LIGHT-EMITTING DEVICE

• US 20170084587A1
• Filed: 09/19/2016
• Published: 03/23/2017
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Genesis Photonics Inc.
• Inventors: HUNG, Cheng-Wei, CHANG, JUI-FU, Hung, Chin-Hua, Lin, Yu-Feng
• Granted Patent: US 9,922,963 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A light-emitting device includes a substrate, a light-emitting component, a wavelength conversion component, an adhesive and a reflective layer. The light-emitting component is disposed on the substrate. The wavelength conversion component includes a high-density phosphor layer and a lower-density phosphor layer. The adhesive is formed between the light-emitting device and the high-density phosphor layer. The reflective layer is formed above the substrate and covers a lateral surface of the light-emitting component, a lateral surface of the adhesive and a lateral surface of the wavelength conversion component.

Claims

1. A light-emitting device, comprises:

a substrate;

a light-emitting component disposed on the substrate;

a wavelength conversion layer comprising a high-density phosphor layer and a low-density phosphor layer;

an adhesive layer formed between the light-emitting component and the high-density phosphor layer; and

a reflective layer formed above the substrate and covering a lateral surface of the light-emitting component, a lateral surface of the adhesive layer and a lateral surface of the wavelength conversion layer.

2. The light-emitting device according to claim 1, wherein the substrate has a lateral surface and the reflective layer further covers the lateral surface of the substrate.

3. The light-emitting device according to claim 1, wherein the light-emitting component comprises a first electrode and a second electrode, and the reflective layer further covers a lateral surface of the first electrode and a lateral surface of the second electrode.

4. The light-emitting device according to claim 1, wherein the adhesive layer comprises a first lateral portion, the first lateral portion covers a portion of the lateral surface of the light-emitting component, and the reflective layer covers another portion of the lateral surface of the light-emitting component.

5. The light-emitting device according to claim 1, wherein the reflective layer covers the entire lateral surface of the light-emitting component.

6. The light-emitting device according to claim 1, wherein the wavelength conversion layer covers the entire light-emitting component.

7. The light-emitting device according to claim 1, wherein an area of the wavelength conversion layer is equal to or larger than an area of the light-emitting component.

8. The light-emitting device according to claim 7, wherein a ratio of the area of the wavelength conversion layer and the area of the light-emitting component ranges between 1 and 1.35.

9. The light-emitting device according to claim 1, wherein the reflective layer comprises a first reflective portion, and the first reflective portion surrounds the light-emitting component.

10. The light-emitting device according to claim 9, wherein the first reflective portion has a first reflective surface facing the lateral surface of the light-emitting component.

11. The light-emitting device according to claim 10, wherein the first reflective surface is a convex surface facing the lateral surface of the light-emitting component.

12. The light-emitting device according to claim 11, wherein the convex surface connects a lower surface of the wavelength conversion layer to the lateral surface of the light-emitting component.

13. The light-emitting device according to claim 1, comprising:

a plurality of the light-emitting components disposed on the substrate;

wherein the adhesive layer comprises a second lateral portion formed between adjacent two of the light-emitting components.

14. The light-emitting device according to claim 1, comprising:

a plurality of the light-emitting components disposed on the substrate;

wherein the reflective layer comprises a second reflective portion formed between adjacent two of the light-emitting components.

15. The light-emitting device according to claim 14, wherein the second reflective portion has a second reflective surface, and the second reflective surface is a concave surface facing the wavelength conversion layer.

16. The light-emitting device according to claim 14, wherein the second reflective portion has a second reflective surface, and the second reflective surface is a convex surface facing the wavelength conversion layer.

17. The light-emitting device according to claim 1, wherein, comprising:

a plurality of the light-emitting components disposed on the substrate;

wherein each light-emitting component comprises a first electrode and a second electrode, and the reflective layer covers a lateral surface of the first electrode and a lateral surface of the second electrode.

18. The light-emitting device according to claim 1, wherein a ratio of a phosphor particle density of the high-density phosphor layer and a phosphor particle density of the low-density phosphor layer ranges between 1 and 10¹⁵.

19. The light-emitting device according to claim 1, wherein a ratio of a thickness of the low-density phosphor layer and a thickness of the high-density phosphor layer ranges between 1 and 1000.