Significant improvement of OLED efficiency and stability by doping both HTL and ETL with different dopant in heterojunction of polymer/small-molecules |
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| Authors: | Nie Hai Zhang Bo Tang Xian-Zhong |
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| Affiliation: | School of Microelectronics and Solid-State Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China; Chengdu University of Information Technology, Chengdu 610225, China |
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| Abstract: | This paper reports that the polymer/organic heterojunction dopedlight-emitting diodes using a novel poly-TPD as hole transportmaterial and doping both hole transport layer and emitter layer withthe highly fluorescent rubrene and DCJTB has been successfullyfabricated. The basic structure of the heterostructure isPTPD/Alq3. When hole transport layer and electron transport layerare doped simultaneously with different dopant, theelectroluminescence quantum efficiencies are about 3 times greaterthan that of the undoped device. Compared with undoped device andconventional TPD/Alq3 diode, the stability of the doping device issignificantly improved. The process of emission for doped device mayinclude carrier trapping as well as F"{o}rster energy transfer. |
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| Keywords: | heterojunction doping organic electroluminescence stability |
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