TITLE

Low roll-off efficiency green phosphorescent organic light-emitting devices with simple double emissive layer structure

AUTHOR(S)
Woo Sik jeon; Tae Jin Park; Sun Young Kim; Pode, Ramchandra; Jin Jang; Jang Hyuk Kwon
PUB. DATE
August 2008
SOURCE
Applied Physics Letters;8/11/2008, Vol. 93 Issue 6, p063303
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using an Ir(ppy)3 metal complex doped in 4,4′4″-tris(N-carbazolyl)-triphenylamine hole and bis[2-(2-hydroxyphenyl)-pyridine]beryllium electron transport host materials, simple three layer green phosphorescent organic light-emitting devices comprising double emissive layers have been fabricated. A low driving voltage value of 3.3 V to reach a luminance of 1000 cd/m2 and maximum current- and power-efficiency values of 58.7 cd/A and 65.1 lm/W, and maximum external quantum efficiency (EQE) value of 18.6% are reported in this device. EQE exceeding 15% over a wide range of current density from 0.03 to 25 mA/cm2 is noticed. We demonstrate a low roll-off current efficiency value of 12% at a luminance of 10 000 cd/m2 in a highly efficient simple double emissive layer device, imperative to high brightness applications.
ACCESSION #
34000040

 

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