JP2016058689A - Semiconductor light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semiconductor light-emitting device excellent in heat dissipation.SOLUTION: A semiconductor light-emitting device includes a semiconductor layer having a first layer and a second layer and a luminous layer and a side face, an n-side electrode provided in contact with the first layer, a p-side electrode provided in contact with the second layer, an insulating member for supporting the semiconductor layer, provided in the chip outer region on the outside of the side face of the semiconductor layer, where at least the surface of a part in close proximity to the side face has reflectivity to the light emitted from the luminous layer, an n-side metal layer in contact with the first layer, and extending from a part in contact with the first layer integrally to the chip outer region, and a p-side metal layer in contact with the second layer, and extending from a part in contact with the second layer integrally to the chip outer region.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a semiconductor light emitting device.

  A semiconductor light emitting device having a chip size package structure in which a phosphor layer is provided on one surface side of a semiconductor layer including a light emitting layer and a wiring layer, an external terminal, and a resin layer are provided on the other surface (mounting surface) side has been proposed. Yes. In the chip size package, since the area of the external terminal is reduced and the thermal resistance of the solder is high, heat dissipation can be a problem.

JP 2013-201273 A JP 2013-201340 A

  Embodiments of the present invention provide a semiconductor light emitting device with excellent heat dissipation.

  According to the embodiment, a semiconductor light emitting device includes a first layer including an n-type semiconductor, a second layer including a p-type semiconductor, and a light emitting layer provided between the first layer and the second layer. , A semiconductor layer having a side surface, an n-side electrode provided in a region overlapping the semiconductor layer in contact with the first layer, and a region overlapping the semiconductor layer in contact with the second layer a p-side electrode and a surface of the chip outside the side surface of the semiconductor layer, the surface of at least a portion close to the side surface is reflective to the emitted light of the light emitting layer, and the semiconductor layer is An insulating member to be supported, an n-side metal layer that is in contact with the first layer and that is integrally extended from the portion that is in contact with the first layer to the region outside the chip, is in contact with the second layer, and is in contact with the second layer A p-side metal layer integrally extending from the contacting portion to the outer region of the chip; It is provided.

1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic plan view of a semiconductor light emitting device according to an embodiment. The schematic cross section of the semiconductor layer of embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic cross-sectional view showing a method for manufacturing the semiconductor light emitting device of the embodiment. FIG. 3 is a schematic plan view showing a method for manufacturing the semiconductor light emitting device of the embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a partially enlarged schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. The temperature profile figure of the semiconductor light-emitting device of embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment. 1 is a schematic cross-sectional view of a semiconductor light emitting device according to an embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element in each drawing.

FIG. 1 is a schematic cross-sectional view of the semiconductor light emitting device of the embodiment.
2 is a schematic plan view of the mounting surface side of the semiconductor light emitting device of the embodiment, and corresponds to a bottom view in FIG.

  The semiconductor light emitting device of the embodiment includes a chip size device (hereinafter also simply referred to as a chip) 3 formed at a wafer level, an insulating member 27 provided around the chip 3, and a metal layer provided on the mounting surface side. 71, 72.

  The chip 3 is provided between the electrodes 7 and 8, the first wiring layers (on-chip wiring layers) 16 and 17, the optical layers 30 and 33, and the first wiring layers 16 and 17 and the optical layers 30 and 33. Semiconductor layer 15 formed.

  FIG. 3 is an enlarged schematic cross-sectional view of the semiconductor layer 15.

  The semiconductor layer 15 includes, for example, gallium nitride. The semiconductor layer 15 includes a first layer 11 including an n-type semiconductor, a second layer 12 including a p-type semiconductor, and a light emitting layer 13 provided between the first layer 11 and the second layer 12.

  The first layer 11 includes, for example, a base buffer layer and an n-type GaN layer. The second layer 12 includes, for example, a p-type GaN layer. The light emitting layer 13 includes a material that emits blue, purple, blue purple, ultraviolet light, or the like. The emission peak wavelength of the light emitting layer 13 is, for example, 430 to 470 nm.

  The semiconductor layer 15 is epitaxially grown on the substrate 10 as shown in FIG. The substrate 10 is, for example, a silicon substrate, a sapphire substrate, a silicon carbide substrate, or the like. A first layer 11, a light emitting layer 13 and a second layer 12 are epitaxially grown on the substrate 10 in this order. Thereafter, the second layer 12 and the light emitting layer 13 are selectively removed by RIE (Reactive Ion Etching) using a mask (not shown).

  Therefore, the semiconductor layer 15 includes a region (light emitting region) 15d having a laminated film of the second layer 12 and the light emitting layer 13, and the second surface 11a of the first layer 11 not covered with the light emitting layer 13 and the second layer 12. And a region 15e having

FIG. 4B corresponds to a bottom view of the semiconductor layer 15 shown in FIGS. 3 and 4A.
As shown in FIG. 4B, for example, the region 15e is formed in an island shape surrounded by the light emitting region 15d, and the region 15e continuously surrounds the light emitting region 15d on the outer peripheral side of the light emitting region 15d. Is formed. The area of the light emitting region 15d is wider than the area of the region 15e.

  As shown in FIG. 3, a first surface 15 a that is not covered with the light emitting layer 13 and the second layer 12 is formed on the first layer 11 on the opposite side of the second surface 11 a. The semiconductor layer 15 has a side surface 15c that follows the first surface 15a.

  As shown in FIG. 5A and FIG. 5B corresponding to the bottom view of FIG. 5A, the n-side electrode 8 is provided on the second surface 11a of the first layer 11, and the second layer 12 is provided. A p-side electrode 7 is provided on the surface. The p-side electrode 7 and the n-side electrode 8 are formed within a region (chip region) that overlaps the semiconductor layer 15.

  In the plan view of FIG. 5B, the area of the p-side electrode 7 is larger than the area of the n-side electrode 8. The contact area between the p-side electrode 7 and the second layer 12 is wider than the contact area between the n-side electrode 7 and the first layer 11.

  As shown in FIG. 6A and FIG. 6B corresponding to the bottom view of FIG. 6A, an insulating film 14 is provided on the surface of the semiconductor layer 15 other than the first surface 15a. The insulating film 14 is an inorganic film, for example, a silicon oxide film.

  In the insulating film 14, a first opening 14 a that exposes the p-side electrode 7 and a second opening 14 b that exposes the n-side electrode 8 are formed. For example, two n-side second openings 14b are formed apart from each other. The surface of the p-side electrode 7 between the two second openings 14 b is covered with an insulating film 14.

  The side surface 15 c of the first layer 11, the side surface of the second layer 12, and the side surface of the light emitting layer 13 are covered with an insulating film 14.

  As shown in FIG. 7A corresponding to the bottom view of FIG. 7A and FIG. 7A, on the opposite side of the first surface 15a of the semiconductor layer 15, the first p-side wiring layer 16 and A first n-side wiring layer 17 is provided.

  The first p-side wiring layer 16 is formed within a region (chip region) overlapping the semiconductor layer 15. The first p-side wiring layer 16 is also provided in the first opening 14 a and is in contact with the p-side electrode 7. The first p-side wiring layer 16 is connected to the p-side electrode 7 through a contact portion 16a formed integrally in the first opening 14a. The first p-side wiring layer 16 is not in contact with the first layer 11.

  The first n-side wiring layer 17 is formed within a region (chip region) that overlaps the semiconductor layer 15. The first n-side wiring layer 17 is also provided in the second opening 14 b and is in contact with the n-side electrode 8. The first n-side wiring layer 17 is connected to the n-side electrode 8 through a contact portion 17a formed integrally in the second opening 14b.

  For example, the first n-side wiring layer 17 is formed in a line pattern extending in a direction connecting the two island-shaped n-side electrodes 8. The portion between the two n-side electrodes 8 of the first n-side wiring layer 17 and the p-side electrode 7, and the portion between the two n-side electrodes 8 of the first n-side wiring layer 17 and the second layer 12 An insulating film 14 is provided therebetween, and the first n-side wiring layer 17 is not in contact with the p-side electrode 7 and the second layer 12.

  As shown in FIG. 4B, the light emitting region 15 d including the light emitting layer 13 occupies most of the planar region of the semiconductor layer 15. 5B, the area of the p-side electrode 7 connected to the light emitting region 15d is larger than the area of the n-side electrode 8. Therefore, a wide light emitting surface can be obtained and the light output can be increased.

  The p-side electrode 7 is provided between the second layer 12 and the first p-side wiring layer 16. As shown in FIG. 20A, the p-side electrode 7 is a laminated film having a plurality of layers (for example, three layers). The p-side electrode 7 includes a first film 7a, a second film 7b, and a third film 7c provided in this order from the second layer 12 side.

  For example, the first film 7 a is a silver (Ag) film having a high reflectance with respect to light emitted from the light emitting layer 13 and the phosphor layer 30. For example, the second film 7b is a titanium (Ti) film, and the third film 7c is a platinum (Pt) film.

  The n-side electrode 8 is provided between the first layer 11 and the contact portion 17 a of the first n-side wiring layer 17. As shown in FIG. 20B, the n-side electrode 8 is a laminated film having a plurality of layers (for example, three layers). The n-side electrode 8 includes a first film 8a, a second film 8b, and a third film 8c provided in this order from the first layer 11 side.

  For example, the first film 8 a is an aluminum (Al) film having a high reflectance with respect to light emitted from the light emitting layer 13 and the phosphor layer 30. For example, the second film 8b is a titanium (Ti) film, and the third film 8c is a platinum (Pt) film.

  As shown in FIG. 8B corresponding to the bottom view of FIG. 8A and FIG. 8A, an insulating film 18 is provided on the surface of the first p-side wiring layer 16 and the first n-side wiring layer 17. It has been. The insulating film 18 is also provided between the first p-side wiring layer 16 and the first n-side wiring layer 17. The insulating film 18 is, for example, an inorganic film, such as a silicon oxide film.

  The insulating film 18 has a first opening 18a exposing a part of the first p-side wiring layer 16 (p-side pad 16b) and a second opening exposing a part of the first n-side wiring layer 17 (n-side pad 17b). An opening 18b is formed.

  The area of the p-side pad 16b is larger than the area of the n-side pad 17b. The area of the n-side pad 17 b is larger than the contact area between the first n-side wiring layer 17 and the n-side electrode 8.

  The substrate 10 on the first surface 15a is removed as will be described later. On the first surface 15a from which the substrate 10 has been removed, an optical layer that provides desired optical characteristics to the light emitted from the semiconductor light emitting device is provided. For example, as shown in FIG. 1, a phosphor layer 30 is provided on the first surface 15 a of the semiconductor layer 15, and a transparent layer (first transparent layer) 33 is further provided on the phosphor layer 30. It has been.

  The phosphor layer 30 includes a plurality of particulate phosphors 31. The phosphor 31 is excited by the emitted light of the light emitting layer 13 and emits light having a wavelength different from that of the emitted light. The plurality of phosphors 31 are dispersed in the binding material 32. The binding material 32 transmits the emitted light of the light emitting layer 13 and the emitted light of the phosphor 31. Here, “transmission” is not limited to 100% transmittance, but also includes a case where a part of light is absorbed. For the binding material 32, for example, a transparent resin such as a silicone resin can be used.

  The transparent layer 33 does not contain phosphor particles. The transparent layer 33 protects the phosphor layer 30 during surface grinding of the insulating member 27 described later.

  Alternatively, the transparent layer 33 functions as a light scattering layer. That is, the transparent layer 33 includes a plurality of particulate scattering materials (for example, silicon oxide and titanium compound) that scatter the radiated light of the light emitting layer 13 and a binder (for example, a transparent resin) that transmits the radiated light of the light emitting layer 13. Including.

  An insulating member 27 is provided in the chip outside region outside the side surface of the semiconductor layer 15. The insulating member 27 is thicker than the semiconductor layer 15 and supports the semiconductor layer 15. The insulating member 27 covers the side surface of the semiconductor layer 15 with the insulating film 14 interposed therebetween.

  The insulating member 27 is also provided outside the side surface of the optical layer (the phosphor layer 30 and the transparent layer 33) and covers the side surface of the optical layer.

  The insulating member 27 is provided around the chip 3 including the semiconductor layer 15, the electrodes 7 and 8, the first wiring layers (on-chip wiring layers) 16 and 17, and the optical layer, and supports the chip 3.

  The upper surface 27a of the insulating member 27 and the upper surface of the transparent layer 33 form a flat surface. An insulating film 26 is provided on the back surface of the insulating member 27.

  A second p-side wiring layer 21 is provided on the first p-side pad 16 b of the first p-side wiring layer 16. The second p-side wiring layer 21 is in contact with the first p-side pad 16b of the first p-side wiring layer 16 and extends to a region outside the chip. The portion of the second p-side wiring layer 21 that extends to the area outside the chip is supported by the insulating member 27 via the insulating film 26.

  Further, a part of the second p-side wiring layer 21 extends to a region overlapping the first n-side wiring layer 17 via the insulating film 18.

  A second n-side wiring layer 22 is provided on the first n-side pad 17 b of the first n-side wiring layer 17. The second n-side wiring layer 22 is in contact with the first n-side pad 17b of the first n-side wiring layer 17 and extends to a region outside the chip. The portion of the second n-side wiring layer 22 that extends to the area outside the chip is supported by the insulating member 27 via the insulating film 26.

  FIG. 13B shows an example of a planar layout of the second p-side wiring layer 21 and the second n-side wiring layer 22.

  The second p-side wiring layer 21 and the second n-side wiring layer 22 are disposed asymmetrically with respect to the center line c that bisects the planar region of the semiconductor layer 15, and the lower surface (on the mounting surface side) of the second p-side wiring layer 21. Surface) is wider than the lower surface of the second n-side wiring layer 22.

  As shown in FIG. 1, an insulating film 19 is provided on the surfaces of the second p-side wiring layer 21 and the second n-side wiring layer 22. The insulating film 19 is an inorganic film, for example, a silicon oxide film or the like.

  As shown in FIG. 10, the insulating film 19 includes a first opening 19 a for exposing the second p-side pad 21 a of the second p-side wiring layer 21 and a second n-side pad 22 a for exposing the second n-side wiring layer 22. Two openings 19b are formed.

  A p-side external connection electrode 23 is provided on the second p-side pad 21a of the second p-side wiring layer 21, as shown in FIG. The p-side external connection electrode 23 is provided on the second p-side wiring layer 21 in contact with the second p-side pad 21 a of the second p-side wiring layer 21.

  Further, a part of the p-side external connection electrode 23 is also in a region overlapping the first n-side wiring layer 17 via the insulating films 18 and 19 and a region overlapping the second n-side wiring layer 22 via the insulating film 19. Is provided.

  The p-side external connection electrode 23 extends to the chip region that overlaps the semiconductor layer 15 and the region outside the chip. The p-side external connection electrode 23 is thicker than the first p-side wiring layer 16 and thicker than the second p-side wiring layer 21.

  An n-side external connection electrode 24 is provided on the second n-side pad 22 a of the second n-side wiring layer 22. The n-side external connection electrode 24 is disposed outside the chip and is in contact with the second n-side pad 22 a of the second n-side wiring layer 22.

  The n-side external connection electrode 24 is thicker than the first n-side wiring layer 17 and thicker than the second n-side wiring layer 22.

  A resin layer (insulating layer) 25 is provided between the p-side external connection electrode 23 and the n-side external connection electrode 24. The resin layer 25 is in contact with the side surface of the p-side external connection electrode 23 and the side surface of the n-side external connection electrode 24 and is filled between the p-side external connection electrode 23 and the n-side external connection electrode 24.

  The resin layer 25 is provided around the p-side external connection electrode 23 and the n-side external connection electrode 24 and covers the side surface of the p-side external connection electrode 23 and the side surface of the n-side external connection electrode 24.

  The resin layer 25 increases the mechanical strength of the p-side external connection electrode 23 and the n-side external connection electrode 24. The resin layer 25 functions as a solder resist that prevents the solder from spreading during mounting.

  The lower surface of the p-side external connection electrode 23 is exposed from the resin layer 25 and functions as a p-side mounting surface (p-side external terminal) 23a that can be connected to an external circuit such as a mounting substrate. The lower surface of the n-side external connection electrode 24 is exposed from the resin layer 25 and functions as an n-side mounting surface (n-side external terminal) 24a that can be connected to an external circuit such as a mounting substrate. The p-side mounting surface 23a and the n-side mounting surface 24a are bonded to the land pattern of the mounting board via, for example, solder or a conductive bonding material.

  Here, it is preferable that the p-side mounting surface 23 a and the n-side mounting surface 24 a further protrude from the surface of the resin layer 25. Thereby, the connection part solder shape at the time of mounting is stabilized, and the reliability of mounting can be improved.

  FIG. 2 shows an example of a planar layout of the p-side mounting surface 23a and the n-side mounting surface 24a.

  The p-side mounting surface 23a and the n-side mounting surface 24a are disposed asymmetrically with respect to the center line c that bisects the planar region of the semiconductor layer 15, and the p-side mounting surface 23a is wider than the n-side mounting surface 24a.

  The interval between the p-side mounting surface 23a and the n-side mounting surface 24a is set to an interval at which solder does not bridge between the p-side mounting surface 23a and the n-side mounting surface 24a during mounting.

  The n-side electrode contact surface (second surface 11a of the first layer 11) in the semiconductor layer 15 is rearranged in a wider region including the region outside the chip by the first n-side wiring layer 17 and the second n-side wiring layer 22. ing. As a result, the area of the n-side electrode surface in the semiconductor layer 15 can be reduced while ensuring the area of the n-side mounting surface 24a sufficient for highly reliable mounting. Accordingly, the area of the region 15e not including the light emitting layer 13 in the semiconductor layer 15 can be reduced, and the area of the region 15d including the light emitting layer 13 can be increased to improve the light output.

  According to the semiconductor light emitting device of the embodiment, the p-side metal layer 71 and the n-side metal layer 72 are provided on the mounting surface side. The p-side metal layer 71 includes the first p-side wiring layer 16, the second p-side wiring layer 21, and the p-side external connection electrode 23. The n-side metal layer 72 includes the first n-side wiring layer 17, the second n-side wiring layer 22, and the n-side external connection electrode 24.

  The semiconductor layer 15 is formed on the substrate by an epitaxial growth method. The substrate is removed, and the semiconductor layer 15 does not include the substrate on the first surface 15a side. The height of the semiconductor light emitting device can be reduced by removing the substrate. Further, by removing the substrate, minute irregularities can be formed on the first surface 15a of the semiconductor layer 15, and the light extraction efficiency can be improved.

  The semiconductor layer 15 is supported on a support made of a composite of the metal layers 71 and 72 and the resin layer 25. The semiconductor layer 15 is supported from the side by an insulating member 27 that is thicker than the semiconductor layer 15, for example, a resin layer.

  As a material of the metal layers 71 and 72, for example, copper, gold, nickel, silver, or the like can be used. Among these, when copper is used, good thermal conductivity, high migration resistance, and adhesion to an insulating material can be improved.

  Due to the thermal cycle during mounting of the semiconductor light emitting device, stress due to solder or the like that joins the p-side mounting surface 23 a and the n-side mounting surface 24 a to the land of the mounting substrate is applied to the semiconductor layer 15. By forming the p-side external connection electrode 23, the n-side external connection electrode 24, and the resin layer 25 to appropriate thicknesses (heights), the p-side external connection electrode 23, the n-side external connection electrode 24, and the resin layer 25 are formed. The stress can be absorbed and relaxed. In particular, the stress relaxation effect can be enhanced by using a resin layer 25 that is more flexible than the semiconductor layer 15 as a part of the support on the mounting surface side.

  The metal layers 71 and 72 include, for example, copper having high thermal conductivity as a main component, and a high thermal conductor spreads over a wide area in a region overlapping the light emitting layer 13. The heat generated in the light emitting layer 13 is radiated to the mounting substrate through the metal layers 71 and 72 through a short path formed below the chip.

  In particular, the p-side mounting surface 23a of the p-side metal layer 71 connected to the light emitting region 15d of the semiconductor layer 15 overlaps most of the planar region of the semiconductor layer 15 in a plan view shown in FIG. It is possible to dissipate heat to the mounting substrate through the layer 71 with high efficiency.

  In addition, according to the embodiment, the p-side mounting surface 23a extends to the area outside the chip. Therefore, the planar size of the solder joined to the p-side mounting surface 23a can be increased, and the heat dissipation to the mounting substrate via the solder can be improved.

  Further, the second n-side wiring layer 22 extends to the area outside the chip. For this reason, the n-side mounting surface 24a can be arranged in a region outside the chip without being restricted by the p-side mounting surface 23a that occupies most of the region overlapping the chip. By arranging the n-side mounting surface 24a in the area outside the chip, the area can be made larger than when the n-side mounting surface 24a is laid out only within the chip area range.

  Therefore, also on the n-side, the planar size of the solder bonded to the n-side mounting surface 24a can be increased, and the heat dissipation to the mounting substrate via the solder can be improved.

  The light emitted from the light emitting layer 13 toward the first surface 15a is incident on the phosphor layer 30, and a part of the light excites the phosphor 31, and the light of the light emitting layer 13 and the light of the phosphor 31 are mixed. For example, white light is obtained as light.

  The light emitted from the light emitting layer 13 toward the mounting surface is reflected by the p-side electrode 7 and the n-side electrode 8 and travels toward the upper phosphor layer 30 side.

  A transparent layer (first transparent layer) 33 is provided on the phosphor layer 30, and a transparent layer (second transparent layer) 34 is provided on the transparent layer 33 and the insulating member 27 in the region outside the chip. Yes.

  The transparent layer 34 includes a plurality of particulate scattering materials (for example, silicon oxide) that scatter the emitted light of the light emitting layer 13 and a binder (for example, a transparent resin) that transmits the emitted light of the light emitting layer 13.

  The transparent layer 34 functions as a light scattering layer. The planar size of the transparent layer 34 that is the light scattering layer is larger than the planar size of the phosphor layer 30 and the planar size of the transparent layer 33. That is, the planar size of the transparent layer 34 is larger than the planar size of the chip 3. Therefore, the range of light emitted from the semiconductor light emitting device to the outside can be expanded, and wide-angle light distribution characteristics are possible.

  At least the surface of the insulating member 27 that is close to the side surface of the semiconductor layer 15 is reflective to the emitted light of the light emitting layer 13. In addition, the portion of the insulating member 27 that is close to the side surface of the phosphor layer 30 and the portion that is close to the side surface of the transparent layer 33 are reflective to the emitted light of the light emitting layer 13 and the emitted light of the phosphor 31. Further, the vicinity of the boundary between the insulating member 27 and the transparent layer 34 is reflective to the emitted light of the light emitting layer 13 and the emitted light of the phosphor 31.

  Further, as shown in FIG. 30B, the insulating member 27 may be provided with a reflective layer 55 on the surface of the portion close to the side surface of the optical layer (phosphor layer 30, transparent layer 33). The effect of can be obtained.

  For example, the insulating member 27 is a resin layer having a reflectance of 50% or more with respect to the emitted light of the light emitting layer 13 and the emitted light of the phosphor 31.

  Accordingly, the radiation emitted from the side surface of the chip 3 and the light scattered by the transparent layer 34 and directed toward the insulating member 27 can be reflected by the insulating member 27. Light absorption loss in the insulating member 27 can be prevented, and the light extraction efficiency to the outside through the transparent layer 34 can be increased. In addition, as shown in FIG. 30B, the same effect can be obtained by providing the reflective layer 55 on the surface of the insulating member 27 (side surface close to the optical layers 30 and 33).

  The phosphor layer 30 is formed on the first surface 15 a of the semiconductor layer 15 by a wafer level process, and the planar size of the phosphor layer 30 is substantially the same as the planar size of the semiconductor layer 15 or larger than the planar size of the semiconductor layer 15. Slightly bigger.

  The phosphor layer 30 is not formed around the side surface of the semiconductor layer 15 and the mounting surface side. That is, the phosphor layer 30 is not formed unnecessarily on the chip side surface and the mounting surface side where light is not extracted to the outside, and the cost can be reduced.

  In general flip chip mounting, a phosphor layer is formed so as to cover the entire chip after the LED chip is mounted on a mounting substrate via bumps or the like. Alternatively, the resin is underfilled between the bumps.

  On the other hand, according to the semiconductor light emitting device of the embodiment, the periphery of the p-side external connection electrode 23 and the periphery of the n-side external connection electrode 24 are different from the phosphor layer 30 in the state before mounting shown in FIG. The resin layer 25 is provided, and characteristics suitable for stress relaxation can be given to the mounting surface side. Further, since the resin layer 25 is already provided on the mounting surface side, underfill after mounting is not necessary.

  The first layer 15a side of the semiconductor layer 15 is provided with an optical layer designed to prioritize light extraction efficiency, color conversion efficiency, light distribution characteristics, etc., and on the mounting surface side, stress relaxation during mounting, A layer giving priority to the properties as an alternative support is provided. For example, the resin layer 25 has a structure in which a base resin is filled with a filler such as silica particles at a high density, and is adjusted to an appropriate hardness as a support.

  According to the embodiment described above, the semiconductor layer 15, the electrodes 7 and 8, the on-chip wiring layers 16 and 17, and the optical layer are collectively formed at the wafer level to realize the low-cost chip size device 3 and the external terminals. (Mounting surface) 23a and 34a can be expanded to the area | region outside a chip | tip, and heat dissipation can be made high. Therefore, an inexpensive and highly reliable semiconductor light emitting device can be provided.

  Next, with reference to FIGS. 4A to 13B, a method for manufacturing the semiconductor light emitting device of the embodiment will be described.

  4 (b), FIG. 5 (b), FIG. 6 (b), FIG. 7 (b), FIG. 8 (b), FIG. 13 (a) and FIG. 13 (b) are respectively shown in FIG. 5 (a), FIG. 6 (a), FIG. 7 (a), FIG. 8 (a), FIG. 9 and FIG.

  The semiconductor layer 15 is epitaxially grown on the substrate 10 by, for example, MOCVD (metal organic chemical vapor deposition). The substrate 10 is, for example, a silicon substrate. Alternatively, the substrate 10 may be a sapphire substrate or a silicon carbide substrate. The semiconductor layer 15 is a nitride semiconductor layer containing gallium nitride (GaN), for example.

  For example, the laminated film of the second layer 12 and the light emitting layer 13 is selectively etched by the RIE (Reactive Ion Etching) method, and the second surface of the first layer 11 as shown in FIGS. 11a is exposed.

  The first layer 11 is selectively removed and separated into a plurality of semiconductor layers 15 by the substrate 10. The grooves for separating the semiconductor layer 15 into a plurality are formed, for example, in a lattice pattern.

  Next, as shown in FIGS. 5A and 5B, the p-side electrode 7 is formed on the surface of the second layer 12, and the n-side electrode 8 is formed on the second surface 11 a of the first layer 11.

  Next, as shown in FIGS. 6A and 6B, after the insulating film 14 is formed so as to cover the semiconductor layer 15 and the electrodes 7 and 8, the first opening 14 a and the second opening 14 b are formed in the insulating film 14. Form.

  Next, as shown in FIGS. 7A and 7B, a first p-side wiring layer 16 and a first n-side wiring layer 17 are formed. The first p-side wiring layer 16 is formed in the first opening 14 a and is in contact with the p-side electrode 7.

  The first n-side wiring layer 17 is formed in the second opening 14 b and is in contact with the n-side electrode 8. The first n-side wiring layer 17 is in contact with the n-side electrode 8 at, for example, two places. The first n-side wiring layer 17 is formed in a line extending in the direction connecting the two n-side electrodes 8. The insulating film 14 is interposed between the line-shaped portion of the first n-side wiring layer 17 and the p-side electrode 7, and the first n-side wiring layer 17 is not in contact with the p-side electrode 7.

  The p-side electrode 7, the n-side electrode 8, the first p-side wiring layer 16, and the first n-side wiring layer 17 are formed within a region that overlaps the semiconductor layer 15.

  Next, as shown in FIGS. 8A and 8B, an insulating film 18 is formed on the surface of the first p-side wiring layer 16 and the surface of the first n-side wiring layer 17, and a first opening is formed in the insulating film 18. 18a and a second opening 18b are formed. The first p-side pad 16b of the first p-side wiring layer 16 is exposed in the first opening 18a, and the first n-side pad 17b of the first n-side wiring layer 17 is exposed in the second opening 18b.

  Next, the substrate 10 is removed. In the stacked body including the semiconductor layer 15 and the wiring layers 16 and 17, the substrate 10 is removed while being supported by a temporary support (not shown).

  For example, the substrate 10 which is a silicon substrate is removed by dry etching such as RIE. Alternatively, the silicon substrate 10 may be removed by wet etching. Alternatively, when the substrate 10 is a sapphire substrate, it can be removed by a laser lift-off method.

  The semiconductor layer 15 epitaxially grown on the substrate 10 may contain a large internal stress. Further, the p-side metal layer 71, the n-side metal layer 72, and the resin layer 25 are flexible materials compared to the semiconductor layer 15 made of, for example, a GaN-based material. Therefore, even if the internal stress during epitaxial growth is released at once when the substrate 10 is peeled off, the p-side metal layer 71, the n-side metal layer 72, and the resin layer 25 absorb the stress. For this reason, damage to the semiconductor layer 15 in the process of removing the substrate 10 can be avoided.

  The first surface 15a of the semiconductor layer 15 exposed by removing the substrate 10 is roughened as necessary.

  Furthermore, the phosphor layer 30 described above is formed on the first surface 15 a, and the transparent layer 33 is formed on the phosphor layer 30. The process so far is performed in a wafer state.

  Then, the wafer is diced into a plurality of chips 3. The chip 3 is supported by a temporary support (not shown). As shown in FIG. 9, an insulating member (support) is provided around the chip 3 (outer chip area) and on the chip 3 (on the transparent layer 33). Member) 27 is formed.

  As shown in FIG. 10, an insulating film 26 is formed on the lower surface of the insulating member 27 in FIG. As a result, the step between the chip 3 and the insulating member 27 is eliminated, and the reliability of the wiring layer formed thereafter can be improved. Although various resin materials can be used for the insulating film 26, imide resins, phenol resins, silicone resins, epoxy resins, and the like that are particularly excellent in heat resistance are suitable.

  A second p-side wiring layer 21 is formed on the first p-side pad 16b of the first p-side wiring layer 16 and on the insulating film 26 in the area outside the chip, as shown in FIG. A second n-side wiring layer 22 is formed on the first n-side pad 17b of the first n-side wiring layer 17 and on the insulating film 26 in the region outside the chip.

  The second n-side wiring layer 22 is aligned with the chip 3. Since the first n-side pad 17b is rearranged in a larger area than the n-side electrode 8, even if the formation position of the second n-side wiring layer 22 is slightly deviated from the chip 3, the second n-side wiring layer 22 is surely secured. The first n-side pad 17b can be overlaid and connected.

  An insulating film 19 is formed on the surface of the second p-side wiring layer 21 and the surface of the second n-side wiring layer 22, and a first opening 19 a and a second opening 19 b are formed in the insulating film 19.

  The second p-side pad 21a of the second p-side wiring layer 21 is exposed in the first opening 19a. The second n-side pad 22a of the second n-side wiring layer 22 is exposed in the second opening 19b.

  A p-side external connection electrode 23 is formed on the second p-side pad 21a as shown in FIG. An n-side external connection electrode 24 is formed on the second n-side pad 22a. Further, a resin layer 25 is formed between the p-side external connection electrode 23 and the n-side external connection electrode 24, around the p-side external connection electrode 23, and around the n-side external connection electrode 24.

  Next, the upper surface of the insulating member 27 on the transparent layer 33 and the upper surface of the insulating member 27 in the region outside the chip are ground. The insulating member 27 on the transparent layer 33 is removed, and the upper surface of the transparent layer 33 and the upper surface of the insulating member 27 in the region outside the chip are flattened as shown in FIG.

  The transparent layer 33 left on the phosphor layer 30 is not ground at the height at which the upper surface of the phosphor layer 30 is exposed, and protects the phosphor layer 30.

  As shown in FIG. 1, a transparent layer (scattering layer) 34 having a larger planar size than the chip 3 is formed on the flattened upper surface of the transparent layer 33 and the upper surface of the insulating member 27.

  Next, a semiconductor light emitting device according to another embodiment will be described with reference to FIGS. In the semiconductor light emitting device shown in FIGS. 14 to 17, the same elements as those in the semiconductor light emitting device shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the semiconductor light emitting device shown in FIG. 14, the inorganic film 41 is provided between the side surface of the phosphor layer 30 and the insulating member 27 and between the side surface of the transparent layer 33 and the insulating member 27. An inorganic film 42 is provided between the upper surface 27 a of the insulating member 27 and the transparent layer 34.

  The inorganic film 41 and the inorganic film 42 are, for example, silicon oxide films. The inorganic film 41 increases the adhesion between the phosphor layer 30 and the insulating member (for example, white resin) 27 and increases the adhesion between the transparent layer 33 and the insulating member 27. The inorganic film 42 enhances the adhesion between the insulating member 27 and the transparent layer 34. Further, as shown in FIG. 30A, roughening the side surfaces of the optical layer (phosphor layer 30, transparent layer 33) is also effective in improving the adhesion with the insulating member 27.

  According to the semiconductor light emitting device shown in FIG. 15, the transparent layer 33 is provided on the first surface 15 a of the semiconductor layer 15, and the phosphor layer 30 is provided on the transparent layer 33. Alternatively, as a transparent layer between the semiconductor layer 15 and the phosphor layer 30, for example, an inorganic film such as a silicon oxide film may be formed to improve the adhesion between the semiconductor layer 15 and the phosphor layer 30.

  By making the refractive index of the transparent layer 33 intermediate between the refractive index of the semiconductor layer 15 and the refractive index of the phosphor layer 30, the light extraction efficiency from the semiconductor layer 15 can be improved. Moreover, the distance between the semiconductor layer 15 and the phosphor layer 30 is increased by the transparent layer 33, and the rate at which heat generated by the phosphor layer 30 is transmitted to the semiconductor layer 15 can be reduced.

  According to the semiconductor light emitting device shown in FIG. 16, the transparent layer 33 is provided on the first surface 15a of the semiconductor layer 15, and the phosphor layer 30 is formed on the transparent layer 33 and on the insulating member 27 in the region outside the chip. Is provided.

  The transparent layer 33 is provided in a region surrounded by the insulating member 27, and the phosphor layer 30 has a larger planar size than the transparent layer 33. In this configuration, the light emitted from the semiconductor layer 15 spreads in the phosphor layer 30 via the transparent layer 33, so that the emission range can be expanded as compared with FIG. Thereby, effects such as improvement of light conversion efficiency and dispersion and reduction of heat generation due to light conversion in the phosphor layer 30 can be obtained.

  According to the semiconductor light emitting device shown in FIG. 17, the first transparent layer 33 is provided on the first surface 15a of the semiconductor layer 15, and the first transparent layer 33 and the insulating member 27 in the region outside the chip. A second transparent layer 34 is provided. The phosphor layer 30 is provided on the second transparent layer 34.

  The first transparent layer 33 is provided in a region surrounded by the insulating member 27, and the second transparent layer 34 and the phosphor layer 30 have a larger planar size than the first transparent layer 33. The provision of the second transparent layer 34 has an effect of further expanding the light emitted from the semiconductor layer 15 as compared with the example of FIG. 16, improving the light conversion efficiency by expanding the light emission range, and generating heat of the phosphor layer 30. The effect of dispersion and reduction can be further obtained.

  In the semiconductor light emitting device shown in FIG. 15, an inorganic film 41 is provided between the side surface of the phosphor layer 30 and the insulating member 27 and between the side surface of the transparent layer 33 and the insulating member 27, as shown in FIG. Also good.

  In the semiconductor light emitting device shown in FIG. 16, as shown in FIG. 22, an inorganic film 41 is provided between the side surface of the transparent layer 33 and the insulating member 27, and an inorganic film is provided between the upper surface of the insulating member 27 and the phosphor layer 30. A film 42 may be provided.

  In the semiconductor light emitting device shown in FIG. 17, as shown in FIG. 23, an inorganic film 41 is provided between the side surface of the transparent layer 33 and the insulating member 27, and an inorganic film is provided between the upper surface of the insulating member 27 and the transparent layer 34. 42 may be provided.

  Next, FIG. 18 is a schematic cross-sectional view of a semiconductor light emitting device of still another embodiment. The same reference numerals are given to the same elements as those in the embodiment shown in FIG. 1, and the detailed description thereof is omitted.

  The semiconductor light emitting device shown in FIG. 18 includes a chip 3, an insulating member 27 provided around the chip 3, and metal layers 61 and 62 provided on the mounting surface side.

  The configuration of the above embodiment can be applied to optical layers such as a phosphor layer, a transparent layer, and a scattering layer.

  The semiconductor layer 15 has the same configuration as that of the above embodiment, the p-side electrode 7 is provided on the surface of the second layer 12 of the semiconductor layer 15, and the n-side electrode 8 is provided on the second surface 11 a of the first layer 11. It has been. The p-side electrode 7 and the n-side electrode 8 are provided within a region (chip region) that overlaps the semiconductor layer 15.

  An insulating film 26 is formed on the opposite side of the first surface 15 a of the semiconductor layer 15, and an opening for exposing the p-side electrode 7 and an opening for exposing the n-side electrode 8 are formed in the insulating film 26.

  A p-side metal layer 61 and an n-side metal layer 62 are provided on the opposite side of the first surface 15 a of the semiconductor layer 15.

  The p-side metal layer 61 is a region (chip region) that overlaps the semiconductor layer 15 and is in contact with the p-side electrode 7 through an opening formed in the insulating film 26, and from the contact portion that is in contact with the p-side electrode 7. Extends into the area. The p-side metal layer 61 is electrically connected to the second layer 12 through the p-side electrode 7 and is not in contact with the first layer 11.

  The n-side metal layer 62 is a region (chip region) that overlaps the semiconductor layer 15 and is in contact with the n-side electrode 8 through an opening formed in the insulating film 26, and from the contact portion that is in contact with the n-side electrode 8. Extends into the area. The n-side metal layer 62 is electrically connected to the first layer 11 through the n-side electrode 8. An insulating film 62 is provided between the n-side metal layer 62 and the p-side electrode 7 and between the n-side metal layer 62 and the second layer 12, and the n-side metal layer 62 includes the p-side electrode 7 and the second electrode 12. It is not in contact with the second layer 12.

  The area of the contact surface between the p-side electrode 7 and the p-side metal layer 61 is larger than the area of the contact surface between the n-side electrode 8 and the n-side metal layer 62. The area of the p-side metal layer 61 is larger than the area of the n-side metal layer 62.

  An insulating member 27 is provided in the chip outside region outside the side surface of the semiconductor layer 15. The insulating member 27 is thicker than the semiconductor layer 15.

  The portion of the p-side metal layer 61 that extends to the area outside the chip is supported by the insulating member 27 via the insulating film 26. The portion of the n-side metal layer 62 that extends to the area outside the chip is supported by the insulating member 27 via the insulating film 26.

  A p-side external connection electrode 23 is provided on the p-side metal layer 61. The p-side external connection electrode 23 is in contact with the p-side metal layer 61 and is electrically connected to the p-side metal layer 61. The p-side external connection electrode 23 is thicker than the p-side metal layer 61.

  An insulating film 45 is provided on the surface of the n-side metal layer 62. The insulating film 45 is, for example, an inorganic film, such as a silicon oxide film.

  In the insulating film 45, an opening exposing the n-side pad 62b of the n-side metal layer 62 is formed. The n-side external connection electrode 24 is provided on the n-side pad 62b. The n-side external connection electrode 24 is disposed in a region outside the chip, is in contact with the n-side pad 62 b of the n-side metal layer 62, and is electrically connected to the n-side metal layer 62. The n-side external connection electrode 24 is thicker than the n-side metal layer 62.

  A resin layer 25 is provided between the p-side external connection electrode 23 and the n-side external connection electrode 24. The resin layer 25 is in contact with the side surface of the p-side external connection electrode 23 and the side surface of the n-side external connection electrode 24 and is filled between the p-side external connection electrode 23 and the n-side external connection electrode 24.

  The resin layer 25 is provided around the p-side external connection electrode 23 and the n-side external connection electrode 24 and covers the side surface of the p-side external connection electrode 23 and the side surface of the n-side external connection electrode 24.

  The lower surface of the p-side external connection electrode 23 is exposed from the resin layer 25 and functions as a p-side mounting surface (p-side external terminal) 23a that can be connected to an external circuit such as a mounting substrate. The lower surface of the n-side external connection electrode 24 is exposed from the resin layer 25 and functions as an n-side mounting surface (n-side external terminal) 24a that can be connected to an external circuit such as a mounting substrate. The p-side mounting surface 23a and the n-side mounting surface 24a are bonded to the land pattern of the mounting board via, for example, solder or a conductive bonding material.

  The p-side mounting surface 23a and the n-side mounting surface 24a are disposed asymmetrically with respect to the center line that bisects the planar region of the semiconductor layer 15, and the p-side mounting surface 23a is wider than the n-side mounting surface 24a.

  The contact area between the n-side pad 62 b of the n-side metal layer 62 and the n-side external connection electrode 24 is larger than the contact area between the n-side electrode 8 and the n-side metal layer 62. The n-side electrode contact surface (second surface 11 a of the first layer 11) in the semiconductor layer 15 is rearranged in a wider area by the n-side metal layer 62. As a result, the area of the n-side electrode surface in the semiconductor layer 15 can be reduced while ensuring the area of the n-side mounting surface 24a sufficient for highly reliable mounting. Accordingly, the area of the semiconductor layer 15 that does not include the light-emitting layer 13 can be reduced, and the area of the region that includes the light-emitting layer 13 can be increased to improve the light output.

  The semiconductor layer 15 is supported on a support made of a composite of the metal layers 61 and 62, the external connection electrodes 23 and 24, and the resin layer 25. The semiconductor layer 15 is supported from the side by an insulating member 27 that is thicker than the semiconductor layer 15, for example, a resin layer.

  As materials for the metal layers 61 and 62 and the external connection electrodes 23 and 24, for example, copper, gold, nickel, silver, or the like can be used. Among these, when copper is used, good thermal conductivity, high migration resistance, and adhesion to an insulating material can be improved.

  By forming the p-side external connection electrode 23, the n-side external connection electrode 24, and the resin layer 25 to appropriate thicknesses (heights), the p-side external connection electrode 23, the n-side external connection electrode 24, and the resin layer 25 are formed. The stress applied during mounting can be absorbed and relaxed. In particular, the stress relaxation effect can be enhanced by using a resin layer 25 that is more flexible than the semiconductor layer 15 as a part of the support on the mounting surface side.

  The metal layers 61 and 62 and the external connection electrodes 23 and 24 contain, for example, copper having high thermal conductivity as a main component, and a high thermal conductor spreads over a wide area in a region overlapping the light emitting layer 13. The heat generated in the light emitting layer 13 is radiated to the mounting substrate through the metal layers 61 and 62 and the external connection electrodes 23 and 24 through a short path formed below the chip.

  In particular, since the p-side mounting surface 23 a connected to the light emitting region of the semiconductor layer 15 overlaps most of the planar region of the semiconductor layer 15, it is formed on the mounting substrate through the p-side metal layer 61 and the p-side external connection electrode 23. Heat can be dissipated with high efficiency.

  In addition, according to the embodiment, the p-side mounting surface 23a extends to the area outside the chip. Therefore, the planar size of the solder joined to the p-side mounting surface 23a can be increased, and the heat dissipation to the mounting substrate via the solder can be improved.

  Further, the n-side metal layer 62 extends to the area outside the chip. For this reason, the n-side mounting surface 24a can be arranged in a region outside the chip without being restricted by the p-side mounting surface 23a that occupies most of the region overlapping the chip. By arranging the n-side mounting surface 24a in the area outside the chip, the area can be made larger than when the n-side mounting surface 24a is laid out only within the chip area range.

  Therefore, also on the n-side, the planar size of the solder bonded to the n-side mounting surface 24a can be increased, and the heat dissipation to the mounting substrate via the solder can be improved.

  The p-side metal layer 61 is pulled out from the portion in contact with the p-side electrode 7 (on-chip portion) immediately to the side and extends to a region outside the chip. The n-side metal layer 62 is pulled out laterally from a portion (on-chip portion) in contact with the n-side electrode 8 and extends to the outside chip region. Therefore, the heat of the semiconductor layer 15 can be efficiently released to the mounting substrate via the wide mounting surface.

  In addition, the phosphor layer 30 is formed by a wafer level process, and is not formed around the side surface of the semiconductor layer 15 and the mounting surface side. For this reason, the phosphor layer 30 is not formed wastefully on the chip side surface and the mounting surface side from which light is not extracted, and the cost can be reduced.

  In addition, a resin layer 25 different from the phosphor layer 30 is provided around the p-side external connection electrode 23 and the n-side external connection electrode 24 in the state before mounting shown in FIG. Properties suitable for relaxation can be provided. Further, since the resin layer 25 is already provided on the mounting surface side, underfill after mounting is not necessary.

  The first layer 15a side of the semiconductor layer 15 is provided with an optical layer designed to prioritize light extraction efficiency, color conversion efficiency, light distribution characteristics, etc., and on the mounting surface side, stress relaxation during mounting, A layer giving priority to the properties as an alternative support is provided. For example, the resin layer 25 has a structure in which a base resin is filled with a filler such as silica particles at a high density, and is adjusted to an appropriate hardness as a support.

  According to the embodiment described above, the semiconductor layer 15 and the optical layer are collectively formed at the wafer level to realize the low-cost chip size device 3, and the metal layers 61 and 62 and the external terminals (mounting surfaces) 23a and 34a are provided. The heat dissipation can be enhanced by extending the area outside the chip. Therefore, an inexpensive and highly reliable semiconductor light emitting device can be provided.

  Further, according to the semiconductor light emitting device shown in FIG. 19, in the device of FIG. 18, the inorganic film 46 between the side surface of the semiconductor layer 15 and the insulating member 27 and between the side surface of the phosphor layer 30 and the insulating member 27. Is provided.

  The inorganic film 46 is, for example, a silicon oxide film, and improves the adhesion between the semiconductor layer 15 and the insulating member 27 and the adhesion between the phosphor layer 30 and the insulating member 27.

  In a structure in which a phosphor layer is provided on a semiconductor layer including a light emitting layer and a transparent layer is provided on the phosphor layer, heat due to light emission of the light emitting layer and the phosphor layer is transmitted to the transparent layer. For example, it is difficult to improve the heat resistance of a transparent layer using a resin material, and heat is easily accumulated in the transparent layer. In some cases, the transparent layer may be deteriorated by heat, and the light emission characteristics of the semiconductor light emitting device may be deteriorated. In particular, in a high light output semiconductor light emitting device, deterioration of the transparent layer due to heat can be a problem.

  Therefore, according to the embodiment shown in FIG. 24, the heat insulating layer 51 is provided between the phosphor layer 30 and the transparent layer 33. The heat insulating layer 51 is transmissive to the light emitted from the light emitting layer 13 and the light emitted from the phosphor 31.

For example, a silicon oxide film (SiO ₂ film) having a small heat transfer coefficient and high light transmittance is formed as the heat insulating layer 51 by sputtering.

FIG. 25A is an example of a temperature profile of each layer having a structure in which the heat insulating layer 51 is not provided.
FIG. 25B is a temperature profile example of each layer having a structure in which a heat insulating layer 51 is provided between the phosphor layer 30 and the transparent layer 33.

  From the comparison between FIG. 25A and FIG. 25B, the heat from the semiconductor layer 15 and the phosphor layer 30 is hardly transmitted to the transparent layer 33 by providing the heat insulating layer 51. As a result, the temperature rise of the transparent layer 33 is suppressed, and the thermal deterioration of the transparent layer 33 can be prevented. The structure provided with the heat insulating layer 51 is particularly suitable for a high-power semiconductor light emitting device.

  The formation method of the heat insulation layer 51 is not limited to the sputtering method, and for example, a vapor deposition method, a plating method, a coating method, a sol-gel method, or the like can be used.

Further, the material of the heat insulating layer 51 is not limited to SiO ₂ , and various oxynitrides having high light transmittance and low heat transfer coefficient (for example, heat transfer coefficient of 30 W / (m ² K) or less), heat resistance Resin or the like can be used. For example, SrTiO ₃ , MgO, ZrO ₂ , YSZ (yttria stabilized zirconia) can be used as the material of the heat insulating layer 51. The heat insulating layer 51 may have a porous structure.

  In the structure shown in FIG. 14, as shown in FIG. 26, a heat insulating layer 51 may be provided between the phosphor layer 30 and the transparent layer 33.

  The distance that the light (excitation light) of the light emitting layer 13 travels in the phosphor layer 30 in the oblique direction is longer than the distance that the excitation light travels in the thickness direction in the phosphor layer 30, and the excitation light that travels in the oblique direction in the phosphor layer 30 Excites more phosphors 31.

  Therefore, among the light emitted from the phosphor layer 30, the light having a larger emission angle has a light emission color (for example, yellowish) of the phosphor 31. When the light extraction surface (the upper surface in FIG. 1) of the semiconductor light-emitting device is viewed from an oblique direction, light with a strong yellowishness, for example, is easier to see than when viewed from directly above. That is, there may be a color breakup in which the color of the visible light varies depending on the angle at which the semiconductor light emitting device is viewed.

  In the embodiment shown in FIGS. 1, 14, 24, and 26 described above, the phosphor layer 30 is provided in a region surrounded by the insulating member 27, and the upper end of the side surface of the insulating member 27 adjacent to the phosphor layer 30 is provided. Protrudes from the upper surface of the phosphor layer 30. A step is formed between the upper surface 27 a of the insulating member 27 and the upper surface of the phosphor layer 30. The periphery of the phosphor layer 30 is surrounded by an insulating member 27, and a region surrounded by the insulating member 27 is also formed above the phosphor layer 30.

  Further, as described above, the portion of the insulating member 27 that is close to the side surface of the phosphor layer 30 and the portion that is close to the side surface of the transparent layer 33 are reflected with respect to the emitted light of the light emitting layer 13 and the emitted light of the phosphor 31. Have sex.

  Therefore, according to the embodiment, as schematically represented by an arrow in FIG. 1, a part of the light emitted from the phosphor layer 30 in the oblique direction is directed to the side surface of the insulating member 27, and the side surface of the insulating member 27. Reflect on.

  Therefore, it is possible to reflect or scatter strong yellowish light with a large emission angle from the phosphor layer 30 in a direction with a small emission angle, and to suppress color breakup.

  The side surface of the insulating member 27 surrounding the periphery of the side surface of the optical layer (the phosphor layer 30 and the transparent layer 33) is perpendicular to the light emitting surface (the first surface 15a of the semiconductor layer 15 or the upper surface of the phosphor layer 30). Not limited to this, it may be inclined as shown in FIG.

  In the example shown in FIG. 27, the width of the region surrounded by the side surface of the insulating member 27 continuously increases from the lower part to the upper part on the semiconductor layer 15 side. The upper surface and the side surface of the insulating member 27 form an obtuse angle. The width of the region surrounded by the side surface of the insulating member 27 may gradually increase from the lower part to the upper part on the semiconductor layer 15 side.

  By tilting the side surface of the insulating member 27 surrounding the periphery of the optical layer, it is possible to increase the light distribution angle compared to the vertical side surface.

  As shown in FIG. 28, a space 53 surrounded by the side surface of the insulating member 27 may be provided on the phosphor layer 30 without providing a transparent layer on the phosphor layer 30. Even in this structure, the oblique light emitted from the phosphor layer 30 can be reflected by the side surface of the insulating member 27.

  As shown in FIG. 29, a reflective layer 52 different from the insulating member 27 may be provided on the upper surface of the insulating member 27.

  The reflective layer 52 is, for example, an aluminum (Al) layer or a scattering layer containing a light scattering material. The oblique light emitted from the phosphor layer 30 can also be reflected by the reflection layer 52.

  As shown in FIGS. 1, 14, 15, 18, 19, 21, 24, 26, and 29, the structure in which the phosphor layer 30 is provided only in the region surrounded by the insulating member 27 is the use of the phosphor layer 30. The amount can be reduced and the cost can be reduced.

  As shown in FIGS. 1, 14, 18, 19, 24, 26, 27, 28, and 29, the structure in which the transparent layer is not interposed between the semiconductor layer 15 and the phosphor layer 30 allows the heat of the phosphor layer 30 to flow. It is easy to dissipate heat to the mounting substrate through the semiconductor layer 15 and the metal below it. Therefore, the temperature rise of the phosphor layer 30 can be suppressed.

  In the structure shown in FIGS. 18 and 19, only one optical layer (phosphor layer 30) is stacked on the semiconductor layer 15, and the cost is low.

  As shown in FIGS. 1, 14, 24, 26, 27, and 29, in the structure in which the transparent layer is provided on the phosphor layer 30, the refractive index of the transparent layer is expressed as the refractive index of the transparent layer 32 of the phosphor layer 30. The light extraction efficiency can be improved by making the air refractive index intermediate.

  As shown in FIGS. 15, 16, 17, 21, 22, and 23, in the structure in which the transparent layer 33 is provided between the semiconductor layer 15 and the phosphor layer 30, the refractive index of the transparent layer is changed to the semiconductor layer (for example, GaN ) The optical extraction efficiency from the semiconductor layer 15 can be improved by setting the refractive index of 15 to be intermediate between the refractive index of the transparent layer 32 of the phosphor layer 30. Further, the return light from the phosphor layer 30 to the semiconductor layer 15 can be reduced.

  As shown in FIGS. 16, 17, 22, and 23, the structure in which the phosphor layer 30 is also provided on the upper surface 27 a of the insulating member 27 around the chip 3 can widen the excitation light emission area. For this reason, light conversion efficiency can be improved and the heat of the phosphor layer 30 can be dispersed.

  As shown in FIGS. 17 and 23, in the structure in which the transparent layer 34 is provided on the upper surface 27a of the insulating member 27 around the chip 3, and the phosphor layer 30 is provided on the transparent layer 34, the entire surface of the package is spread. Light spreads laterally in the transparent layer 34. Further, the reflected light from the phosphor layer 30 is re-reflected by the insulating member 27 and spreads in the transparent layer 34 in the lateral direction. For this reason, the light conversion efficiency is further increased. Further, if the transparent layer 34 is made scattering, the light conversion efficiency is further increased.

  In each embodiment described above, for example, a sapphire substrate used for epitaxial growth of the semiconductor layer 15 may be left on the first surface 15a as a transparent layer. The transparent layer is not limited to a resin material, and a crystal or glass may be used. The transparent layer is not limited to the light scattering function, and may have a function as a condensing lens or a diffusion lens.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  7 ... p-side electrode, 8 ... n-side electrode, 11 ... first layer, 12 ... second layer, 13 ... light emitting layer, 15 ... semiconductor layer, 16 ... first p-side wiring layer, 17 ... first n-side wiring layer, 21 ... 2nd p-side wiring layer, 22 ... 2nd n-side wiring layer, 23 ... p-side external connection electrode, 24 ... n-side external connection electrode, 25 ... resin layer, 27 ... insulating member, 30 ... phosphor layer, 33, 34 ... transparent layer, 41, 42, 46 ... inorganic film, 61 ... p-side metal layer, 62 ... n-side metal layer

Claims (24)

a semiconductor layer having a first layer including an n-type semiconductor, a second layer including a p-type semiconductor, a light emitting layer provided between the first layer and the second layer, and a side surface;
An n-side electrode provided in a region in contact with the first layer and overlapping the semiconductor layer;
A p-side electrode provided in a region in contact with the second layer and overlapping the semiconductor layer;
An insulating member that is provided in an outer region of the chip outside the side surface of the semiconductor layer, and at least a surface of a portion close to the side surface is reflective to the emitted light of the light emitting layer, and supports the semiconductor layer; ,
An n-side metal layer that is in contact with the n-side electrode and extends integrally from the portion in contact with the n-side electrode to the outer region of the chip;
A p-side metal layer that is in contact with the p-side electrode and extends integrally from the portion in contact with the p-side electrode to the outer region of the chip;
A semiconductor light emitting device comprising: An n-side external connection electrode provided in contact with the n-side metal layer;
A p-side external connection electrode provided in contact with the p-side metal layer;
The semiconductor light emitting device according to claim 1, further comprising:   The semiconductor light emitting device according to claim 2, wherein the n-side external connection electrode is thicker than the n-side metal layer, and the p-side external connection electrode is thicker than the p-side metal layer.   4. The semiconductor light emitting device according to claim 2, further comprising a resin layer provided between the n-side external connection electrode and the p-side external connection electrode.   5. The insulating film according to claim 1, further comprising an insulating film provided between the p-side electrode and the n-side metal layer and between the insulating member and the n-side metal layer. Semiconductor light emitting device. a semiconductor layer having a first layer including an n-type semiconductor, a second layer including a p-type semiconductor, a light emitting layer provided between the first layer and the second layer, and a side surface;
An n-side electrode provided in a region in contact with the first layer and overlapping the semiconductor layer;
A p-side electrode provided in a region in contact with the second layer and overlapping the semiconductor layer;
An insulating member that is provided in an outer region of the chip outside the side surface of the semiconductor layer, and at least a surface of a portion close to the side surface is reflective to the emitted light of the light emitting layer, and supports the semiconductor layer; ,
A first n-side wiring layer provided in a region overlapping the semiconductor layer in contact with the n-side electrode and having an n-side pad wider than the surface in contact with the n-side electrode on the opposite side of the surface in contact with the n-side electrode; ,
A second n-side wiring layer connected to the n-side pad and extending to the outside of the chip;
A first p-side wiring layer provided in a region overlapping the semiconductor layer in contact with the p-side electrode and having a p-side pad on the opposite side of the surface in contact with the p-side electrode;
A second p-side wiring layer connected to the p-side pad and extending to the outer region of the chip;
A semiconductor light emitting device comprising: An n-side external connection electrode provided in contact with the second n-side wiring layer;
A p-side external connection electrode provided in contact with the second p-side wiring layer;
The semiconductor light emitting device according to claim 6, further comprising:   8. The semiconductor light emitting device according to claim 7, wherein the n-side external connection electrode is thicker than the second n-side wiring layer, and the p-side external connection electrode is thicker than the second p-side wiring layer.   The semiconductor light emitting device according to claim 7, further comprising a resin layer provided between the n-side external connection electrode and the p-side external connection electrode.   The semiconductor light-emitting device according to claim 1, wherein the insulating member is thicker than the semiconductor layer.   The semiconductor light-emitting device according to claim 1, wherein the insulating member includes a resin having reflectivity with respect to the emitted light of the light-emitting layer.   The semiconductor light emitting device according to claim 1, wherein the insulating member includes a layer having reflectivity with respect to the emitted light of the light emitting layer.   The semiconductor light-emitting device according to claim 11, further comprising a first inorganic film provided between the side surface of the semiconductor layer and the insulating member.   The semiconductor light-emitting device according to claim 1, further comprising an optical layer provided on the first layer. The optical layer is
A binder that transmits the emitted light of the light emitting layer and the emitted light of the phosphor;
A plurality of phosphors dispersed in the binder and excited by the light emitted from the light emitting layer to emit light having a wavelength different from that of the light emitted from the light emitting layer;
The semiconductor light-emitting device according to claim 14, further comprising a phosphor layer containing   The semiconductor light emitting device according to claim 15, wherein the phosphor layer is provided in a region surrounded by the insulating member.   17. The semiconductor light emitting device according to claim 15, wherein the optical layer further includes a transparent layer that is laminated on the phosphor layer and is transparent to the emitted light of the light emitting layer. The transparent layer is
A first transparent layer provided on the phosphor layer in a region surrounded by the insulating member;
A second transparent layer provided on the first transparent layer and on the insulating member, and having a larger planar size than the phosphor layer and the first transparent layer;
The semiconductor light-emitting device according to claim 17.   The semiconductor light emitting device according to claim 14, further comprising a second inorganic film provided between the insulating member and a side surface of the optical layer.   The semiconductor light-emitting device according to claim 14, wherein a side surface of the optical layer is roughened.   The semiconductor light-emitting device according to claim 18, further comprising a third inorganic film provided between the insulating member and the second transparent layer.   The semiconductor light-emitting device according to claim 2, wherein the p-side external connection electrode has a larger area than the n-side external connection electrode and extends in a region overlapping the light-emitting layer. The phosphor layer is provided between the semiconductor layer and the transparent layer,
The semiconductor light-emitting device according to claim 17, wherein a heat insulating layer is provided between the phosphor layer and the transparent layer.   The semiconductor light-emitting device according to claim 16, wherein an upper end of a side surface of the insulating member adjacent to the phosphor layer protrudes from an upper surface of the phosphor layer.

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