Spectral Characteristics of White Organic Light-emitting Diodes Based on Novel Phosphorescent Sensitizer |
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| Authors: | Xiao-qing Tang Jun-sheng Yu Lu Li Wen Wen and Ya-dong Jiang |
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| Institution: | State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-
mation, University of Electronic Science and Technology of China, Chengdu 610054, China;State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-
mation, University of Electronic Science and Technology of China, Chengdu 610054, China;State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-
mation, University of Electronic Science and Technology of China, Chengdu 610054, China;State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-
mation, University of Electronic Science and Technology of China, Chengdu 610054, China;State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-
mation, University of Electronic Science and Technology of China, Chengdu 610054, China |
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| Abstract: | White organic light-emitting diodes were fabricated by using a novel phosphorescence bis(1,2-dipheny1-1H-benzoimidazole)iridium(acetylacetonate)(pbi)2Ir(acac)] as sensitizer and a fluorescent dye of 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran(DCJTB) codoped into a car-bazole polymer of poly(N-vinylcarbazole) (PVK). Through characterizing the UV-Vis absorption spectra,the photoluminescence spectra of (pbi)2Ir(acac) and DCJTB, and the electroluminescence spectral properties of the WOLEDs, the energy transfer mechanisms of the codoped polymer system were deduced. The results demonstrate that the luminescent spectra with different intensity of (pbi)2Ir(acac) and DCJTB were co-existent in the EL spectra of the blended system, which is ascribed to an incomplete energy transfer process in the EL process. The effcient F?rster and Dexter energy transfer between the host and the guests. |
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| Keywords: | White organic light-emitting diode Phosphorescent sensitizer Spectrum analysis |
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