AC powder electroluminescence device and method for making the same

• US 5,912,533 A
• Filed: 05/22/1997
• Issued: 06/15/1999
• Est. Priority Date: 05/22/1996
• Status: Expired due to Fees

• Current Assignee: Ju Hyeon Lee, Sung Park, Vladimir Vlaskin
• Original Assignee: Ju Hyeon Lee, Sung Park, Vladimir Vlaskin
• Inventors: Lee, Ju Hyeon, Park, In Shik, Park, Sang Gook, Jung, Il Chae, Park, Sung, Vlaskin, Vladimir
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US08/861,540
• Time in Patent Office: 754 Days
• Field of Search: 313/503, 313/505, 313/506, 313/512, 313/509, 428/690, 428/917, 315/169.3
• US Class Current: 313/503
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• 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: H05B 33/20 characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H05B 33/24 of metallic reflective layers H05B33/26 takes precedence
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H05B 33/28 of translucent electrodes

Abstract

The invention relates to an easily fabricated and highly luminous electroluminescence (EL) device, whose front transparent electrode is made by using transparent conductive powder and transparent conductive binder, and a method for making such an EL device. The method comprises the steps of: providing a substrate; forming a metal electrode layer on the substrate, wherein the metal electrode layer reflects light incident thereto; forming a dielectric layer comprising a mixture of dielectric powder and a binder on the metal electrode layer; forming a phosphor layer including phosphor powder and a binder on the dielectric layer; and forming a transparent electrode layer including transparent conductive powder and a transparent conductive binder on the phosphor layer using a spin coating or a screen printing process employed for liquid material.

Claims

1. An illuminating device comprising:

a substrate;

a reflective metal electrode layer formed on the substrate;

a dielectric layer formed on the reflective metal electrode;

a phosphor layer formed on the dielectric layer; and

a transparent electrode layer comprising a mixture of transparent conductive powder and a transparent conductive binder formed on the phosphor layer.

2. The illuminating device as claimed in claim 1, wherein said substrate comprises a plastic thin film.

3. The illuminating device as claimed in claim 1, wherein said metal electrode layer comprises silver.

4. The illuminating device as claimed in claim 1, wherein said metal electrode layer comprises aluminum.

5. The illuminating device as claimed in claim 1, wherein the dielectric layer comprises a mixture of dielectric powder and a first binder.

6. The illuminating device as claimed in claim 5, wherein said dielectric powder contains BaTiO₃.

7. The illuminating device as claimed in claim 1, wherein said phosphor layer comprises a mixture of phosphor powder and a second binder.

8. The illuminating device as claimed in claim 7, wherein said phosphor powder contains a II-VI group compound.

9. The illuminating device as claimed in claim 7, wherein said phosphor powder contains a multiplicity of particles each of which is coated with a conductive outer coating.

10. The illuminating device as claimed in claim 9, wherein said conductive outer coating is made of liquid InGa.

11. The illuminating device as claimed in claim 1, wherein said transparent conductive powder contains indium tin oxide.

12. The illuminating device as claimed in claim 1, wherein said transparent conductive binder contains liquid InGa.