发明授权
- 专利标题: High efficiency transparent organic light emitting devices
- 专利标题(中): 高效透明有机发光装置
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申请号: US10696286申请日: 2003-10-28
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公开(公告)号: US06885149B2公开(公告)日: 2005-04-26
- 发明人: Gautam Parthasarathy , Chihaya Adachi , Paul E. Burrows , Stephen R. Forrest
- 申请人: Gautam Parthasarathy , Chihaya Adachi , Paul E. Burrows , Stephen R. Forrest
- 申请人地址: US NJ Princeton
- 专利权人: The Trustees of Princeton University
- 当前专利权人: The Trustees of Princeton University
- 当前专利权人地址: US NJ Princeton
- 代理机构: Kenyon & Kenyon
- 主分类号: A61B17/00
- IPC分类号: A61B17/00 ; A61B17/22 ; A61B18/00 ; A61F2/958 ; A61F7/00 ; A61F7/12 ; A61M25/00 ; H01L51/00 ; H01L51/30 ; H01L51/50 ; H01L51/52 ; H05B33/10 ; H05B33/28 ; H05B33/00 ; H05B33/14 ; H05B33/26
摘要:
A highly transparent non-metallic cathode is disclosed that comprises a metal-doped organic electron injection layer that is in direct contact with a transparent non-metallic electron injecting cathode layer, such as indium tin oxide (ITO), wherein the metal-doped organic electron injection layer also functions as an exciton blocking or hole blocking layer. The metal-doped organic electron injection layer is created by diffusing an ultra-thin layer of about 5-10 Å of a highly electropositive metal such as Li throughout the layer. A representative embodiment of the highly transparent non-metallic cathode comprises a layer of ITO, a layer of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), which acts as an electron injection, exciton blocking, and hole blocking layer, and an ultra-thin layer of lithium, which degenerately dopes the layer of BCP, improving the electron injecting properties of the BCP layer. This cathode is demonstrated for use in an OLED having a transparency of about 90% or higher combined with a device external quantum efficiency of about 1% or higher.