Influence of heterojunction interface on exciplex emission from organic light-emitting diodes under electric fields |
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Authors: | Shengyi Yang Xiulong Zhang Zhidong Lou Yanbing Hou |
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Institution: | (1) Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P.R. China |
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Abstract: | In this paper, electroluminescence from organic light-emitting diodes based on 2-(4′-biphenyl)-5-(4′′-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine (TPD) is reported. Based on the exciplex emission from the TPD/PBD interface under high electric fields, the influence
of the TPD/PBD interface on exciplex emission was investigated by increasing the number of TPD/PBD interfaces while keeping
both the total thickness of the TPD layer and the PBD layer constant in the multiple quantum-wells (MQW) device ITO/TPD/PBD/TPD]n/PBD/Al (n is the well number that was varied from 0 to 3). Our experimental data shows that exciplex emission can be enhanced
by suitably increasing the well number of this kind of MQW-like device.
PACS 78.60.Fi; 78.55.Kz; 73.61.Ph |
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Keywords: | |
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