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

doi:10.1088/1674-1056/23/4/047202

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 (许谢慧娜), Li Wen-Bin (李文彬), Peng Huan (彭欢), He Yun (何鋆), Yu Hao-Miao (于浩淼), Hou Xiao-Yuan (侯晓远) 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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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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