| Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density |
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| 作者姓名： | 魏斌 廖英杰 刘纪忠 路林 曹进 王军 张建华 |
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| 作者单位： | Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China;Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China |
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| 基金项目： | Project supported by the Key
Project of Shanghai Education Committee (Grant No.~08ZZ42), and
Science and Technology Commission of Shanghai Municipal (Grant
Nos.~08PJ14053, 08DZ1140702 and 08520511200). |
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| 摘 要： | This paper utilizes multilayer organic light-emitting diodes with a thin layer of dye molecules to study the mechanism of charge trapping under different electric regimes.It demonstrates that the carrier trapping was independent of the current density in devices using fluorescent material as the emitting molecule while this process was exactly opposite when phosphorescent material was used.The triplet-triplet annihilation and dissociation of excitons into free charge carriers was considered to contribute to the decrease in phosphorescent emission under high electric fields.Moreover,the fluorescent dye molecule with a lower energy gap and ionized potential than the host emitter was observed to facilitate the carrier trapping mechanism,and it would produce photon emission.
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| 关 键 词： | organic light-emitting diodes excitation mechanism charge trapping current density |
| 收稿时间： | 2009-06-14 |
Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density |
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| Wei Bin,Liao Ying-Jie,Liu Ji-Zhong,LuLin,Cao Jin,Wang Jun and Zhang Jian-Hua.Dependence of charge trapping of fluorescent and phosphorescent dopants in organic light-emitting diodes on the dye species and current density[J].Chinese Physics B,2010,19(3):37105-037105. |
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| Authors: | Wei Bin Liao Ying-Jie Liu Ji-Zhong LuLin Cao Jin Wang Jun and Zhang Jian-Hua |
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| Institution: | Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China |
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| Abstract: | This paper utilizes multilayer organic light-emitting
diodes with a thin layer of dye molecules to study the mechanism of
charge trapping under different electric regimes. It demonstrates
that the carrier trapping was independent of the current density in
devices using fluorescent material as the emitting molecule while this
process was exactly opposite when phosphorescent material was used.
The triplet--triplet annihilation and dissociation of excitons into
free charge carriers was considered to contribute to the decrease in
phosphorescent emission under high electric fields. Moreover, the
fluorescent dye molecule with a lower energy gap and ionized
potential than the host emitter was observed to facilitate the
carrier trapping mechanism, and it would produce photon emission. |
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| Keywords: | organic light-emitting diodes excitation mechanism charge trapping current density |
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