SEMICONDUCTOR LIGHT-EMITTING DEVICE

Abstract

A light-emitting device is provided, which includes a substrate having a plane surface, a semiconductor light-emitting element mounted on the plane surface of the substrate and which emits light in a range from ultraviolet ray to visible light, a first light transmissible layer formed above the substrate and covering the semiconductor light-emitting element, a phosphor layer formed above the first light transmissible layer and containing phosphor particles and matrix, and a second light transmissible layer formed above the phosphor layer and contacting with the plane surface of the substrate. The surface of the phosphor layer has projections reflecting shapes of the phosphor particles.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is a cross-sectional view illustrating a semiconductor light-emitting device according to one embodiment.

FIG. 2 is a plan view of the semiconductor light-emitting device shown in FIG. 1.

FIG. 3 is a cross-sectional view illustrating relevant part of a semiconductor light-emitting chip in the semiconductor light-emitting device according to one embodiment.

FIG. 4 is a cross-sectional view illustrating relevant part of the semiconductor light-emitting chip in the semiconductor light-emitting device according to other embodiment.

FIG. 5 is a cross-sectional vies illustrating variation of a multilayered structure in the semiconductor light-emitting device according to one embodiment.

FIG. 6 is a cross-sectional view illustrating the semiconductor device according to one embodiment.

FIGS. 7A and 7B is a diagram drawing showing a state of a phosphor layer.

FIG. 8 is a cross-sectional view illustrating a conventional semiconductor light-emitting device.

FIGS. 9A and 9B is a diagram drawing showing a state of a phosphor layer.

FIGS. 10A to 10C are cross-sectional views illustrating a semiconductor light-emitting device according to other embodiment.

FIG. 11 is a diagram drawing explaining the shape of a multilayered structure.

FIG. 12 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 13 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 14 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIGS. 15A and 15B are cross-sectional views illustrating a semiconductor light-emitting device according to another embodiment.

FIGS. 16A and 16B are cross-sectional views illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 17 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIGS. 18A and 18B are cross-sectional views illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 19 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 20 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 21 is a plan view of the semiconductor light-emitting device shown in FIG. 20.

FIG. 22 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

FIG. 23 is a cross-sectional view illustrating a semiconductor light-emitting device according to another embodiment.

Claims

1. A light-emitting device comprising: a substrate having a plane surface;a semiconductor light-emitting element mounted on the plane surface of the substrate and which emits light in a range from ultraviolet ray to visible light;a first light transmissible layer which covers the semiconductor light-emitting element and contacting with the plane surface of the substrate;a phosphor layer which covers the first light transmissible layer, the phosphor layer contacting with the plane surface of the substrate and containing phosphor particles and matrix, a surface of the phosphor layer having projections reflecting shapes of the phosphor particles; anda second light transmissible layer which covers the phosphor layer and contacting with the plane surface of the substrate.

2. The light-emitting device according to claim 1 , wherein the phosphor layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an inner periphery of the cross-section being either semi-arc-shaped, palabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

3. The light-emitting device according to claim 1, wherein the first light transmissible layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an outer periphery of the cross-section being either semi-arc-shaped, palabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

4. The light-emitting device according to claim 1, wherein the second light transmissible layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an outer periphery of the cross-section being either semi-arc-shaped, palabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

5. The light-emitting device according to claim 1, further comprising at least one another phosphor layer adjacent to the phosphor layer or inside of the first light transmissible layer or outside of the second light transmissible layer, the phosphor particles contained in respective phosphor layers being different in at least one of kind and concentration.

6. The light-emitting device according to claim 1, further comprising a third light transmissible layer above the second light transmissible layer, an refractive index of the third light transmissible layer being different from that of the second light transmissible layer.

7. The light-emitting device according to claim 1, further comprising at least one another phosphor layer between the first and second light transmissible layers, and a third light transmissible layer being sandwiched between adjacent phosphor layers.

8. The light-emitting device according to claim 1, wherein the phosphor particles are contained in the phosphor layer at a concentration of 20 wt % or more.

9. The light-emitting device according to claim 1, wherein an edge of the second light transmissible layer coincides with an outline of the substrate.

10. The light-emitting device according to claim 1, wherein the phosphor particles has a diameter ranging from 45 μm to 70 μm.

11. A light-emitting device comprising: a substrate having a plane surface;a semiconductor light-emitting element mounted on the plane surface of the substrate and which emits light in the range from ultraviolet ray to visible light;a first light transmissible layer which covers the semiconductor light-emitting element and contacting with the plane surface of the substrate;a phosphor layer which covers the first light transmissible layer, the phosphor layer contacting with the plane surface of the substrate and containing phosphor particles and matrix, a concentration of the phosphor particles being 20 wt % or more; anda second light transmissible layer which covers the phosphor layer and contacting with the plane surface of the substrate.

12. The light-emitting device according to claim 11, wherein the phosphor layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an inner periphery of the cross-section being either semi-arc-shaped, palabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

13. The light-emitting device according to claim 11, wherein the first light transmissible layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an outer periphery of the cross-section being either semi-arc-shaped, palabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

14. The light-emitting device according to claim 11, wherein the second light transmissible layer has a cross-section perpendicular to the plane surface of the substrate, a shape of an outer periphery of the cross-section being either semi-arc-shaped, palabola-shaped, or U-shaped, or cornered-shaped having at least two straight lines.

15. The light-emitting device according to claim 11, further comprising at least one another phosphor layer adjacent to the phosphor layer or inside of the first light transmissible layer or outside of the second light transmissible layer, the phosphor particles contained in respective phosphor layers being different in at least one of kind and concentration.

16. The light-emitting device according to claim 11, further comprising a third light transmissible layer above the second light transmissible layer, an refractive index of the third light transmissible layer being different from that of the second light transmissible layer.

17. The light-emitting device according to claim 11, further comprising at least one another phosphor layer between the first and second transmissible layers, and a third light transmissible layer being sandwiched between adjacent phosphor layers.

18. The light-emitting device according to claim 11, wherein a surface of the phosphor layer having projections reflecting shapes of the phosphor particles.

19. The light-emitting device according to claim 11, wherein an edge of the second light transmissible layer coincides with an outline of the substrate.

20. The light-emitting device according to claim 11, wherein the phosphor particles have a diameter ranging from 45 μm to 70 μm.