Organic electroluminescent cell

• US 4,356,429 A
• Filed: 07/17/1980
• Issued: 10/26/1982
• Est. Priority Date: 07/17/1980
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Tang, Ching W.
• Primary Examiner(s): Segal, Robert
• Application Number:
  US06/169,705
• Time in Patent Office: 831 Days
• Field of Search: 313/504, 313/503, 313/509, 313/506
• US Class Current: 313/503
• 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: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 85/311 Phthalocyanine
• CPC Class Codes: H10K 85/621 Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide

Abstract

An organic electroluminescent cell is disclosed comprising a luminescent zone between two electrodes, wherein a hole-injecting zone comprising a porphyrinic compound is disposed between the luminescent zone and the anode electrode.

Claims

1. In an electroluminescent cell including an anode electrode, a cathode electrode, and a luminescent zone between said electrodes comprising an organic luminescent agent and a binder having a breakdown field strength of at least about 10⁵ volt/cm,

the improvement comprising, between said luminescent zone and said anode electrode, a hole-injecting zone comprising a layer of a porphyrinic compound.

2. A cell as defined in claim 1, wherein said porphyrinic compound is a phthalocyanine.

3. A cell as defined in claim 1, wherein said porphyrinic compound is a metal phthalocyanine.

4. A cell as defined in claim 1, 2 or 3, wherein said binder is a polymeric solvent for said luminescent agent.

5. A cell as defined in claim 1, wherein said luminescent zone includes a second luminescent agent different from said organic luminescent agent, said second agent being capable of shifting the wavelength of the light emission from that of the first luminescent agent.