Invention Grant
- Patent Title: Organic electroluminescent element and device
- Patent Title (中): 有机电致发光元件及器件
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Application No.: US11896434Application Date: 2007-08-31
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Publication No.: US07906897B2Publication Date: 2011-03-15
- Inventor: Tasuku Satou
- Applicant: Tasuku Satou
- Applicant Address: JP Tokyo
- Assignee: Fujifilm Corporation
- Current Assignee: Fujifilm Corporation
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2006-242080 20060906; JP2006-242081 20060906; JP2007-131640 20070517
- Main IPC: H01J33/04
- IPC: H01J33/04

Abstract:
An organic electroluminescent (EL) element includes at least a positive hole transport layer, a light emitting layer and an electron transport layer between at least a pair of electrodes, wherein the light emitting layer contains therein at least two light emitting materials having different Ea values or Ip values and emitting phosphorescence having the same color as each other, and among the two light emitting materials, a light emitting material having a larger Ea value or Ip value is contained at a higher density in a region of the light emitting layer in the vicinity of the positive hole transport layer, while a light emitting material having a smaller Ea value or Ip value is contained at a higher density in a region of the light emitting layer in the vicinity of the electron transport layer.
Public/Granted literature
- US20080054799A1 Organic electroluminescent element and device Public/Granted day:2008-03-06
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