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P‐141: High‐Efficiency and Long Lifetime Electrophosphorescent Organic Light‐Emitting Diodes with Improved Hole‐Electron Balance by using Alternate Multilayer Structures
Author(s) -
Wei Peng,
Zhang Deqiang,
Gao Yudi,
Wang Liduo,
Qiu Yong
Publication year - 2005
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.2036577
Subject(s) - iridium , rubrene , oled , materials science , diode , phosphorescence , biphenyl , optoelectronics , doping , layer (electronics) , electron , chemistry , optics , fluorescence , physics , catalysis , nanotechnology , organic chemistry , quantum mechanics
Electrophosphorescent organic light‐emitting diodes (PHOLEDs) with alternate multilayer structures, which consist of N, N′‐bis‐(1‐naphthyl)‐N, N′‐diphenyl‐1,1′‐biphenyl‐4,4′‐diamine (NPB) and 5,6,11,12‐tetraphenylnaphthacene (rubrene) as hole‐transporting layers have been fabricated. The effect of the alternate multilayer structures upon ther performance of PHOLEDs with fac‐tris(2‐phenylpyridine)iridium (Ir(ppy) 3 ) doped into 4,4′‐N, N′‐dicarbazole‐biphenyl (CBP) as the emitting layer has been investigated. Compared with the conventional diode only with NPB as hole‐transporting layer, high efficiency and long lifetime diodes have been obtained with the alternate structures. Such an improvement in the device performance was attributed to the improved hole‐electron balance, which can be further attributed to the introduction of the alternate multilayer structure into PHOLEDs.