High brightness inorganic electroluminescence device driven by direct current

• US 8,258,690 B2
• Filed: 10/11/2005
• Issued: 09/04/2012
• Est. Priority Date: 10/11/2005
• Status: Expired due to Fees

• Current Assignee: Kuraray Company Limited
• Original Assignee: Kuraray Company Limited
• Inventors: Ueda, Tadashi, Yamauchi, Seikoh, Kanamori, Jiro, Hayashi, Yoshisada
• Primary Examiner(s): Hines, Anne
• Assistant Examiner(s): DIAZ, JOSE
• Application Number:
  US11/246,200
• Publication Number:
  US 20070080631A1
• Time in Patent Office: 2,520 Days
• Field of Search: 313498-512, 428/917, 428/690, 2523014 R-3016 P, 252/301.16
• US Class Current: 313/503
• CPC Class Codes: C09K 11/7428 Halogenides C09K11/7407 takes precedence
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material

Abstract

The present invention is characterized by a DC-driven inorganic EL element useful for mobile and other applications, the EL element including at least plural electrode layers, and a light emitter layer made of an inorganic composition, which is provided between the electrode layers, wherein the attainted brightness in the DC drive is 10000 cd/m² or more.

Claims

1. An inorganic EL element comprising at least two electrode layers to which a DC drive is connected, and a light emitter layer made of an inorganic composition that comprises iridium, which is provided between the electrode layers, wherein an attained brightness in the DC drive is 10000 cd/m2 or more, wherein the inorganic composition is obtained through an explosion method.

2. The inorganic EL element according to claim 1, wherein the thickness of said EL light emitter layer is 0.05 μ

m or more and 100 μ

m or less.

3. The inorganic EL element according to claim 1 or claim 2, wherein said EL light emitter layer has surfaces between said two layers of electrodes, the two surfaces being made of different compositions.

4. The inorganic EL element according to claim 1, wherein at least one electrode comprises silicon single crystal.

5. The inorganic EL element according to claim 4, wherein at least one other electrode comprises silver.

6. The inorganic EL element according to claim 1, wherein an attained brightness in the DC drive is at least 375000 cd/m2.

7. The inorganic EL element according to claim 1, wherein said inorganic composition comprises zinc sulfide.

8. The inorganic EL element according to claim 1, wherein the inorganic composition further comprises zinc sulfide, magnesium sulfide, zinc oxide, barium fluoride, magnesium chloride, iridium chloride and gallium arsenide.