Invention Application
- Patent Title: Electroluminescence element
- Patent Title (中): 电致发光元件
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Application No.: US11238734Application Date: 2005-09-29
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Publication No.: US20060066231A1Publication Date: 2006-03-30
- Inventor: Ryuji Nishikawa , Nobuo Saito
- Applicant: Ryuji Nishikawa , Nobuo Saito
- Priority: JP2004-289358 20040930; JP2004-289364 20040930
- Main IPC: H01L51/50
- IPC: H01L51/50 ; H05B33/12

Abstract:
An EL element includes, between an anode and a cathode, an emissive element layer including a plurality of emissive layers. The emissive element layer includes two or more organic layers containing a hole transporting compound, and one or more of the plurality of emissive layers contain the hole transporting compound. The concentration of the hole transporting compound in the organic layer which is formed closest to the electron injecting electrode among the organic layers containing the hole transporting compound is lower than the concentration of the hole transporting compound in the organic layer which is formed closest to the hole injecting electrode. When three or more organic layers contain a hole transporting compound, the concentration of the hole transporting compound contained in each organic layer can be set such that, as the organic layer is further away from the hole injecting electrode, the concentration is lower. With this setting, the supply amount and supply timing of holes and electrons can be optimized easily with regard to each of the plurality of emissive layers, so that uniform light emission can be generated in any one of the emissive layers.
Information query
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