Lighting device comprising photoluminescent plate

• US 8,847,481 B2
• Filed: 11/07/2011
• Issued: 09/30/2014
• Est. Priority Date: 11/08/2010
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Jong Chan, Kim, Young Jin
• Primary Examiner(s): Hollweg, Thomas A
• Application Number:
  US13/290,477
• Publication Number:
  US 20120112630A1
• Time in Patent Office: 1,058 Days
• Field of Search: 313/498, 313/501, 313/502, 313/506, 362/260, 362/268, 362/293, 362/307, 362/308, 362/311.02
• US Class Current: 313/506
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/08 the material comprising photoluminescent substances
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lighting device including a photoluminescent plate may be provided that includes a light source and a photoluminescent plate disposed over the light source. The photoluminescent plate includes a base layer and a first phosphor layer. The base layer transmits light and has a first roughness on one surface thereof. The first phosphor layer is disposed on the one surface of the base layer and includes a first phosphor.

Claims

1. A lighting device comprising:

a light source;

a photoluminescent plate comprising;

a first phosphor layer disposed above the light source, the first phosphor layer including a yellow phosphor;

a base layer that transmits light and including one surface having a first roughness and an other surface having a second roughness, the base layer disposed on the first phosphor layer; and

a second phosphor layer disposed on the other surface of the base layer, the second phosphor layer including a red phosphor,

wherein the photoluminescent plate and the light source are spaced apart from each other by 5 to 10 mm,

wherein the base layer is a diffuser substrate or a diffuser plate,

wherein the first roughness and the second roughness are different from each other, and

wherein the first roughness has a uniform roughness and the second roughness has a non-uniform roughness.

2. The lighting device of claim 1, wherein the base layer further comprises a function of diffusing light.

3. The lighting device of claim 1, wherein the first phosphor layer further comprises at least one of a diffusing agent, an antifoaming agent, and a curing agent.

4. The lighting device of claim 1, wherein the first phosphor layer further comprises at least one of a red, green and blue phosphor.

5. The lighting device of claim 1, wherein the base layer further comprises a diffusing agent.

6. The lighting device of claim 1, further comprising a reflector disposed to surround the light source.

7. The lighting device of claim 6, further comprising a housing which receives the photoluminescent plate, the light source and the reflector and radiates heat from the light source.

8. The lighting device of claim 1, wherein the photoluminescent plate is convex.

9. A lighting device comprising:

a light source comprising;

a substrate;

a light emitting device disposed on the substrate; and

a photoluminescent layer disposed on the substrate to be adjacent to the light emitting device and including at least one phosphor; and

a photoluminescent plate comprising;

a base layer transmitting light;

a first phosphor layer which is disposed above the light source, the first phosphor layer being on one surface of the base layer and including a yellow phosphor; and

a second phosphor layer which is disposed on an other surface of the base layer and including a red phosphor,

wherein the base layer is a diffuser substrate or a diffuser plate, and

wherein the one surface of the base layer has a uniform first roughness and the other surface of the base layer has a non-uniform second roughness.

10. The lighting device of claim 9, wherein the base layer further comprises a function of diffusing light.

11. The lighting device of claim 9, wherein the photoluminescent plate is convex.

12. A lighting device comprising:

a housing;

a reflector disposed on the inner surface of the housing;

a light source disposed on the reflector; and

a photoluminescent plate disposed above the light source and contacting the housing and the reflector,

wherein the photoluminescent plate includes;

a base layer, a first phosphor layer and a second phosphor layer,

wherein the base layer transmits light and includes one surface having a first roughness and an other surface having a second roughness,

wherein the first phosphor layer is disposed on the one surface of the base layer and includes a yellow phosphor,

wherein the second phosphor layer is disposed on an other surface of the base layer and includes a red phosphor,

wherein the first roughness and the second roughness are different from each other, and

wherein the first roughness has a uniform roughness and the second roughness has a non-uniform roughness.

13. The lighting device of claim 12, wherein the base layer further comprises a function of diffusing light.

14. The lighting device of claim 12, wherein the photoluminescent plate is convex.

15. The lighting device of claim 12, wherein the housing comprises:

a bottom surface; and

a side surface extending from an end of the bottom surface and having an inclination with respect to the end of the bottom surface.

16. The lighting device of claim 15, wherein the reflector comprises:

a bottom reflector; and

a side reflector extending from an end of the bottom reflector and having an inclination with respect to the end of the bottom reflector.

17. The lighting device of claim 16, wherein the photoluminescent plate contacts the side surface of the housing and the side reflector.

18. The lighting device of claim 12, wherein the light source comprises:

a substrate disposed on the reflector;

a light emitting device disposed on the substrate; and

a photoluminescent layer disposed on the substrate in such a manner as to be adjacent to the light emitting device and including at least one phosphor.

19. The lighting device of claim 12, wherein the base layer is a diffuser substrate or a diffuser plate.