TITLE

Improvement in carrier transport and recombination of white phosphorescent organic light-emitting devices using a composite blue emitter

AUTHOR(S)
Meng-Ting Lee; Jin-Sheng Lin; Miao-Tsai Chu; Mei-Rurng Tseng
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p133306
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate high-efficiency white phosphorescent organic light-emitting devices (PHOLEDs) based on a yellow and composite blue emitters. The composite blue emitter is constructed from a wide-band-gap host, organometallic iridium dopant, and a carrier-transporting material. Under the same driving current density and emissive color, the current efficiency of the white PHOLEDs can be enhanced by a factor of 1.4 comparing to that of using typical blue emitter composed of host and dopant only. Attaching an outcoupling enhancement film onto glass substrate, the white PHOLEDs with a current efficiency of 47 cd/A, a power efficiency of 32 lm/W, and a CIEx,y (CIE: Commission Internationale d'Eclairage) of (0.40,0.44) at a practical brightness of 1000 cd/m2 can be achieved.
ACCESSION #
34771879

 

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