Organic electroluminescent element and device

Details Organic electroluminescent element and device Organic electroluminescent element and device

2011-03-15

2011-03-15

Hines, Anne M (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S506000

Reexamination Certificate

active

07906897

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.

REFERENCES:
patent: 5281489 (1994-01-01), Mori et al.
patent: 6869695 (2005-03-01), Thompson et al.
patent: 2004-522276 (2004-07-01), None
patent: 2005-38763 (2005-02-01), None
patent: 2005038763 (2005-02-01), None

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