The effect of electric field strength on electroplex emission at the interface of NPB/PBD organic light-emitting diodes |
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| Authors: | De-Wei Zhao Fu-Jun Zhang Su-Ling Zhao Guang-Cai Yuan Hong-Hua Xu |
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| Institution: | a Key Laboratory of Luminescence and Optical Information, Ministry of Education Beijing, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China
b Faculty of Physics, Liaoning University, Shenyang 110036, China |
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| Abstract: | Organic light-emitting diode (OLED) based on two kinds of blue emission materials N,N′-bis(1-naphthyl)-N,N′-diphenyl-l,l′-diphenyl-4,4′-diamine (NPB) and 2-(4-biphenylyl)-5(4-tert-butyl-phenyl)-1,3,4-oxadiazole (PBD) was fabricated. There is only one emission peak in photoluminescence (PL) spectrum which originates from NPB exciton emission. And the electroluminescence (EL) emission peaks have an apparent red-shift with the increase of driving voltage. The red-shift emission from exciplex emission could be ruled out. Thus, by the method of Gaussian fitting it should be ascribed to the overlap of exciton emission and electroplex emission which occurs at the interface between NPB and PBD. The formation of the electroplex emission under high electric field is analyzed. |
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| Keywords: | Electroplex emission Exciton emission Red-shift |
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