Light emitting device and method for manufacturing the same

According to one embodiment, a light emitting device includes a first base section, a light emitting section, and a first wiring section. The light emitting section is embedded on a first surface side of the first base section. The light emitting section includes a light emitting element. The first wiring section is provided on the first surface of the first base section. The first wiring section is connected to the light emitting element.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-062817, filed on Mar. 19, 2012; the entire contents of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a light emitting device and a method for manufacturing the same.

BACKGROUND

For the purpose of downsizing, there is a light emitting device including a chip-like semiconductor light emitting element (hereinafter simply referred to as light emitting element).

Such a light emitting device has been used in various applications such as the light source of an illumination device, the backlight source of an image display device, and the light source of a display device.

Thus, in addition to downsizing, there is demand for the development of a light emitting device capable of improving the volume productivity.

DETAILED DESCRIPTION

In general, according to one embodiment, a light emitting device includes a first base section, a light emitting section, and a first wiring section. The light emitting section is embedded on a first surface side of the first base section. The light emitting section includes a light emitting element. The first wiring section is provided on the first surface of the first base section. The first wiring section is connected to the light emitting element.

Embodiments will now be illustrated with reference to the drawings. In the drawings, similar components are labeled with like reference numerals, and the detailed description thereof is omitted appropriately.

FIGS. 1A and 1Bare schematic views illustrating a light emitting device according to a first embodiment. Here,FIG. 1Ais a schematic sectional view illustrating the light emitting device.FIG. 1Bis an arrow view taken along line A-A inFIG. 1A.

FIG. 2is a schematic sectional view illustrating a light emitting section.

As shown inFIGS. 1A and 1B, the light emitting device1includes a light emitting section20, a base section10(corresponding to an example of the first base section), and a wiring section5(corresponding to an example of the first wiring section).

The light emitting section20includes a light emitting element22. The light emitting section20is embedded on the surface4a(corresponding to an example of the first surface) side of the base section10(second base body4). The light emitting section20is embedded with the light emitting surface26bdirected to the opposite side from the surface4aside of the base section10. In this case, the surface of the light emitting section20on the opposite side from the light emitting surface26bis located on the same plane as the surface4a.

As shown inFIG. 2, the light emitting section20includes a light emitting element22, a translucent section26, an insulating section27, a first electrode section28a, a second electrode section28b, and a sealing section32.

The light emitting element22can be e.g. a light emitting diode.

In this case, the light emitting element22includes e.g. a first semiconductor layer23, a light emitting layer24provided on the first semiconductor layer23, and a second semiconductor layer25provided on the light emitting layer24.

The first semiconductor layer23is a layer formed from e.g. a semiconductor doped into p-type (p-type semiconductor).

The light emitting layer24has e.g. a quantum well structure composed of a well layer in which holes and electrons are recombined to generate light, and a barrier layer having a larger band gap than the well layer.

The second semiconductor layer25is a layer formed from e.g. a semiconductor doped into n-type (n-type semiconductor).

In the case where the light emitting element22is a blue light emitting diode that emits blue light, the semiconductor is e.g. a nitride semiconductor.

The light emitting surface22aof the light emitting element22is provided with an uneven portion22a1.

The uneven portion22a1scatters the light emitted from the light emitting element22. This can increase the efficiency of extracting the light generated in the light emitting element22.

The translucent section26is provided on the surface22aof the light emitting element22. The translucent section26includes a translucent material and a phosphor26a.

The phosphor26ais particulate. The phosphor26aabsorbs part of the light emitted from the light emitting element22and emits fluorescence having a prescribed wavelength.

For instance, the phosphor26acan absorb part of blue light emitted from the light emitting element22and emit yellow fluorescence. In this case, for instance, blue light not absorbed by the phosphor26aand yellow fluorescence emitted from the phosphor26aare emitted from the translucent section26.

It is possible to use one kind of phosphor. Alternatively, it is also possible to use a plurality of kinds of phosphor in combination.

For instance, for blue light emitted from the light emitting element22, it is possible to use only a phosphor emitting yellow fluorescence. Alternatively, for blue light emitted from the light emitting element22, it is also possible to use a phosphor emitting red fluorescence and a phosphor emitting green fluorescence in combination. In this case, blue light, red light, and green light are emitted from the translucent section26.

Examples of the material of the phosphor emitting yellow fluorescence can include the following. However, the phosphor emitting yellow fluorescence is not limited thereto, but can be appropriately modified.

Examples of the material of the phosphor emitting red fluorescence can include the following. However, the phosphor emitting red fluorescence is not limited thereto, but can be appropriately modified.

Examples of the material of the phosphor emitting green fluorescence can include the following. However, the phosphor emitting green fluorescence is not limited thereto, but can be appropriately modified.

The kind and combination of the colors of fluorescence emitted by the phosphor are not limited to those illustrated, but can be appropriately modified depending on the purpose and the like of the light emitting device1.

The phosphor26ais not necessarily needed, but can be appropriately provided depending on the purpose and the like of the light emitting device1. In the case where the phosphor26ais not provided, the light emitted from the light emitting element22is emitted via the translucent section26.

The insulating section27is provided so as to cover the surface22bon the opposite side from the light emitting side of the light emitting element22.

The insulating section27can be formed from e.g. SiO2(silicon oxide).

The first electrode section28aincludes e.g. a first seed section29a, a first electrode wiring30a, and a first pillar section31a.

The second electrode section28bincludes e.g. a second seed section29b, a second electrode wiring30b, and a second pillar section31b.

An electrode, not shown, provided on the surface of the first semiconductor layer23is connected to the first pillar section31avia the first seed section29aand the first electrode wiring30a. An electrode, not shown, provided on the surface of the second semiconductor layer25is connected to the second pillar section31bvia the second seed section29band the second electrode wiring30b.

That is, the first electrode section28ais an extraction electrode connected to the electrode, not shown, provided on the first semiconductor layer23. The second electrode section28bis an extraction electrode connected to the electrode, not shown, provided on the second semiconductor layer25.

The first seed section29a, the first electrode wiring30a, the first pillar section31a, the second seed section29b, the second electrode wiring30b, and the second pillar section31bcan be formed from e.g. a metal such as copper, gold, nickel, and silver. In this case, in view of e.g. thermal conductivity, migration resistance, and adhesiveness to the sealing section32, these sections are preferably formed from copper.

The sealing section32includes a first sealing section32aand a second sealing section32b.

The first sealing section32ais provided so as to cover the surface22bside and the side surface22cside of the light emitting element22.

The second sealing section32bis provided so as to cover the first electrode wiring30a, the first pillar section31a, the second electrode wiring30b, and the second pillar section31b.

However, the end surface31a1of the first pillar section31aand the end surface31b1of the second pillar section31bare exposed from the second sealing section32b.

The first sealing section32aand the second sealing section32bcan be formed from e.g. an organic material or inorganic material having insulating property. In this case, the first sealing section32a, the second sealing section32b, and the insulating section27can be integrally formed.

The thickness of the first pillar section31a, the second pillar section31b, and the second sealing section32bcan be thickened. Then, even if the thickness of the light emitting element22is thin, the decrease of mechanical strength of the light emitting element22can be compensated.

The base section10includes a first base body2, a bonding section3(corresponding to an example of the first bonding section), and a second base body4.

The first base body2is plate-like and translucent. The surface2aof the first base body2can be provided with an uneven portion, not shown, or a diffusing layer (e.g., a layer made of resin containing fine particles), not shown, for diffusing the emitted light.

The first base body2can be formed from e.g. a translucent material. The translucent material is e.g. an organic material such as translucent resin, or an inorganic material such as glass. For instance, the translucent resin can be made similar to that illustrated in the translucent section26.

The bonding section3is provided on the first base body2. The bonding section3is translucent. The bonding section3bonds the first base body2to the light emitting section20and the second base body4. The bonding section3is formed by e.g. curing a transparent adhesive.

The refractive index of the first base body2, the refractive index of the bonding section3, and the refractive index of the translucent section26can be made comparable.

If these refractive indices are made comparable, reflection at the interface between the first base body2and the bonding section3and at the interface between the translucent section26and the bonding section3can be suppressed. This can increase the light extraction efficiency.

Furthermore, the refractive index of the first base body2, the refractive index of the bonding section3, the refractive index of the second base body4, and the refractive index of the translucent section26can be made comparable. This can further increase the light extraction efficiency.

The second base body4is provided on the bonding section3, and embeds the light emitting section20. That is, the light emitting section20is embedded inside the second base body4. This can suppress tilting of the light emitting section20with respect to the surface2aof the first base body2.

The end surface31a1of the first pillar section31aand the end surface31b1of the second pillar section31bare exposed from the surface4aof the second base body4. The light emitting surface26bof the translucent section26is exposed from the other surface4bof the second base body4. In the case where the second base body4is translucent, the light emitting surface26bof the translucent section26may not be exposed from the surface4bof the second base body4.

The second base body4can be translucent. If the second base body4is translucent, the light emitted from the side surface side of the light emitting section20can be transmitted. This can suppress narrowing of the directivity of the light emitting section20. As a result, the uniformity of the intensity of the light emitted from the light emitting device1can be improved. Furthermore, in the case where the light emitting device1is a surface emitting module used in e.g. an illumination device, the second base body4being translucent can suppress illumination unevenness.

The second base body4being translucent can be formed from e.g. a translucent material illustrated in the first base body2.

Alternatively, the second base body4can be made reflective. If the second base body4is reflective, the light emitted from the side surface side of the light emitting section20can be reflected. This can narrow the directivity of the light emitting section20. That is, mixing of light between the adjacent light emitting sections20can be suppressed. For instance, in the case where the light emitting device1is used in e.g. a device for displaying characters and images, the second base body4being reflective can make the display clear.

The second base body4being reflective can be formed from e.g. a white resin, a resin added with a reflective material such as metal, or a metal.

Thus, the material of the second base body4can be appropriately selected depending on the purpose and the like of the light emitting device1. Thus, the directivity of the light emitting section20can be changed.

The wiring section5is provided on the surface4aof the base section10. The wiring section5is electrically connected to the end surface31a1and the end surface31b1. That is, the wiring section5is connected to the light emitting element22. The wiring section5can be connected to e.g. an external power supply, not shown. The wiring section5can be formed from a metal such as copper, aluminum, and silver. The surface5aof the wiring section5can be provided with an oxidation resistant film, not shown. The oxidation resistant film, not shown, can be e.g. a nickel/gold stacked film. The wiring section5can be provided so that the light emitting sections20are series connected. Alternatively, the wiring section5can be provided so that the light emitting sections20are parallel connected.

In the example illustrated inFIG. 1B, a plurality of light emitting sections20are provided. The wiring section5is provided for each region between the light emitting sections20. The wiring section5is provided so as to cover the region between the light emitting sections20. The wiring sections5provided between the light emitting sections20are provided on the same plane. The wiring sections5provided on the same plane facilitate mounting the light emitting device1on another apparatus.

The surface5aof the wiring section5is exposed. The surface5aof the wiring section5being exposed can improve the dissipation performance of heat from the light emitting sections20. Furthermore, the wiring section5is planar. The wiring section5being planar can further improve the dissipation performance of heat from the light emitting sections20. Furthermore, this facilitates providing e.g. a heat dissipation fin6on the wiring section5.

The cross-sectional area of the end surface31a1and the end surface31b1is small. Thus, in typical mounting, solder having a small cross-sectional area is interposed between the end surface31a1,31b1and the wiring section. This increases heat resistance in this portion.

In contrast, in this embodiment, the end surface31a1and the end surface31b1are directly connected to the wiring section5. Thus, solder having a small cross-sectional area is not interposed between the end surface31a1,31b1and the wiring section5. This can suppress the increase of heat resistance.

The first pillar section31a, the second pillar section31b, and the second sealing section32bof the light emitting section20can be omitted. In the case where the first pillar section31a, the second pillar section31b, and the second sealing section32bare not provided, the wiring section5may be electrically connected to the first electrode wiring30aand the second electrode wiring30b. Omitting the first pillar section31a, the second pillar section31b, and the second sealing section32bcan further reduce the heat resistance.

The light emitting device1illustrated inFIGS. 1A and 1Bincludes a plurality of light emitting sections20. However, the number of light emitting sections20may be one. The layout and the like of the light emitting sections20are not limited to those illustrated inFIGS. 1A and 1B, but can be appropriately modified.

Furthermore, after producing a light emitting device including a plurality of light emitting sections20, this can be cut to obtain a light emitting device including a desired number of light emitting sections20.

In the light emitting device1according to this embodiment, formation of the base section10, provision of the light emitting section20on the base section10, and wiring of the light emitting section20, for instance, can be performed in a sequence of process steps. This can improve the volume productivity.

Furthermore, the light emitting section20is embedded inside the second base body4. This can suppress tilting of the light emitting section20with respect to the first base body2in the volume production of the light emitting device1.

Furthermore, the wiring section5having a prescribed configuration is provided. Thus, the heat dissipation performance can also be improved.

FIGS. 3A and 3Bare schematic views illustrating a light emitting device according to a second embodiment. Here,FIG. 3Ais a schematic sectional view illustrating the light emitting device.FIG. 3Bis an arrow view taken along line B-B inFIG. 3A.

As shown inFIGS. 3A and 3B, the light emitting device1aincludes a light emitting section20, a base section12(corresponding to an example of the first base section), a reflecting section14, and a wiring section15(corresponding to an example of the first wiring section).

The base section12is plate-like and translucent. The surface12bof the base section12can be provided with an uneven portion, not shown, or a diffusing layer (e.g., a layer made of resin containing fine particles), not shown, for diffusing the emitted light.

The end surface31a1of the first pillar section31aand the end surface31b1of the second pillar section31bare exposed from the surface12a(corresponding to an example of the first surface) of the base section12.

The base section12can be formed from e.g. a translucent material. The translucent material is e.g. an organic material such as translucent resin, or an inorganic material such as glass. For instance, the translucent resin can be made similar to that illustrated in the translucent section26.

The refractive index of the base section12and the refractive index of the translucent section26can be made comparable. If these refractive indices are made comparable, reflection at the interface between the base section12and the translucent section26can be suppressed. This can increase the light extraction efficiency.

In one surface12aof the base section12, a recess12a1is provided. The light emitting section20is provided inside the recess12a1. That is, the light emitting section20is embedded inside the base section12. This can suppress tilting of the light emitting section20with respect to the other surface12bof the base section12.

Furthermore, the light emitted from the side surface side of the light emitting section20can be transmitted inside the base section12. This can suppress narrowing of the directivity of the light emitting section20. As a result, the uniformity of the intensity of the light emitted from the light emitting device la can be improved. Furthermore, in the case where the light emitting device la is a surface emitting module used in e.g. an illumination device, illumination unevenness can be suppressed.

The reflecting section14is provided between the base section12and the wiring section15. The reflecting section14is provided so as to cover the surface12aof the base section12. The reflecting section14is reflective. The reflecting section14can be formed from e.g. a white resin such as white resist, or titanium oxide (TiO2). If the reflecting section14is patterned so as to avoid short circuit in the light emitting section20, the reflecting section14can be formed from a metal such as aluminum. The reflecting section14is provided with holes14afor exposing the end surface31a1and the end surface31b1.

The reflecting section14can be a reflecting section for reflecting light of a prescribed wavelength. For instance, the reflecting section14can be a reflecting section for reflecting e.g. red or blue light.

The wiring section15is provided on the reflecting section14. In this case, the wiring section15is electrically connected to the end surface31a1and the end surface31b1via the holes14a. That is, the wiring section15is connected to the light emitting element22. The material, configuration and the like of the wiring section15can be made similar to the material, configuration and the like of the wiring section5described above.

The light emitting device la according to this embodiment can improve the volume productivity like the light emitting device1described above.

Furthermore, the light emitting section20is embedded inside the base section12. This can suppress tilting of the light emitting section20with respect to the base section12in the volume production of the light emitting device1a.

Furthermore, the wiring section15having a prescribed configuration is provided. Thus, the heat dissipation performance can also be improved.

FIGS. 4A and 4Bare schematic views illustrating a light emitting device according to a third embodiment. Here,FIG. 4Ais a schematic sectional view illustrating the light emitting device.FIG. 4Bis an arrow view taken along line C-C inFIG. 4A.

As shown inFIGS. 4A and 4B, the light emitting device1bincludes a light emitting section20, a base section42(corresponding to an example of the second base section), a bonding section43(corresponding to an example of the second bonding section), a reflecting section44(corresponding to an example of the second reflecting section), and a wiring section45(corresponding to an example of the second wiring section).

The light emitting section20including a light emitting element22is provided on the surface42b(corresponding to an example of the second surface) side of the base section42.

The base section42is plate-like and translucent. The surface42aof the base section42can be provided with an uneven portion, not shown, or a diffusing layer (e.g., a layer made of resin containing fine particles), not shown, for diffusing the emitted light.

The base section42can be formed from e.g. a translucent material. The translucent material is e.g. an organic material such as translucent resin, or an inorganic material such as glass. For instance, the translucent resin can be made similar to that illustrated in the translucent section26.

The bonding section43is translucent. The bonding section43is provided so as to cover the surface42bof the base section42. The light emitting surface26bof the translucent section26is bonded to the base section42via the bonding section43. That is, the light emitting section20is bonded to the base section42via the bonding section43. The bonding section43is formed by e.g. curing a transparent adhesive.

The bonding section43only needs to be provided at least between the base section42and the light emitting section20.

The refractive index of the base section42, the refractive index of the bonding section43, and the refractive index of the translucent section26can be made comparable. If these refractive indices are made comparable, reflection at the interface between the base section42and the bonding section43and at the interface between the translucent section26and the bonding section43can be suppressed. This can increase the light extraction efficiency.

The reflecting section44is provided so as to cover the surface42bside of the base section42. The reflecting section44is reflective. If the reflecting section44is provided, the light emitted from the side surface side of the light emitting section20can be reflected. This can narrow the directivity of the light emitting section20. That is, mixing of light between the adjacent light emitting sections20can be suppressed. For instance, in the case where the light emitting device lb is used in e.g. a device for displaying characters and images, the reflecting section44thus provided can make the display clear.

The reflecting section44can be formed from e.g. a white resin such as white resist, a resin added with a reflective material such as metal, or a metal. In the case where the wiring section45is formed from a highly reflective material (e.g., aluminum), the reflecting section44can be omitted.

The reflecting section44is provided with holes44afor exposing the end surface31a1and the end surface31b1.

The wiring section45is provided on the reflecting section44. In this case, the wiring section45is electrically connected to the end surface31a1and the end surface31b1via the holes44a. That is, the wiring section45is connected to the light emitting element22. The material, configuration and the like of the wiring section45can be made similar to the material, configuration and the like of the wiring section5described above.

In the example illustrated inFIGS. 4A and 4B, a plurality of light emitting sections20are provided. The wiring section45is planar. The wiring section45is provided for each region between the light emitting sections20so as to cover the region between the light emitting sections20.

The light emitting device1baccording to this embodiment can improve the volume productivity like the light emitting device1described above.

Furthermore, the wiring section45having a prescribed configuration is provided. Thus, the heat dissipation performance can also be improved.

The light emitting section20illustrated above corresponds to the case of the light emitting section20based on WLP (wafer-level package).

However, the embodiments are not limited to the light emitting section20based on WLP. For instance, the embodiments are also applicable to a light emitting section in which the light emitting element22is flip-chip connected to a substrate including a wiring layer.

Next, a method for manufacturing a light emitting device is illustrated.

FIGS. 5A to 5Care schematic process sectional views illustrating the steps from forming a light emitting element22to forming a sealing section32in the method for manufacturing a light emitting device.

First, as shown inFIG. 5A, on the surface70aof a substrate70made of e.g. sapphire, a second semiconductor layer25, a light emitting layer24, and a first semiconductor layer23are formed. That is, a light emitting element22including a light emitting surface22ais formed. Then, an insulating section27is formed on the surface of the second semiconductor layer25and the first semiconductor layer23. A first seed section29ais formed on the surface of the first semiconductor layer23. A second seed section29bis formed on the surface of the second semiconductor layer25.

These components can be formed by using known techniques such as film formation, photolithography, and dry etching.

Next, as shown inFIG. 5B, a first sealing section32ais formed on the entire surface on the surface70aside. An opening32a1is formed so as to expose part of the first seed section29aand the second seed section29b.

Next, as shown inFIG. 5C, by using a known film formation technique, a film constituting a first wiring section30a, a second wiring section30b, a first pillar section31a, and a second pillar section31bis formed. By using the photolithography technique and dry etching technique, a first wiring section30a, a second wiring section30b, a first pillar section31a, and a second pillar section31bare successively formed. Then, by using a technique such as spin coating, a film constituting a second sealing section32bis formed on the entire surface on the surface70aside. The film is planarized so as to expose the end surface31a1of the first pillar section31aand the end surface31b1of the second pillar section31b. Thus, a second sealing section32bis formed.

Furthermore, by using a technique such as lift-off, the substrate70is removed.

FIGS. 6A and 6Bare schematic process sectional views illustrating the steps from forming an uneven portion22a1to forming a translucent section26in the method for manufacturing a light emitting device.

First, as shown inFIG. 6A, an uneven portion22a1is formed on the surface22aof the light emitting element22.

In the case where the second semiconductor layer25is formed from e.g. GaN, the uneven portion22a1can be formed by using the we etching technique. For instance, the surface22acan be we etched with an aqueous solution of tetramethylammonium hydroxide ((CH3)4NOH) (TMH) or an aqueous solution of potassium hydroxide (KOH) to form an uneven portion22a1based on the crystal structure.

Alternatively, an uneven portion22a1can be formed on the surface22aby using the photolithography technique and dry etching technique.

Next, as shown inFIG. 6B, a translucent section26is formed so as to cover the entire surface on the surface22aside of the light emitting element22.

The translucent section26can be formed by using a technique such as vacuum screen printing and molding.

For instance, by using a technique such as vacuum screen printing and molding, a translucent resin including a phosphor26ais applied to the surface22aside of the light emitting element22, and cured to form a translucent section26.

As described above, a plurality of light emitting sections20can be collectively formed.

FIG. 7is a schematic process sectional view illustrating the singulation of the light emitting section20.

As shown inFIG. 7, by cutting between the light emitting sections20, the light emitting sections20are singulated. Examples of the cutting method can include mechanical cutting using e.g. a diamond blade, cutting based on laser irradiation, and cutting with high-pressure water.

As described above, the light emitting section20including the light emitting element22can be formed.

FIGS. 8A to 8Care schematic process sectional views illustrating a method for manufacturing the light emitting device1illustrated inFIGS. 1A and 1B.

First, as shown inFIG. 8A, a bonding section3is formed on a first base body2. A light emitting section20is provided on the bonding section3. Then, a film74constituting a second base body4is formed so as to cover the bonding section3and the light emitting section20.

For instance, by using a technique such as vacuum screen printing and molding, a transparent adhesive is applied onto the first base body2and turned into a semi-cured state. Then, a light emitting section20is provided on the semi-cured transparent adhesive, which is then cured. In this case, the cured transparent adhesive constitutes a bonding section3. The transparent adhesive can be semi-cured and cured by e.g. heat treatment. The light emitting section20can be provided by using e.g. the die mounting technique.

The film74constituting a second base body4can be formed by e.g. applying a prescribed resin using a technique such as curtain coating, and curing the resin. The applied resin can be cured by e.g. heat treatment.

Next, as shown inFIG. 8B, the surface of the film74is planarized to expose the light emitting section20. That is, the planarization is performed until the end surface31a1and the end surface31b1are exposed. By such planarization, a second base body4is formed. The planarization can be performed by e.g. grinding.

As described above, a light emitting section20is embedded on the surface4aside of the base section10.

Next, as shown inFIG. 8C, a wiring section5connected to the light emitting element22is formed on the surface4aof the base section10.

Here, the wiring section5having the configuration described above is formed.

For instance, a seed metal layer, not shown, having a prescribed shape is formed on the surface4aby a technique such as evaporation. Then, by using the electrolytic plating technique, a wiring section5is formed on the seed metal layer. Furthermore, by using the electrolytic plating technique, an oxidation resistant film made of e.g. nickel/gold can also be formed on the surface of the wiring section5.

Furthermore, as necessary, a heat dissipation fin6and the like are provided on the wiring section5.

Thus, a light emitting device including a plurality of light emitting sections20can be manufactured. Furthermore, by cutting a light emitting device including a plurality of light emitting sections20, a light emitting device including a desired number of light emitting sections20can be obtained. Examples of the cutting method can include mechanical cutting using e.g. a diamond blade, cutting based on laser irradiation, and cutting with high-pressure water.

FIGS. 9A to 9Dare schematic process sectional views illustrating a method for manufacturing the light emitting device1aillustrated inFIGS. 3A and 3B. First, as shown inFIG. 9A, a recess12a1is formed on the surface12aside of the base section12. The recess12a1can be formed by e.g. a technique such as grinding and we etching.

Next, as shown inFIG. 9B, a light emitting section20is provided inside the recess12a1. The light emitting section20can be provided by using e.g. the die mounting technique. In the singulation illustrated inFIG. 7, a plurality of light emitting sections20may be provided on an expansion sheet. In this case, by stretching the expansion sheet, the spacing between the light emitting sections20can be matched with the spacing between the recesses12a1. If the spacing between the light emitting sections20can be matched with the spacing between the recesses12a1, a plurality of light emitting sections20can be provided at once.

Next, as shown inFIG. 9C, a reflecting section14is formed so as to cover the surface12aof the base section12and the light emitting section20. The reflecting section14can be formed by e.g. applying white resist using a technique such as curtain coating, and curing the resist. The white resist can be cured by e.g. ultraviolet irradiation.

Next, as shown inFIG. 9D, holes14aare formed in the reflecting section14. A wiring section15is formed on the reflecting section14. For instance, in the case where the reflecting section14is formed from white resist, holes14acan be formed by using the photolithography technique. The formation of the wiring section15can be made similar to the formation of the wiring section5described above.

Furthermore, as necessary, a heat dissipation fin6and the like are provided on the wiring section15.

Thus, a light emitting device including a plurality of light emitting sections20can be manufactured. Furthermore, by cutting a light emitting device including a plurality of light emitting sections20, a light emitting device including a desired number of light emitting sections20can be obtained. Examples of the cutting method can include mechanical cutting using e.g. a diamond blade, cutting based on laser irradiation, and cutting with high-pressure water.

FIGS. 10A to 10Eare schematic process sectional views illustrating a method for manufacturing the light emitting device1billustrated inFIGS. 4A and 4B.

First, as shown inFIG. 10A, a film75constituting a bonding section43is formed on one surface of a base section42.

For instance, by using a technique such as vacuum screen printing and molding, a transparent adhesive is applied onto the base section42and turned into a semi-cured state. Thus, the film75is formed.

Next, as shown inFIG. 10B, a light emitting section20is provided on the film75.

For instance, a light emitting section20is provided on the semi-cured film75, which is then cured. In this case, the cured film75constitutes a bonding section43. The transparent adhesive can be semi-cured and cured by e.g. heat treatment. The light emitting section20can be provided by using e.g. the die mounting technique.

Next, as shown inFIG. 10C, a reflecting section44is formed so as to cover the bonding section43and the light emitting section20.

For instance, the reflecting section44can be formed by e.g. applying white resist using a technique such as curtain coating, and curing the resist. The white resist can be cured by e.g. ultraviolet irradiation.

Next, as shown inFIG. 10D, holes44aare formed in the reflecting section44.

For instance, in the case where the reflecting section44is formed from white resist, holes44acan be formed by using the photolithography technique.

Next, as shown inFIG. 10E, a wiring section45is formed on the reflecting section44.

The formation of the wiring section45can be made similar to the formation of the wiring section5described above.

Furthermore, as necessary, a heat dissipation fin6and the like are provided on the wiring section45.

Thus, a light emitting device including a plurality of light emitting sections20can be manufactured. Furthermore, by cutting a light emitting device including a plurality of light emitting sections20, a light emitting device including a desired number of light emitting sections20can be obtained. Examples of the cutting method can include mechanical cutting using e.g. a diamond blade, cutting based on laser irradiation, and cutting with high-pressure water.

In the manufacturing method according to this embodiment, the end surface31a1and the end surface31b1can be directly connected to the wiring section5. Thus, solder having a small cross-sectional area is not interposed between the end surface31a1,31b1and the wiring section5. This can suppress the increase of heat resistance in this portion. Furthermore, there is no need to perform solder reflow. Thus, there are no such problems as tilting of the light emitting section20in solder reflow.

Furthermore, the light emission efficiency of the light emitting section20thus formed can be increased.

Moreover, the manufacturing method as described above can improve the volume productivity.

Furthermore, a light emitting section20as small as the size of the light emitting element22can be easily manufactured. Furthermore, there is no need to use mounting members such as a lead frame and ceramic substrate. Thus, wiring, sealing and the like can be performed on the wafer level. Furthermore, inspection can be performed on the wafer level. Thus, the productivity in the manufacturing process can be improved. As a result, cost reduction is facilitated.

The embodiments illustrated above can realize a light emitting device capable of improving the volume productivity and a method for manufacturing the same.