Light-emitting device and method for manufacturing the light-emitting device having a first dielectric multilayer film arranged on the side surface of the light emitting element

Patent metadata

Field	Value
Publication number	US-10797203-B2
Application number	US-201916280045-A
Country	US
Kind code	B2
Filing date	Feb 20, 2019
Priority date	Feb 21, 2018
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A light emitting device includes a light-transmissive member including a first surface, a second surface opposite to the first surface, and third surfaces connected to the first surface and the second surface. A phosphor layer faces the second surface of the light-transmissive member. A reflective member faces side surfaces of the phosphor layer and the third surfaces of the light-transmissive member. The light-emitting element has a top surface facing the phosphor layer, a bottom surface opposite to the top surface, and side surfaces connecting the top surface and the bottom surface. The phosphor layer has a bonding surface facing the light emitting element. A first dielectric multilayer film is arranged on at least one of side surfaces of the light-emitting element without being provided on the bonding surface of the phosphor layer.

First claim

What is claimed is:

1. A light-emitting device comprising:
a light-transmissive member including a first surface, a second surface opposite to the first surface, and third surfaces connected to the first surface and the second surface;
a phosphor layer facing the second surface of the light-transmissive member;
a reflective member facing side surfaces of the phosphor layer and the third surfaces of the light-transmissive member;
a light-emitting element having a top surface facing the phosphor layer, a bottom surface opposite to the top surface, and side surfaces connecting the top surface and the bottom surface, the phosphor layer having a bonding surface facing the light emitting element; and
a first dielectric multilayer film arranged on at least one of the side surfaces of the light-emitting element without being provided on the bonding surface of the phosphor layer.

2. The light-emitting device according to claim 1 , further comprising a second dielectric multilayer film disposed between the light-transmissive member and the phosphor layer.

3. The light-emitting device according to claim 1 ,
wherein the light-transmissive member has a flat plate shape.

4. The light-emitting device according to claim 1 ,
wherein the phosphor layer and the light-emitting element are directly bonded to each other.

5. The light-emitting device according to claim 1 ,
wherein the phosphor layer is bonded to the light-emitting element via a bonding member.

6. The light-emitting device according to claim 5 ,
wherein the first dielectric multilayer film is arranged on the side surfaces of the light-emitting element, and
wherein the bonding member is arranged on the top surface of the light-emitting element and the first dielectric multilayer film.

7. The light-emitting device according to claim 6 ,
wherein a shape of the bonding member which is arranged on the side surfaces of the light-emitting element is a substantially triangle in a vertical sectional view.

8. The light-emitting device according to claim 1 , further comprising a base having a recess, the light-emitting element being arranged on a bottom surface of the recess of the base, the reflective member being filled into the recess.

9. The light-emitting device according to claim 1 , further comprising a covering layer, the covering layer being provided between the reflective member and each of the third surfaces of the light-transmissive member and side surfaces of the phosphor layer.

10. The light-emitting device according to claim 9 ,
wherein the light-emitting element is configured to emit a light having a wavelength in a range of near-ultraviolet light to blue light,
wherein the phosphor layer is configured to convert at least part of the light emitted from the light-emitting element to a light having a wavelength in a range of blue-green to red light, and
wherein the covering layer is configured to convert at least part of the light emitted from the light-emitting element to a light having a wavelength in a range of blue-green to red light.

11. The light-emitting device according to claim 1 ,
wherein an area of the light-emitting element is smaller than an area of the phosphor layer in plan view.

12. The light-emitting device according to claim 1 ,
wherein the first dielectric multilayer film is arranged on all of the side surfaces of the light-emitting element.

13. A light-emitting device comprising:
a light-transmissive member including a first surface, a second surface opposite to the first surface, and third surfaces connected to the first surface and the second surface;
a phosphor layer facing the first surface of the light-transmissive member;
a reflective member facing side surfaces of the phosphor layer and the third surfaces of the light-transmissive member;
a light-emitting element having a top surface facing the light-transmissive member, a bottom surface opposite to the top surface, and side surfaces connecting the top surface and the bottom surface, the phosphor layer having a bonding surface facing the light emitting element; and
a first dielectric multilayer film arranged on at least one of the side surfaces of the light-emitting element without being provided on the bonding surface of the phosphor layer.

14. The light-emitting device according to claim 13 , further comprising a second dielectric multilayer film disposed between the light-transmissive member and the phosphor layer.

15. A light-emitting device comprising:
a phosphor block having an upper surface, a lower surface opposite to the upper surface, and side surfaces connecting the upper surface and the lower surface;
a reflective member arranged on the side surfaces of the phosphor block;
a light-emitting element arranged under the lower surface of the phosphor block, the lower surface of the phosphor block having a bonding surface facing the light-emitting element; and
a first dielectric multilayer film arranged on at least one of side surfaces of the light-emitting element without being provided on the bonding surface of the phosphor block.

16. A method of manufacturing a light-emitting device, comprising:
providing a first member including a light-transmissive member and a phosphor layer, the light-transmissive member including a first surface, a second surface opposite to the first surface, and third surfaces connected to the first surface and the second surface, the phosphor layer facing the second surface of the light-transmissive member;
mounting on a base, a light-emitting element having a bottom surface facing the base, a top surface opposite to the bottom surface, and side surfaces contacting the top surface and the bottom surface;
providing a first dielectric multilayer film on at least one of the side surfaces of the light-emitting element;
bonding the light-emitting element to the first member; and
providing a reflective member to cover at least parts of side surfaces of the phosphor layer and the third surfaces of the light-transmissive member.

17. The method according to claim 16 ,
wherein the providing the first member includes:
forming a second dielectric multilayer film on the second surface of the light-transmissive member;
forming the phosphor layer on the second dielectric multilayer film; and
singulating the light-transmissive member with the second dielectric multilayer film and the phosphor layer thereon.

18. A method of manufacturing a light-emitting device, comprising:
providing a second member including a light-transmissive member, a phosphor layer, a light-emitting element, and a first dielectric multilayer film, the light-transmissive member including a first surface, a second surface opposite to the first surface, and third surfaces connected to the first surface and the second surface, the phosphor layer facing the second surface of the light-transmissive member, the light-emitting element having a top surface facing the phosphor layer, a bottom surface opposite to the top surface, and side surfaces connecting the top surface and the bottom surface, the first dielectric multilayer film being arranged on at least one of the side surfaces of the light-emitting element;
mounting the light-emitting element of the second member on a base; and
providing a reflective member to cover at least parts of side surfaces of the phosphor layer and the third surfaces of the light-transmissive member.

19. The method according to claim 18 ,
wherein providing the second member includes:
forming a second dielectric multilayer film on the second surf

Assignees

• Nichia Corp

Inventors

• Iwakura Daisuke
• Inoue Yoshiki

Classifications

• C09K11/77348

  Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides · CPC title

• H10H20/8516

  having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer or wavelength conversion layer with a concentration gradient · CPC title

• H10H20/853

  characterised by their shape · CPC title

• H10H20/0363

  of optical field-shaping means · CPC title

• H10H20/0361

  of wavelength conversion means · CPC title