Light-emitting device

• US 9,922,963 B2
• Filed: 09/19/2016
• Issued: 03/20/2018
• 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
• Primary Examiner(s): Han, Jonathan
• Application Number:
  US15/268,681
• Publication Number:
  US 20170084587A1
• Time in Patent Office: 547 Days
• Field of Search: 257 81, 257 82, 257 91, 257 98, 257 99, 257100, 257116, 257117, 257432-437, 257749, 257E33056-E33059, 257E25032
• 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;

at least one light-emitting component disposed on the substrate;

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

a translucent adhesive layer adhering the light-emitting component to the wavelength conversion layer and encapsulating an upper surface and a first portion of the lateral surface of the light-emitting component, wherein the high-density phosphor layer is located between the low-density phosphor layer and the translucent adhesive layer; and

a reflective layer formed above the substrate and covering a second portion of the lateral surface of the light-emitting component, a lateral surface of the translucent adhesive layer and a lateral surface of the wavelength conversion layer, wherein the reflective layer has a first reflective surface inclined to the lateral surface of the light-emitting component and at least facing the translucent adhesive layer;

wherein the wavelength conversion layer has a first area disposed above the light-emitting component and a second area disposed above the first reflective surface, and a thickness of the high-density phosphor layer over the first area and the second area is substantially uniform;

wherein the light-emitting device has a flat lateral surface comprising the reflective layer and the substrate.

2. 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.

3. The light-emitting device according to claim 2,

wherein a quantity of the light-emitting component is two or more and the translucent adhesive layer further comprises a second lateral portion formed between adjacent two of the light-emitting components.

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

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

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

7. The light-emitting device according to claim 6, wherein the second reflective portion has a second reflective surface, and the second reflective surface is a concave surface facing the wavelength conversion layer.

8. The light-emitting device according to claim 6, wherein the second reflective portion has a second reflective surface, and the second reflective surface is a convex surface facing the wavelength conversion layer.

9. The light-emitting device according to claim 1, wherein the first reflective surface is a convex surface.

10. The light-emitting device according to claim 9, wherein the convex surface connects a lower surface of the wavelength conversion layer to the lateral surface of the light-emitting component.

11. The light-emitting device according to claim 1, wherein a quantity of the light-emitting component is two or more and the reflective layer further comprises a second reflective portion formed between adjacent two of the light-emitting components.

12. The light-emitting device according to claim 1,

wherein a quantity of the light-emitting component is two or more and 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.

13. 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.

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