Color electroluminescent displays

• US 20060055316A1
• Filed: 11/08/2005
• Published: 03/16/2006
• Est. Priority Date: 10/18/2002
• Status: Active Grant

• Current Assignee: iFire IP Corporation
• Original Assignee: iFire Technology Inc.
• Inventors: Nakua, Abdul M., Wu, Xingwei
• Granted Patent: US 7,579,769 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 11/7707 Germanates
• CPC Class Codes: C09K 11/7712 Borates
• CPC Class Codes: C09K 11/7731 with alkaline earth metals
• CPC Class Codes: C09K 11/7734 Aluminates
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

The present invention is directed to color electroluminescent displays comprising a novel sub-pixel structure and method for making the same. The sub-pixel structure has an electroluminescent phosphor, which emits blue light, and a photoluminescent phosphor, which emits at least one other color as a result of absorption of the blue light. The invention is also directed to novel photoluminescent phosphor materials.

Claims

1-53. -53. (canceled)

54. A photoluminescent phosphor material for emissive displays, said material comprising:

a pigment powder comprising a solid solution of organic photoluminescent molecules; and

a matrix material, wherein said pigment powder is dispersed in said matrix material, said matrix material being chemically and physically compatible with said pigment powder such that the photoluminescent efficiency of the organic photoluminescent molecules are substantially maintained.

55. A photoluminescent phosphor material according to claim 54, wherein said pigment powder is selected from the group consisting of a green pigment Radiant™

MC-CH5860, a green pigment Radiant™

MP-CH5510, a blue pigment Radiant™

MP-BL5529, a red pigment Radiant™

MC-RD5515, a red pigment Radiant™

MC-OR5864, and a yellow pigment Radiant™

MC-OY5862, and mixtures thereof.

56. A photoluminescent phosphor material according to claim 54, wherein said matrix material is selected from the group consisting of an epoxy, polymethylmethacrylate (PMMA) and polymethylglutaridimide.

57. A photoluminescent phosphor material according to claim 56, wherein said matrix material is UV-imagable resin Luxul™

-1010 (80-B).

58. A photoluminescent phosphor material according to claim 54, wherein said matrix material is a photoresist material.

60. A method for making said photoluminescent phosphor material according to claim 54, said method comprising mixing said pigment powder and said matrix material to provide a uniform dispersion of said pigment powder in said matrix material.

61. A method according to claim 60, wherein the uniform dispersion may be printed or spread on a substrate to form a photoluminescent phosphor layer.

62. A photoluminescent phosphor material according to claim 54 in an emissive display.

63. A photoluminescent phosphor material according to claim 62, wherein said emissive display is selected from the group consisting of a thick film electroluminescent display, an organic light emitting diode display, a liquid crystal display and a plasma display.