LED device

Patent metadata

Field	Value
Publication number	US-10069047-B1
Application number	US-201815892358-A
Country	US
Kind code	B1
Filing date	Feb 8, 2018
Priority date	Jan 16, 2018
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A LED device includes LED chips mounted on a substrate, a first fluorescent layer, a second fluorescent layer and a package housing. The LED chips emit a blue light. The first fluorescent layer has a first side facing to the LED chips for converting the blue light to a red light. The second fluorescent layer has a first side attached to a second side of the first fluorescent layer for converting the blue light to a red light emitted from a second side of the second fluorescent layer. The package housing holds the substrate and the first fluorescent layer.

First claim

The invention claimed is:

1. A LED device, comprising:
a LED module comprising a plurality of LED components mounted on a substrate for emitting an original light of an original spectrum;
a first fluorescent layer surrounding the plurality of LED components for converting the original light to a first output light of a first spectrum;
a second fluorescent layer stacked on the first fluorescent layer for converting the original light not absorbed by the first fluorescent layer and entering the second fluorescent layer to generate a second output light of a second spectrum,
wherein the second spectrum is partially overlapped with an excitation spectrum of the first fluorescent layer, and
wherein there is an intermediate part between the first fluorescent layer and the second fluorescent layer, the intermediate part comprising mixed materials of the first fluorescent layer and the second fluorescent layer, and the intermediate part has a plurality of micro convex structures between the first fluorescent layer and the second fluorescent layer.

2. The LED device of claim 1 , wherein the first fluorescent layer is a dome shape and the second fluorescent layer and the substrate surround the first fluorescent layer.

3. The LED device of claim 1 , further comprising a package housing, wherein the package housing and the substrate form a container for storing the first fluorescent layer.

4. The LED device of claim 3 , wherein the package housing has a surrounding side wall with larger peripheral size at top than at bottom.

5. The LED device of claim 3 , wherein the package housing has a surrounding side wall with a reflecting surface facing to the first fluorescent layer.

6. The LED device of claim 1 , wherein a heat dissipation material is mixed in the first fluorescent layer.

7. The LED device of claim 1 , wherein the first fluorescent layer and the second fluorescent layer have phosphor material, and the phosphor material has larger density near bottom than top in the first fluorescent layer and the second fluorescent layer.

8. The LED device of claim 1 , further comprising a package housing, wherein the package housing has a side wall with a convex structure engaging the first fluorescent layer.

9. The LED device of claim 1 , further comprising a package housing, wherein the package housing has a side wall with a concave structure engaging the first fluorescent layer.

10. The LED device of claim 1 , wherein the first fluorescent layer has a first convex surface on top of the first fluorescent layer, the second fluorescent layer has a second convex surface on top of the second fluorescent layer.

11. The LED device of claim 10 , wherein the first convex surface and the second convex surface forming lens guiding the first output light and the second output light for mixing the first output light and the second output light.

12. The LED device of claim 1 , wherein the first fluorescent layer has a first concave surface on top of the first fluorescent layer, the second fluorescent layer has a second concave surface on top of the second fluorescent layer.

13. The LED device of claim 1 , wherein an intermediate surface between the first fluorescent layer and the second fluorescent layer is a convex curve surface.

14. The LED device of claim 1 , wherein an intermediate surface between the first fluorescent layer and the second fluorescent layer is a concave curve surface.

15. The LED device of claim 1 , wherein the first output light, the second light and the original light not absorbed by the first fluorescent layer and the second fluorescent layer form an overall output spectrum of a white light.

16. The LED device of claim 15 , wherein the first fluorescent layer and the second fluorescent layer both comprise red phosphor material for generating 640-650 nm output light.

17. The LED device of claim 15 , wherein the first fluorescent layer and the second fluorescent layer both comprise red phosphor material for generating 628-635 nm output light.

18. The LED device of claim 1 , wherein the original spectrum is substantially corresponding to a ultraviolet light, the second fluorescent layer comprises green phosphor material and blue phosphor material for generating a green light and a blue light, the first fluorescent layer comprises red phosphor material for generating a red light.

19. The LED device of claim 1 , further comprising a third fluorescent layer having blue phosphor material for generating blue light spectrum, wherein the second fluorescent layer comprises green phosphor material for generating a green light, and the first fluorescent layer comprises red phosphor material for generating a red light.

20. The LED device of claim 1 , wherein the first fluorescent layer comprises red phosphor material and green phosphor material for generating a red light and a green light and the second fluorescent layer comprises blue phosphor material for generating a blue light.

Assignees

• Leedarson Lighting Co Ltd

Inventors

• Chen Yanbiao
• Cao Liangliang
• Chen Huiwu
• Wang Qiyuan

Classifications

• H10W90/00

  Package configurations · CPC title

• H01L33/505

  Electricity · mapped topic

• H01L33/62

  Electricity · mapped topic

• H01L25/0753

  Electricity · mapped topic

• H01L33/60

  Electricity · mapped topic