標題: Single-layer triplet white polymer light-emitting diodes incorporating polymer oxides: Effect of charge trapping at phosphorescent dopants
作者: Chen, Fang-Chung
Chien, Shang-Chieh
Chen, Yung-Shiuan
光電工程學系
顯示科技研究所
Department of Photonics
Institute of Display
關鍵字: conducting polymers;electron traps;hole traps;organic light emitting diodes;organic semiconductors;phosphorescence
公開日期: 26-Jan-2009
摘要: 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.
URI: http://dx.doi.org/10.1063/1.3075066
http://hdl.handle.net/11536/7724
ISSN: 0003-6951
DOI: 10.1063/1.3075066
期刊: APPLIED PHYSICS LETTERS
Volume: 94
Issue: 4
結束頁: 
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