期刊
APPLIED PHYSICS LETTERS
卷 94, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3075066
关键词
conducting polymers; electron traps; hole traps; organic light emitting diodes; organic semiconductors; phosphorescence
资金
- National Science Council [NSC96-2112-M-009-011]
- Ministry of Education ATU
This paper describes the effects of charge trapping on the device performances of triplet polymer light-emitting diodes (PLEDs) after the cathode contact had been improved through the blending of poly(ethylene glycol) (PEG) into the active layer. The external quantum efficiency (EQE) was enhanced when the dopant tended to trap electrons. In contrast, we observed no EQE enhancement for the device featuring a hole-trapping dopant. Because PEG promoted electron injection, more electrons were trapped in the triplet molecules, thereby enhancing the probability of recombination. Finally, after incorporating PEG, we further achieved white PLEDs exhibiting both high EQE and high power efficiency.
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