| Electric field-induced hole injection-enhanced photoluminescence in a N,N’-bis(3-methylphenyl)-N,N’-bis(phenyl)-benzidine-based emitter |
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| 引用本文： | 许谢慧娜,李文彬,彭欢,何鋆,于浩淼,侯晓远.Electric field-induced hole injection-enhanced photoluminescence in a N,N’-bis(3-methylphenyl)-N,N’-bis(phenyl)-benzidine-based emitter[J].中国物理 B,2014(4):521-526. |
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| 作者姓名： | 许谢慧娜 李文彬 彭欢 何鋆 于浩淼 侯晓远 |
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| 作者单位： | Key Laboratory of Micro- and Nano-Photonic Structures （Ministry of Education） and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China(Grant No.11134002);the National Science and Technology Major Project of the Ministry of Science and Technology of China(Grant No.2012CB921401) |
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| 摘 要： | Non-monotonic, asymmetrical electric field dependence of photoluminescence （PL） intensity is observed in a mono- layer sample of tris-（8-hydroxyquinoline） aluminum （A1Q） doped N,N＇-bis（3-methylphenyl）-N,N＇-bis（phenyl）-benzidine （TPD）. A possible model is proposed： the charge separation from the dissociated photoexcited excitons causes energy band bending in the organic films and improves the hole injection from the electrode, which brings about the extra fluorescence. This mechanism is further verified by a series of experiments using a series of samples, variously featuring symmetrical electrodes, block layers, and hosts with lower hole mobilities.
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| 关 键 词： | 甲基苯基 光致发光 空穴注入 联苯胺 电场诱导 非对称电场 基极 电荷分离 |
Electric field-induced hole injection-enhanced photoluminescence in a N,N'-bis(3-methylphenyl)-N,N'-bis(phenyl)-benzidine-based emitter |
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| Abstract: | Non-monotonic, asymmetrical electric field dependence of photoluminescence(PL) intensity is observed in a monolayer sample of tris-(8-hydroxyquinoline) aluminum(AlQ) doped N,N'-bis(3-methylphenyl)-N,N'-bis(phenyl)-benzidine(TPD). A possible model is proposed: the charge separation from the dissociated photoexcited excitons causes energy band bending in the organic films and improves the hole injection from the electrode, which brings about the extra fluorescence.This mechanism is further verified by a series of experiments using a series of samples, variously featuring symmetrical electrodes, block layers, and hosts with lower hole mobilities. |
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| Keywords: | photoluminescence doped structure external electric field energy level |
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