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Chin. Phys. B, 2014, Vol. 23(4): 047202    DOI: 10.1088/1674-1056/23/4/047202
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Electric field-induced hole injection-enhanced photoluminescence in a N,N'-bis(3-methylphenyl)-N,N'-bis(phenyl)-benzidine-based emitter

Xu-Xie Hui-Na, Li Wen-Bin, Peng Huan, He Yun, Yu Hao-Miao, Hou Xiao-Yuan
Key Laboratory of Micro-and Nano-Photonic Structures (Ministry of Education) and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
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.
Keywords:  photoluminescence      doped structure      external electric field      energy level  
Received:  03 October 2013      Revised:  21 November 2013      Accepted manuscript online: 
PACS:  72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)  
  72.80.Le (Polymers; organic compounds (including organic semiconductors))  
  72.40.+w (Photoconduction and photovoltaic effects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11134002) and the National Science and Technology MajorProject of the Ministry of Science and Technology of China (Grant No. 2012CB921401).
Corresponding Authors:  Hou Xiao-Yuan     E-mail:  xyhou@fudan.edu.cn
About author:  72.20.Jv; 72.80.Le; 72.40.+w

Cite this article: 

Xu-Xie Hui-Na, Li Wen-Bin, Peng Huan, He Yun, Yu Hao-Miao, Hou Xiao-Yuan Electric field-induced hole injection-enhanced photoluminescence in a N,N'-bis(3-methylphenyl)-N,N'-bis(phenyl)-benzidine-based emitter 2014 Chin. Phys. B 23 047202

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