Charge carrier injection and transport in polymer blend films |
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Authors: | Shan Yu Quan Feng Teng DeAng Liu YongSheng Wang |
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Affiliation: | a Institute of Optoelectronics, Northern Jiaotong University, Beijing 100044, People's Republic of China b ShenYang University of Technology, ShenYang 130021, People's Republic of China c Institute of Material Physics, Tianjin Institute of Physics, Tianjin 300191, People's Republic of China |
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Abstract: | The steady current-voltage characteristics of single layer organic devices based on MEH-PPV and N,N′-diphenyl-N,N′-bis(4′-[N,N-bis(naphth-1-yl)-amino]-biphenyl-4-yl)-benzidine (TPTE) blend with different TPTE concentrations was investigated. The thickness dependence of the current-voltage relationship clearly demonstrates that the current at low voltage and at high voltage are all space charge limited. The current density-electric field characteristic proves the blend polymer LEDs to operate in the tunneling-controlled model. The effective hole mobility is directly determined by space charge limited current at high voltage and increases with increasing TPTE content in the blend. The EL efficiency shows concentration dependence, which is attributed to the change of the transport of holes in the blend film. |
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Keywords: | 78.66.Qn 85.60.Jb |
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