma PL. 
         [0126]    As shown in  FIG. 15 , the conductive paste  42   a  is arranged on the second wirings  24 . Specifically, the conductive paste  42   a  is arranged on the second wirings  24  by applying the conductive paste  42   a  in the holes  43 . 
         [0127]    As shown in  FIG. 16 , the semiconductor light-emitting element  10  is placed on the silicone elastomer layer  30 . Specifically, the semiconductor light-emitting element  10  is placed such that the second electrode  114  of the semiconductor light-emitting element  10  and the second wiring  24  are connected via the conductive paste  42   a . That is, the semiconductor light-emitting element  10  is flip-chip mounted in a junction-down state where the second electrode  114  is directed to the silicon substrate  210  side. 
         [0128]    By placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 , the upper surface  31  of the silicone elastomer layer  30  and the upper surface  121  of the insulating portion  120  of the semiconductor light-emitting element  10  are bonded together by activated bonding. 
         [0129]    As shown in  FIG. 10 , the conductive paste  42   a  is cured by heat treatment to form the connecting portion  42 . Next, the first wiring  22  and the first electrode  112  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . 
         [0130]    Next, the silicon substrate  210  is bonded with the support substrate  20 . The silicon substrate  210  and the support substrate  20  can be bonded together using, for example, the bonding member  220  such as silver paste or heat-dissipating silicone. 
         [0131]    Through the processes described above, the light-emitting device  200  can be manufactured. 
         [0132]    According to the method for manufacturing the light-emitting device  200 , since the wiring  22  and the silicone elastomer layer  30  can be formed on the silicon substrate  210 , the wirings  22  and  24  and the silicone elastomer layer  30  can be easily formed using known semiconductor manufacturing processes. 
         [0133]    The method for manufacturing the light-emitting device  200  has the process of subjecting the surface of the silicone elastomer layer  30  to activation treatment and the process of placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 . That is, according to the method for manufacturing the light-emitting device  200 , the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together by activated bonding. Accordingly, it is possible, in the manufacturing process, to reduce damage applied to the semiconductor light-emitting element. 
         [0134]    According to the method for manufacturing the light-emitting device  200 , in the process of placing the semiconductor light-emitting element  10  on the silicone elastomer layer  30 , the semiconductor light-emitting element  10  is placed such that the second electrode  114  of the semiconductor light-emitting element  10  and the second wiring  24  are connected via the conductive paste  42   a . That is, the second electrode  114  of the semiconductor light-emitting element  10  and the second wiring  24  are connected through the connecting portion  42  including a conductive material and a resin material. With this configuration, the second electrode  114  and the second wiring  24  can be electrically connected while reducing stress generated in the semiconductor light-emitting element  10 . According to the method for manufacturing the light-emitting device  200 , the silicone elastomer layer  30  is formed by applying the precursor  30   a  of the silicone elastomer layer  30  above the silicon substrate  210  and curing the precursor  30   a  by heat treatment. Accordingly, since the semiconductor light-emitting element  10  can be placed on the cured silicone elastomer layer  30 , it is possible to prevent the precursor  30   a  of the silicone elastomer layer from adhering to the light-exiting portion  11  of the semiconductor light-emitting element  10  in bonding of the semiconductor light-emitting element  10  with the silicone elastomer layer  30 . 
       1.3.2. Second Modified Example 
       [0135]    Next, a modified example of the method for manufacturing the light-emitting device  100  according to the first embodiment will be described with reference to the drawings.  FIGS. 17 to 19  are cross-sectional views schematically showing the modified example of the manufacturing process of the light-emitting device  100 . In  FIGS. 17 to 19 , the light-emitting device  100  is illustrated in a simplified manner for convenience sake. 
         [0136]    In the method for manufacturing the light-emitting device  100  according to the first embodiment described above, the silicone elastomer layer  30  is formed above the support substrate  20  (in the example of  FIG. 4 , on the insulating layer  26  and on the wirings  22  and  24 ), and thereafter, the silicone elastomer layer  30  is bonded to the semiconductor light-emitting element  10 . However, the silicone elastomer layer  30  may be formed above the semiconductor light-emitting element  10 , and thereafter, the silicone elastomer layer  30  may be bonded to the support substrate  20 . Hereinafter, the description will be made in detail. 
         [0137]    As shown in  FIG. 17 , the silicone elastomer layer  30  is formed on the surface (on the upper surface  121  of the insulating portion  120  and the second electrode  114 ) of the semiconductor light-emitting element  10  on the second electrode  114  side. The silicone elastomer layer  30  is formed by applying the precursor  30   a  of the silicone elastomer layer  30  on the surface of the semiconductor light-emitting element  10  on the second electrode  114  side and curing the precursor  30   a  by heat treatment. 
         [0138]    As shown in  FIG. 18 , the silicone elastomer layer  30  is patterned to expose the second electrodes  114  of the semiconductor light-emitting element  10 . Next, a surface  32  of the silicone elastomer layer  30  is subjected to activation treatment. Next, the conductive paste  42   a  is arranged on the second electrodes  114 . 
         [0139]    As shown in  FIG. 19 , the silicone elastomer layer  30  is placed on the support substrate  20  with the surface  32  of the silicone elastomer layer  30  being directed to the support substrate  20  side. With this configuration, the silicone elastomer layer  30  and the support substrate  20  are bonded together by activated bonding. In the illustrated example, the semiconductor light-emitting element  10  is flip-chip mounted on the support substrate  20  in a junction-down state. 
         [0140]    As shown in  FIG. 1 , the conductive paste  42   a  is cured by heat treatment to form the connecting portion  42 . Next, the first wiring  22  is formed, and the first wiring  22  and the first electrode  112  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . 
         [0141]    Through the processes described above, the light-emitting device  100  can be manufactured. 
         [0142]    According to the modified example, similarly to the method for manufacturing the light-emitting device  100  according to the first embodiment described above, it is possible, in the manufacturing process, to reduce damage applied to the semiconductor light-emitting element. 
       2. Second Embodiment 
     2.1. Configuration of Light-Emitting Device 
       [0143]    Next, the configuration of a light-emitting device according to a second embodiment will be described with reference to the drawing.  FIG. 20  is a cross-sectional view schematically showing the light-emitting device  300  according to the second embodiment. In  FIG. 20 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. Hereinafter, in the light-emitting device  300 , members having functions similar to those of the constituent members of the light-emitting device  100  are denoted by the same reference and numeral signs, and the detailed description thereof is omitted. 
         [0144]    In the example of the light-emitting device  100  described above as shown in  FIG. 1 , the semiconductor light-emitting element  10  is mounted on the support substrate  20  in a junction-down state. In contrast to this, in the light-emitting device  300  as shown in  FIG. 20 , the semiconductor light-emitting element  10  is mounted on the support substrate  20  in a junction-up state. That is, the semiconductor light-emitting element  10  is mounted such that the active layer  106  is located on the opposite side of the substrate  102  of the semiconductor light-emitting element from the support substrate  20  side (in the illustrated example, the upper side). 
         [0145]    In the light-emitting device  300 , the semiconductor light-emitting element  10  has a single-sided electrode structure. In the illustrated example, the electrodes  112  and  114  are formed on the upper surface side of the semiconductor light-emitting element  10 . For example, although not shown in the drawing, a single-sided electrode structure can be obtained by disposing a second contact layer (not shown) between the first cladding layer  104  and the substrate  102  shown in  FIG. 3 , exposing the second contact layer by dry etching or the like, and disposing the first electrode  112  on the second contact layer. As the second contact layer, an n-type GaAs layer or the like, for example, can be used. 
         [0146]    The first wiring  22  and the second wiring  24  are disposed on the upper surface  21  of the support substrate  20  via the insulating layer  26 . With the insulating layer  26 , the wirings  22  and  24  can be electrically insulated from each other. The first wiring  22  is electrically connected with the first electrode  112  through, for example, the wiring wire  40 . The second wiring  24  is electrically connected with the second electrode  114  of the semiconductor light-emitting element  10  through, for example, the wiring wire  40 . Although, in the illustrated example, one second electrode  114  is disposed in the semiconductor light-emitting element  10 , a plurality of second electrodes  114  may be disposed. Moreover, the wiring wire  40  and the second wiring  24  may be disposed for each of the plurality of second electrodes  114 . 
         [0147]    The silicone elastomer layer  30  is located between the semiconductor light-emitting element  10  and the support substrate  20 . The silicone elastomer layer  30  and the semiconductor light-emitting element  10  are bonded together by activated bonding. When the semiconductor light-emitting element  10  has a single-sided electrode structure, the upper surface  31  of the silicone elastomer layer  30  and a lower surface of the substrate  102  of the semiconductor light-emitting element  10 , for example, are bonded together by activated bonding. 
         [0148]    The light-emitting device  300  has, for example, the following features. 
         [0149]    According to the light-emitting device  300 , the semiconductor light-emitting element  10  can be mounted on the support substrate  20  in a junction-up state. 
         [0150]    The light-emitting device  300  has the silicone elastomer layer  30  located between the semiconductor light-emitting element  10  and the support substrate  20 , and the semiconductor light-emitting element  10  is bonded with the silicone elastomer layer  30 . Accordingly, similarly to the light-emitting device  100  described above, it is possible to reduce stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. 
       2.2. Method for Manufacturing Light-Emitting Device 
       [0151]    Next, a method for manufacturing the light-emitting device according to the second embodiment will be described with reference to the drawings.  FIGS. 21 and 22  are cross-sectional views schematically showing the manufacturing process of the light-emitting device  300 . In  FIG. 22 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. 
         [0152]    As shown in  FIG. 21 , the silicone elastomer layer  30  is formed on the support substrate  20 . The silicone elastomer layer  30  is formed by applying the precursor  30   a  of the silicone elastomer layer  30  on the support substrate  20  and curing the precursor  30   a  by heat treatment. 
         [0153]    Next, the upper surface  31  of the silicone elastomer layer  30  is subjected to activation treatment. In addition to the upper surface  31  of the silicone elastomer layer  30 , the lower surface of the substrate  102  of the semiconductor light-emitting element  10 , which is to be bonded with the upper surface  31  of the silicone elastomer layer  30 , may be subjected to activation treatment. 
         [0154]    As shown in  FIG. 22 , the semiconductor light-emitting element  10  is placed on the silicone elastomer layer  30 . In the illustrated example, the semiconductor light-emitting element  10  is mounted in a junction-up (face-up) state. That is, the semiconductor light-emitting element  10  is mounted on the support substrate  20  with the substrate  102  side of the semiconductor light-emitting element  10  being directed to the support substrate  20  side. 
         [0155]    As shown in  FIG. 20 , the wirings  22  and  24  are formed on the support substrate  20  via the insulating layer  26 . Specifically, portions of the silicone elastomer layer  30  are first removed to expose the support substrate  20 . Next, the insulating layer  26  and the wirings  22  and  24  are formed on the exposed support substrate  20 . The wirings  22  and  24  may be previously formed on the support substrate  20 . Moreover, the wirings  22  and  24  may be disposed by arranging a flexible substrate having the wirings  22  and  24  formed thereon on the support substrate  20 . 
         [0156]    Next, the first wiring  22  and the first electrode  112  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . Moreover, the second wiring  24  and the second electrode  114  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . The process is performed by, for example, wire bonding or the like. Through the processes described above, the light-emitting device  300  can be manufactured. 
         [0157]    The method for manufacturing the light-emitting device  300  according to the embodiment has, for example, the following features. 
         [0158]    According to the method for manufacturing the light-emitting device  300 , the semiconductor light-emitting element  10  can be mounted on the support substrate  20  in a junction-up state. According to the method for manufacturing the light-emitting device  300 , the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together by activated bonding. With this configuration, the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together at a room temperature without applying heat. Further, the semiconductor light-emitting element  10  and the silicone elastomer layer  30  can be bonded together with a low load. Accordingly, it is possible, in the manufacturing process, to reduce damage applied to the semiconductor light-emitting element. According to the method for manufacturing the light-emitting device  300 , since the semiconductor light-emitting element  10  can be placed on the cured silicone elastomer layer  30 , it is possible to prevent the precursor  30   a  of the silicone elastomer layer from adhering to the light-exiting portion  11  of the semiconductor light-emitting element  10  in bonding of the semiconductor light-emitting element  10  with the silicone elastomer layer  30 . 
       2.3. Modified Example 
       [0159]    Next, a modified example of the light-emitting device according to the second embodiment will be described with reference to the drawing.  FIG. 23  is a cross-sectional view schematically showing a light-emitting device  400  according to the modified example of the second embodiment. In  FIG. 23 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. Hereinafter, in the light-emitting device  400 , members having functions similar to those of the constituent members of the light-emitting devices  100 ,  200 , and  300  are denoted by the same reference and numeral signs, and the detailed description thereof is omitted. 
         [0160]    As shown in  FIG. 23 , the light-emitting device  400  is configured to include, in addition to the constituent members of the light-emitting device  300 , the silicon substrate  210  located between the silicone elastomer layer  30  and the support substrate  20 . That is, in the light-emitting device  400 , the silicon substrate  210 , the silicone elastomer layer  30 , and the semiconductor light-emitting element  10  are arranged in this order above the support substrate  20 . 
         [0161]    In the light-emitting device  400 , the first wiring  22  and the second wiring  24  are disposed on the support substrate  20  via the insulating layer  26 . The first wiring  22  and the second wiring  24  may be disposed on the silicon substrate  210 . The first wiring  22  is electrically connected with the first electrode  112  of the semiconductor light-emitting element  10  through, for example, the wiring wire  40 . The second wiring  24  is electrically connected with the second electrode  114  of the semiconductor light-emitting element  10  through, for example, the wiring wire  40 . 
         [0162]    In the illustrated example, the silicone elastomer layer  30  and the silicon substrate  210  are located between the semiconductor light-emitting element  10  and the support substrate  20 . The silicone elastomer layer  30  and the semiconductor light-emitting element  10  are bonded together by activated bonding. When the semiconductor light-emitting element  10  has a single-sided electrode structure, the upper surface  31  of the silicone elastomer layer  30  and the lower surface of the substrate  102  of the semiconductor light-emitting element  10 , for example, are bonded together by activated bonding. 
         [0163]    The silicon substrate  210  is bonded to the support substrate  20  with the bonding member  220 . 
         [0164]    The light-emitting device  400  has, for example, the following features. 
         [0165]    The light-emitting device  400  can have the silicon substrate  210  located between the silicone elastomer layer  30  and the support substrate  20 . As described above, the difference between the thermal expansion coefficient of the silicon substrate  210  and the coefficient of thermal expansion of the semiconductor light-emitting element  10  is small compared to the difference between the thermal expansion coefficient of the support substrate  20  and the coefficient of thermal expansion of the semiconductor light-emitting element  10 . Accordingly, according to the light-emitting device  400 , it is possible to reduce stress generated in the semiconductor light-emitting element  10  due to the difference in the coefficient of thermal expansion between the semiconductor light-emitting element  10  and the support substrate  20 . Next, a method for manufacturing the light-emitting device  400  will be described with reference to the drawings.  FIGS. 24 to 26  are cross-sectional views schematically showing the manufacturing process of the light-emitting device  400 . In  FIG. 26 , the semiconductor light-emitting element  10  is illustrated in a simplified manner for convenience sake. As shown in  FIG. 24 , the silicone elastomer layer  30  is formed on the silicon substrate  210 . The silicone elastomer layer  30  is formed by applying the precursor  30   a  of the silicone elastomer layer  30  on the silicon substrate  210  and curing the precursor  30   a  by heat treatment. 
         [0166]    Next, the upper surface  31  of the silicone elastomer layer  30  is subjected to activation treatment. 
         [0167]    As shown in  FIG. 25 , the semiconductor light-emitting element  10  is placed on the silicone elastomer layer  30 . In the illustrated example, the semiconductor light-emitting element  10  is mounted in a junction-up (face-up) state. That is, the semiconductor light-emitting element  10  is mounted on the silicon substrate  210  with the substrate  102  side of the semiconductor light-emitting element  10  being directed to the silicon substrate  210  side. 
         [0168]    As shown in  FIG. 26 , the silicon substrate  210  is bonded to the support substrate  20 . The silicon substrate  210  and the support substrate  20  can be bonded together using, for example, the bonding member  220  such as silver paste or heat-dissipating silicone. 
         [0169]    As shown in  FIG. 23 , the wirings  22  and  24  are formed on the support substrate  20  via the insulating layer  26 . The wirings  22  and  24  may be previously formed on the support substrate  20 . Moreover, the wirings  22  and  24  may be disposed by arranging a flexible substrate having the wirings  22  and  24  formed thereon on the support substrate  20 . 
         [0170]    Next, the first wiring  22  and the first electrode  112  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . Moreover, the second wiring  24  and the second electrode  114  of the semiconductor light-emitting element  10  are connected through the wiring wire  40 . The process is performed by, for example, wire bonding or the like. Through the processes described above, the light-emitting device  400  can be manufactured. 
       3. Third Embodiment 
       [0171]    Next, a projector according to a third embodiment will be described with reference to the drawing.  FIG. 27  schematically shows the projector  500  according to the third embodiment. In  FIG. 27 , a housing constituting the projector  500  is omitted for convenience sake. 
         [0172]    As shown in  FIG. 27 , the projector  500  includes a red light source  100 R, a green light source  100 G, and a blue light source  100 B which emit red light, green light, and blue light, respectively. As the light source of the projector  500 , the light-emitting device according to the embodiment of the invention can be used. In the following as shown in  FIG. 27 , an example will be described in which the light-emitting device  100  (the red light-emitting device  100 R, the green light-emitting device  100 G, and the blue light-emitting device  100 B) is used as the light source of the projector  500 . In  FIG. 27 , the light-emitting device  100  is illustrated in a simplified manner for convenience sake. 
         [0173]    The projector  500  further includes lens arrays  502 R,  502 G, and  502 B, transmissive liquid crystal light valves (light-modulating devices)  504 R,  504 G, and  504 B, and a projection lens (projection device)  508 . 
         [0174]    Lights emitted from the light sources  100 R,  100 G, and  100 B are incident on the respective lens arrays  502 R,  502 G, and  502 B. The incident surface of the lens array  502  is inclined at a predetermined angle to, for example, the optical axis of light emitted from the light source  100 . With this configuration, the optical axis of the light emitted from the light source  100  can be converted. Accordingly, the light emitted from the light source  100 , for example, can be perpendicular to the irradiated surface of the liquid crystal light valve  504 . Especially, as shown in  FIG. 2 , when the gain regions  160  and  170  of the semiconductor light-emitting element  10  are disposed so as to be inclined to the first side surface  131 , the light emitted from the light source (the semiconductor light-emitting element  10 )  100  proceeds while being inclined to the normal P of the first side surface  131 . Therefore, it is desirable that the incident surface of the lens array  502  is inclined at a predetermined angle as described above. The lens array  502  can have a convex curved surface on the liquid crystal light valve  504  side. With this configuration, the light whose optical axis is converted on the incident surface of the lens array  502  is condensed by the convex curved surface, or the diffusion angle of the light can be reduced. Accordingly, the liquid crystal light valve  504  can be irradiated with good uniformity. 
         [0175]    In this manner, the lens array  502  can control the optical axis of the light emitted from the light source  100  to condense the light. 
         [0176]    The lights condensed by the respective lens arrays  502 R,  502 G, and  502 B are incident on the respective liquid crystal light valves  504 R,  504 G, and  504 B. The liquid crystal light valves  504 R,  504 G, and  504 B each modulate the incident light according to image information. 
         [0177]    The three colored lights modulated by the respective liquid crystal light valves  504 R,  504 G, and  504 B are incident on a cross dichroic prism  506 . The cross dichroic prism  506  is formed by, for example, bonding four rectangular prisms to each other. In the inside of the cross dichroic prism  506 , a dielectric multilayer film which reflects red light and a dielectric multilayer film which reflects blue light are arranged in a cross shape. The three colored lights are combined by these dielectric multilayer films. 
         [0178]    The light combined by the cross dichroic prism  506  is incident on the projection lens  508  as a projection optical system. The projection lens  508  magnifies an image formed by the liquid crystal light valves  504 R,  504 G, and  504 B to project the image onto a screen (display surface)  510 . 
         [0179]    The projector  500  has the light-emitting device  100  which can reduce stress generated in the semiconductor light-emitting element due to a member bonded to the semiconductor light-emitting element. Accordingly, the projector  500  can have high reliability. 
         [0180]    In the example described above, a transmissive liquid crystal light valve is used as a light-modulating device. However, a light valve other than liquid crystal may be used, or a reflective light valve may be used. Examples of such light valves include, for example, a reflective liquid crystal light valve and a digital micromirror device. Moreover, the configuration of the projection optical system is appropriately changed depending on the kinds of light valves to be used. 
         [0181]    Moreover, by causing the light from the light source  100  to scan on a screen, the light source  100  can be also applied to a light source device of a scanning-type image display device (projector), such as of having scanning means, as an image forming device which displays a desired sized image on a display surface. 
         [0182]    The embodiments and modified examples described above are illustrative only, and the invention is not limited to them. For example, it is also possible to appropriately combine each of the embodiments with each of the modified examples. 
         [0183]    The invention includes a configuration (for example, a configuration having the same function, method, and result, or a configuration having the same advantage and effect) which is substantially the same as those described in the embodiments. Moreover, the invention includes a configuration in which a non-essential portion of the configurations described in the embodiments is replaced. Moreover, the invention includes a configuration providing the same operational effects as those described in the embodiments, or a configuration capable of achieving the same advantages. Moreover, the invention includes a configuration in which a publicly known technique is added to the configurations described in the embodiments. The entire disclosure of Japanese Patent Application No. 2011-250377, filed Nov. 16, 2011 is expressly incorporated by reference herein.

Technology Classification (CPC): 7