Photoluminescent sheet

• US 8,237,352 B2
• Filed: 10/26/2006
• Issued: 08/07/2012
• Est. Priority Date: 03/15/2006
• Status: Active Grant

• Current Assignee: Light Guide Innovations LLC (Anjay Venture Partners LLC)
• Original Assignee: KDT Co., LTD., LG Innotek Company Limited (LG Corporation)
• Inventors: Sohn, Choong-Yong, Ahn, Young-Joo, Ko, Young-Wook
• Primary Examiner(s): Williams, Joseph L
• Assistant Examiner(s): LEE, NATHANIEL J.
• Application Number:
  US12/282,973
• Publication Number:
  US 20090212257A1
• Time in Patent Office: 2,112 Days
• Field of Search: 313498-512
• US Class Current: 313/503
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/422 Luminescent, fluorescent, phosphorescent
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/26 using curing agents
• CPC Class Codes: B32B 27/283 comprising polysiloxanes
• CPC Class Codes: B32B 27/365 comprising polycarbonates
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

A photoluminescent sheet is disclosed. A photoluminescent sheet that includes a matrix resin layer, which is a thermosetting resin; a phosphor, which is included in the matrix resin layer and which converts the wavelength of light emitted from a blue LED; a curing agent, which is included in the matrix resin layer and which cures liquid thermosetting resin; and an additive, which is included in the matrix resin layer and which disperses the phosphor uniformly within the matrix resin layer, can implement white light from light having wavelengths corresponding to blue color.

Claims

1. A photoluminescent sheet comprising:

a resin layer;

a phosphor configured to convert a wavelength of light emitted from an LED in the resin layer;

a curing agent in the resin layer;

an additive configured to disperse the phosphor in the resin layer;

a first protective film of uniform thickness on a top surface of the resin layer, wherein the first protective film is formed of a trans went synthetic resin which is not curable by light; and

a second protective film of uniform thickness on a bottom surface of the resin layer, wherein the second protective film is formed of a transparent synthetic resin which is not curable by light.

2. The photoluminescent sheet of claim 1, further comprising:

a diffusing agent configured to refract light in the resin layer.

3. The photoluminescent sheet of claim 2, wherein the phosphor comprises a yellow phosphor, and

wherein the photoluminescent sheet comprises 0.05˜

5 parts by weight of the curing agent, 0.1˜

15 parts by weight of the additive, 5˜

15 parts by weight of the diffusing agent, and 1˜

90 parts by weight of the yellow phosphor, per 100 parts by weight of the resin layer.

4. The photoluminescent sheet of claim 2, wherein the phosphor comprises a green phosphor, a yellow phosphor, and a red phosphor, and

wherein the photoluminescent sheet comprises 0.055 parts by weight of the curing agent, 0.1˜

15 parts by weight of the additive, 5˜

15 parts by weight of the diffusing agent, 1˜

30 parts by weight of the green phosphor, 0.1˜

60 parts by weight of the yellow phosphor, and 1˜

30 parts by weight of the red phosphor, per 100 parts by weight of the resin layer.

5. The photoluminescent sheet of claim 2, wherein the phosphor comprises a green phosphor and a red phosphor, and

wherein the photoluminescent sheet comprises 0.055 parts by weight of the curing agent, 0.1˜

15 parts by weight of the additive, 5˜

15 parts by weight of the diffusing agent, 1˜

50 parts by weight of the green phosphor, and 1˜

50 parts by weight of the red phosphor, per 100 parts by weight of the resin layer.

6. The photoluminescent sheet of claim 1, wherein the resin layer is formed of thermosetting resin.

7. The photoluminescent sheet of claim 1, wherein the resin layer comprises a silicone resin.

8. The photoluminescent sheet of claim 1, wherein the phosphor comprises a yellow phosphor, and

wherein the photoluminescent sheet comprises 0.05˜

5 parts by weight of the curing agent, 0.1˜

15 parts by weight of the additive, and 1˜

90 parts by weight of the yellow phosphor, per 100 parts by weight of the resin layer.

9. The photoluminescent sheet of claim 1, wherein the phosphor comprises a green phosphor, a yellow phosphor, and a red phosphor, and

wherein the photoluminescent sheet comprises 0.0˜

55 parts by weight of the curing agent, 0.1˜

15 parts by weight of the additive, 1˜

30 parts by weight of the green phosphor, 0.1˜

60 parts by weight of the yellow phosphor, and 1˜

30 parts by weight of the red phosphor, per 100 parts by weight of the resin layer.

10. The photoluminescent sheet of claim 1, wherein the phosphor comprises a green phosphor and a red phosphor, and

wherein the photoluminescent sheet comprises 0.05˜

5 parts by weight of the curing agent, 0.1˜

15 parts by weight of the additive, 1˜

65 parts by weight of the green phosphor, and 1˜

65 parts by weight of the red phosphor, per 100 parts by weight of the resin layer.

11. The photoluminescent sheet of claim 1,

wherein at least one of the first and second protective films is formed of PET, polyethylene naphthalate, acrylic resin, polycarbonate, or polystyrene.

12. The photoluminescent sheet of claim 11, further comprising a third protective film on at least one of the first and second protective films.

13. The photoluminescent sheet of claim 11, further comprising:

balls on at least one of the first and second protective films; and

an attachment layer for attaching the balls to at least one of the first and second protective films.

14. A photoluminescent sheet comprising:

a matrix layer having top and bottom surfaces that are substantially parallel to each other, the top and bottom surfaces of the matrix layer being substantially flat;

a phosphor configured to convert a wavelength of light in the matrix layer;

a first layer directly on a top surface of the matrix layer, wherein the first layer is formed of a material which is not an adhesive; and

a second layer directly on a bottom surface of the matrix layer, wherein the second layer is formed of a material which is not an adhesive,

wherein top surfaces of the first and second layers are substantially parallel to the top and bottom surfaces of the matrix layer, respectively,

wherein the matrix layer is thicker than the first layer or the second layer, and

wherein ends of the matrix layer and the second layer are aligned with each other.

15. The photoluminescent sheet of claim 14, wherein the matrix layer comprises a silicone resin.

16. The photoluminescent sheet of claim 14, wherein the first and second layers are for protecting the matrix layer and comprise a transparent synthetic resin.

17. A light device comprising:

a light emitting diode; and

a conversion member configured to convert a wavelength of light emitted from the light emitting diode,

wherein the conversion member comprises,

a matrix layer having top and bottom surfaces that are substantially parallel to each other, the top and bottom surfaces of the matrix layer being substantially flat;

a phosphor configured to convert a wavelength of light emitted from the light emitting diode in the matrix layer;

a first layer directly on a top surface of the matrix layer, wherein the first layer is formed of a material which is not curable by light; and

a second layer directly on a bottom surface of the matrix layer, wherein the second layer is formed of a material which is not an adhesive,

wherein top surfaces of the first and second layers are substantially parallel to the top and bottom surfaces of the matrix layer, respectively,

wherein the matrix layer is thicker than the first layer or the second layer, and

wherein ends of the matrix layer and the second layer are aligned with each other.

18. The light device of claim 17, wherein the matrix layer comprises a silicone resin.

19. The light device of claim 17, wherein the first and second layers are for protecting the matrix layer and comprise a transparent synthetic resin.