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Organic light emitting device structures for obtaining chromaticity stability

Patent ·
OSTI ID:1175332
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The present invention relates to organic light emitting devices (OLEDs). The devices of the present invention are efficient white or multicolored phosphorescent OLEDs which have a high color stability over a wide range of luminances. The devices of the present invention comprise an emissive region having at least two emissive layers, with each emissive layer comprising a different host and emissive dopant, wherein at least one of the emissive dopants emits by phosphorescence.

Research Organization:
Universal Display Corporation, Ewing, NJ (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-02ER83565
Assignee:
Universal Display Corporation (Ewing, NJ)
Patent Number(s):
6,885,025
Application Number:
10/618,160
OSTI ID:
1175332
Country of Publication:
United States
Language:
English

References (4)

Highly efficient phosphorescent emission from organic electroluminescent devices journal September 1998
High-efficiency electrophosphorescent organic light-emitting diodes with double light-emitting layers journal November 2002
Very high-efficiency green organic light-emitting devices based on electrophosphorescence journal July 1999
Nearly 100% internal phosphorescence efficiency in an organic light-emitting device journal November 2001

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