Charge tunneling and cross recombination at organic heterojunction under electric fields |
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Authors: | S Y Yang X L Zhang Z D Lou Y B 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: | Electroluminescence (EL) of bilayer organic light-emitting diodes based on N,N'-diphenyl-N,N'-bis(3-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine
(TPD) and 2-(4'-biphenyl)-5-(4”-tert-butylphenyl)-1,3,4-oxadiazole (PBD) were reported. The EL spectra of bilayer device ITO/TPD/PBD/Al consist of monomolecular
emission from TPD, exciplex emission and charge carriers cross recombination at the TPD/PBD interface. By varying the thickness
of each organic layer while keeping the thickness of the whole device constant, three kinds of bilayer devices were fabricated
and their EL and photoluminescence spectra were compared with each other, and our experimental data show that charge tunneling
and cross recombination coexist at the TPD/PBD interface, and these two processes compete with each other under high electric
fields. |
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Keywords: | 73 20 -r Electron states at surfaces and interfaces 73 40 -c Electronic transport in interface structures 74 78 Fk Multilayers superlattices heterostructures 77 84 Jd Polymers organic compounds |
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