LED lighting arrangement including light emitting phosphor

• US 20080029720A1
• Filed: 12/15/2006
• Published: 02/07/2008
• Est. Priority Date: 08/03/2006
• Status: Abandoned Application

• Current Assignee: Intematix Corporation
• Original Assignee: Intematix Corporation
• Inventors: Li, Yi-Qun
• Application Number:
  US11/640,533
• Publication Number:
  US 20080029720A1
• Time in Patent Office: Days
• US Class Current: 250/581
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/77342 Silicates
• CPC Class Codes: C09K 11/7741 Sulfates
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: F21V 13/14 the elements being filters or photoluminescent elements, reflectors and refractors
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 5/041 Ball lenses
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

A lighting arrangement (20) comprises: a radiation source, LED chip, (22) configured to emit radiation having a first wavelength range; a phosphor, photoluminescent material, (30) configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and an optical component, lens, (26) through which at least said first wavelength range radiation passes. The LED is characterized in that the phosphor is provided on a surface (28) of the optical component.

Claims

1. A lighting arrangement comprising:

a radiation source configured to emit radiation having a first wavelength range;

a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and

an optical component through which at least said first wavelength range radiation passes, characterized in that the phosphor is provided on a surface of the optical component.

2. The lighting arrangement according to claim 1, in which the phosphor is provided as a substantially uniform thickness layer on said surface of the optical component.

3. The lighting arrangement according to claim 1 or claim 2, in which the optical component has a substantially planar surface and the phosphor is provided on said substantially planar surface.

4. The lighting arrangement according to claim 1 or claim 2, in which the optical component has a convex surface and the phosphor is provided on said convex surface.

5. The lighting arrangement according to claim 1 or claim 2, in which the optical component has a concave surface and the phosphor is provided on said concave surface.

6. The lighting arrangement according to claim 1 or claim 2, in which the optical component has a substantially hemispherical surface and the phosphor is provided on said hemispherical surface.

7. The lighting arrangement according to claim 6, in which the optical component comprises a substantially hemispherical shell and the phosphor is provided on the inner hemispherical surface.

8. The lighting arrangement according to claim 6, in which the optical component comprises a substantially hemispherical shell and the phosphor is provided on at least a part of the outer hemispherical surface.

9. The lighting arrangement according to claim 1 or claim 2, in which the optical component comprises a substantially spherical shell and the phosphor is provided on at least a part of the inner spherical surface.

10. The lighting arrangement according to claim 1 or claim 2, in which the optical component comprises a substantially spherical shell and the phosphor is provided on at least a part of the outer spherical surface.

11. The lighting arrangement according to claim 1 or claim 2, in which the optical component comprises a hollow cylinder and the phosphor is provided on at least a part of the inner surface.

12. The lighting arrangement according to claim 1 or claim 2, in which the optical component comprises a hollow cylinder and the phosphor is provided on at least a part of the outer surface.

13. The lighting arrangement according to claim 1 to 2, in which the optical component is made from one of a plastics material, glass.

14. The lighting arrangement according to claim 1, in which the phosphor comprises a powder which is incorporated within one of an epoxy resin, a silicone material and a polymer material to form a mixture and in which the phosphor mixture is applied to the optical component to form a layer of phosphor on the optical component surface.

15. The lighting arrangement according to claim 14, and further comprising incorporating a light diffusing material with the phosphor powder.

16. The lighting arrangement according to any of claims 1, 2, 14 or 15, in which the phosphor comprises a photoluminescent material having a formula A₂SiO₄:

Eu²⁺D where A is a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.

17. The lighting arrangement according to any one of claims 1, 2, 14 or 15, in which the phosphor comprises a photoluminescent material having a formula (YA)₃(AlB)₅(OC)₁₂:

Ce³⁺ where A is a trivalent metal selected from the group consisting of Gd, Tb, La, Sm or divalent metal ions such as Sr, Ca, Ba, Mg, Zn and Cd;

B is selected from the group consisting of Si, B, P, and Ga; and

C is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.

18. The lighting arrangement according to any one of claims 1, 2, 14 or 15, in which the phosphor comprises an orange-red silicate-based phosphor having a formula (SrM1)₃Si(OD)₅:

Eu where M1 is selected from the group consisting of Ba, Ca, Mg, Zn . . . ; and

D is selected from the group consisting of F, Cl, S, and N.

19. The lighting arrangement according to any one of claims 1, 214 or 15, in which the phosphor comprises a red silicon nitride based phosphor having a formula (SrM1)Si₅N₈ where M1 is selected from the group consisting Sr, Ca, Mg, and Zn.

20. The lighting arrangement according to any one of claims 1, 2, 14 or 15, in which the phosphor comprises a red sulfate based phosphor having a formula (SrM1)S where M1 is selected from the group consisting of Ca, Ba, and Mg.

21. The lighting arrangement according to any one of claims 1, 214 or 15, in which the phosphor comprises a green sulfate based phosphor having a formula (SrM1)(GaM2)₂S₄:

Eu where M1 is selected from the group consisting of Ca, Ba, and Mg, and M2 is selected from the group consisting of Al and In.

22. The lighting arrangement according to claim 1, in which the radiation source comprises a light emitting diode.

23. The lighting arrangement according to claim 1, in which said LED chip comprises a Gallium Nitride LED.

24. The lighting arrangement according to claim 1, in which said radiation source is operable to emit radiation having a wavelength range of 300 to 500 nm.

25. The lighting arrangement according to claim 1, in which the phosphor is configured to emit radiation having a wavelength ranging from 450 to 700 nm.

26. An optical component for a lighting arrangement of a type comprising a radiation source configured to emit radiation having a first wavelength range;

a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and

said optical component being configured such that at least said first wavelength range radiation passes though the optical component, and characterized in that said phosphor is provided on a surface of said optical component.

27. The optical component according to claim 26, in which the phosphor is provided as a substantially uniform thickness layer on said surface of the optical component.

28. The optical component according to claim 26 or claim 27, in which the optical component has a substantially planar surface and the phosphor is provided on said substantially planar surface.

29. The optical component according to claim 26 or claim 27, in which the optical component has a convex surface and the phosphor is provided on said convex surface.

30. The optical component according to claim 26 or claim 27, in which the optical component has a concave surface and the phosphor is provided on said concave surface.

31. The optical component according to claim 26 or claim 27, in which the optical component has a substantially hemispherical surface and the phosphor is provided on said hemispherical surface.

32. The optical component according to claim 31, in which the optical component comprises a substantially hemispherical shell and the phosphor is provided on the inner hemispherical surface.

33. The optical component according to claim 31, in which the optical component comprises a substantially hemispherical shell and the phosphor is provided on at least a part of the outer hemispherical surface.

34. The optical component according to claim 26 or claim 27, in which the optical component comprises a substantially spherical shell and the phosphor is provided on at least a part of the inner spherical surface.

35. The optical component according to claim 26 or claim 27, in which the optical component comprises a substantially spherical shell and the phosphor is provided on at least a part of the outer spherical surface.

36. The optical component according to claim 26 or claim 27, in which the optical component comprises a hollow cylinder and the phosphor is provided on at least a part of the inner surface.

37. The optical component according to claim 26 or claim 27 in which the optical component comprises a hollow cylinder and the phosphor is provided on at least a part of the outer surface.

38. The optical component according to claim 26 or 27, in which the phosphor comprises a powder which is incorporated within one of an epoxy resin, a silicone material and a polymer material to form a mixture and in which the phosphor mixture is applied to the optical component to form a layer of phosphor on the optical component surface.

39. The optical component according to claim 38, and further comprising a light diffusing material with the phosphor powder.

40. The optical component according to claim 26 or 27, in which the optical component is fabricated from one of a plastics material, a glass.

41. The optical component according to claim 26 or 27 in which the phosphor comprises a photoluminescent material having a formula A₂SiO₄:

Eu²⁺D where A is a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.

42. The optical component according to claim 26 or 27, in which the phosphor comprises a photoluminescent material having a formula (YA)₃(AlB)₅(OC)₁₂:

Ce³⁺ where A is a trivalent metal selected from the group consisting of Gd, Tb, La, Sm or divalent metal ions such as Sr, Ca, Ba, Mg, Zn and Cd;

B is selected from the group Si, B, P, and Ga; and

C is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.

43. The optical component according to claim 26 or 27, in which the phosphor comprises an orange-red silicate-based phosphor having a formula (SrM1)₃Si(OD)₅:

Eu where M1 is selected from the group consisting of Ba, Ca, Mg, and Zn, and D is selected from the group consisting of F, Cl, S, and N.

44. The lighting arrangement according to claim 26 or 27, in which the phosphor comprises a red silicon nitride based phosphor having a formula (SrM1)Si₅N₈ where M1 is selected from the group consisting of Sr, Ca, Mg, and Zn.

45. The lighting arrangement according to claim 26 or 27, in which the phosphor comprises a red sulfate based phosphor having a formula (SrM1)S where M1 is selected from the group consisting of Ca, Ba, and Mg.

46. The lighting arrangement according to claim 26 or 27, in which the phosphor comprises a green sulfate based phosphor having a formula (SrM1)(GaM2)₂S₄:

Eu where M1 is selected from the group consisting of Ca, Ba, and Mg, and M2 is selected from the group consisting of Al and In.

47. A method of fabricating a lighting arrangement comprising:

providing a radiation source configured to emit radiation having a first wavelength range and an optical component through which said radiation passes; and

providing on a surface of the optical component a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range.

48. The method according to claim 47, and comprising providing the phosphor as a substantially uniform thickness layer on said surface of the optical component.

49. The method according to claim 47 or claim 48, in which the optical component has a substantially planar surface and comprising providing the phosphor on said substantially planar surface.

50. The method according to claim 47 or claim 48, in which the optical component has a convex surface and comprising providing the phosphor on said convex surface.

51. The method according to claim 47 or claim 48, in which the optical component has a concave surface and comprising providing the phosphor on said concave surface.

52. The method according to claim 47 or claim 48, in which the optical component has a substantially hemispherical surface and comprising providing the phosphor on said hemispherical surface.

53. The method according to claim 52, in which the optical component comprises a substantially hemispherical shell and comprising providing the phosphor on the inner hemispherical surface.

54. The method according to claim 52, in which the optical component comprises a substantially hemispherical shell and comprising providing the phosphor on at least a part of the outer hemispherical surface.

55. The method according to claim 47 or claim 48, in which the optical component comprises a substantially spherical shell and comprising providing the phosphor on at least a part of the inner spherical surface.

56. The method according to claim 47 or claim 48, in which the optical component comprises a substantially spherical shell and comprising providing the phosphor on at least a part of the outer spherical surface.

57. The method according to claim 47 or claim 48, in which the optical component comprises a hollow cylinder and comprising providing the phosphor on at least a part of the inner surface.

58. The method according to claim 47 or claim 48, in which the optical component comprises a hollow cylinder and comprising providing the phosphor on at least a part of the outer surface.

59. The method according to claim 47 or 48 in which the optical component is fabricated from one of a plastics material, a glass.

60. A method of fabricating an optical component for a lighting arrangement of a type comprising a radiation source configured to emit radiation having a first wavelength range;

a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and

said optical component being configured such that at least said first wavelength range radiation passes through said optical component, the method comprising providing said phosphor on a surface of the optical component.

61. The method according to claim 60, and comprising providing the phosphor as a substantially uniform thickness layer.

62. The method according to claim 60 or claim 61, in which the optical component has a substantially planar surface and comprising providing the phosphor on said substantially planar surface.

63. The method according to claim 60 or claim 61, in which the optical component has a convex surface and comprising providing the phosphor on said convex surface.

64. The method according to claim 60 or claim 61, in which the optical component has a concave surface and comprising providing the phosphor on said concave surface.

65. The method according to claim 60 or claim 61, in which the optical component has a substantially hemispherical surface and comprising providing the phosphor on said hemispherical surface.

66. The method according to claim 65, in which the optical component comprises a substantially hemispherical shell and comprising providing the phosphor on the inner hemispherical surface.

67. The method according to claim 65, in which the optical component comprises a substantially hemispherical shell and comprising providing the phosphor on at least a part of the outer hemispherical surface.

68. The method according to claim 60 or 61, in which the optical component comprises a substantially spherical shell and comprising providing the phosphor on at least a part of the inner spherical surface.

69. The method according to claim 60 or 61, in which the optical component comprises a substantially spherical shell and comprising providing the phosphor on at least a part of the outer spherical surface.

70. The method according to claim 60 or 61, in which the optical component comprises a hollow cylinder and comprising providing the phosphor on at least a part of the inner surface.

71. The method according to claim 60 or 61, in which the optical component comprises a hollow cylinder and comprising providing the phosphor on at least a part of the outer surface.

72. The method according to claim 60 or 61, in which the phosphor comprises a powder and comprising incorporating the phosphor within one of a epoxy resin, silicone material, polymer material to form a mixture and applying the phosphor mixture to the optical component to form a layer of phosphor on the optical component surface.

73. The method according to claim 60, and further comprising incorporating a light diffusing material with the phosphor powder.

74. The method according to any one of claims 60, 61 or 73, in which the phosphor comprises a photoluminescent materials have a formula A₂SiO₄:

Eu²⁺D where A is a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn and Cd and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.

75. The lighting arrangement according to any one of claims 60, 61 or 73, in which the phosphor comprises a photoluminescent material having a formula (YA)₃(AlB)₅(OC)₁₂:

Ce³⁺ where A is a trivalent metal selected from the group consisting of Gd, Tb, La, Sm or divalent metal ions such as Sr, Ca, Ba, Mg, Zn and Cd;

B is selected from the group consisting of Si, B, P, and Ga; and

C is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N.

76. The lighting arrangement according to any one of claims 60, 61 or 73, in which the phosphor comprises an orange-red silicate-based phosphor having a formula (SrM1)₃Si(OD)₅:

Eu where M1 is selected from the group consisting of Ba, Ca, Mg, and Zn, and D is selected from the group consisting of F, Cl, S, and N.

77. The lighting arrangement according to any one of claims 60, 61 or 73, in which the phosphor comprises a red silicon nitride based phosphor having a formula (SrM1)Si₅N₈ where M1 is selected from the group consisting of Sr, Ca, Mg, and Zn.

78. The lighting arrangement according to any one of claims 60, 61 or 73, in which the phosphor comprises a red sulfate based phosphor having a formula (SrM1)S where M1 is selected from the group consisting of Ca, Ba, and Mg.

79. The lighting arrangement according to any one of claim 60, 61 or 73, in which the phosphor comprises a green sulfate based phosphor having a formula (SrM1)(GaM2)₂S₄:

Eu where M1 is selected from the group consisting of Ca, Ba, and Mg, and M2 is selected from the group consisting of Al, and In.

80. The method according to any one of claims 60, 61 or 73, and comprising fabricating the optical component from one of a plastics material, glass.

81. The method according to claim 60 and further comprising providing a plurality of optical components in the form of an array said array of optical components having a common planar surface and depositing said phosphor on the planar surface.

82. The method according to claim 81, and comprising providing the phosphor as a substantially uniform thickness layer on said planar surface of the array of optical components.

83. A phosphor material for coating an optical component of an LED lighting arrangement comprising a phosphor powder incorporated within one of an epoxy resin, a silicone material and a polymer material.

84. The phosphor material according to claim 83 and further comprising a light diffusing material.

85. An optical component for a lighting arrangement of a type comprising a radiation source configured to emit radiation having a first wavelength range;

a phosphor configured to absorb at least a portion of said first wavelength range radiation and emit radiation having a second wavelength range; and

said optical component being configured such that at least said first wavelength range radiation passes through said optical component, and characterized in that said phosphor is incorporated in said optical component.