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Spectral Characteristics of White Organic Light-emitting Diodes Based on Novel Phosphorescent Sensitizer
Xiao-qing Tang,Jun-sheng Yu *,Lu Li,Wen Wen,Ya-dong Jiang
Author NameAffiliationE-mail
Xiao-qing Tang 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  
Jun-sheng Yu * 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 jsyu@uestc.edu.cn 
Lu Li 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  
Wen Wen 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  
Ya-dong Jiang 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  
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.
Key words:  White organic light-emitting diode, Phosphorescent sensitizer, Spectrum analysis
FundProject:
Spectral Characteristics of White Organic Light-emitting Diodes Based on Novel Phosphorescent Sensitizer
唐晓庆,于军胜*,李璐,文雯,蒋亚东
摘要:
采用新型贵金属铱的配合物bis(1,2-dipheny1-1H-benzoimida-zole)iridium (acetylacetonate)作为磷光敏化剂,与荧光染料4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-en-yl)-4H-pyran共同掺杂到聚合物主体材料poly(N-vinylcarbazole)中,以N,N'-diphenyl-N,N'-bis(1-naphthyl) (1,1'-biphenyl)-4,4'-diami-ne作为蓝光发光层,制备了白色有机电致发光器件. 通过对掺杂体系的紫外-可见吸收光谱、光致发光光谱以及电致发光光谱的表征,分析了该磷光敏化体系的能量转移机制. 结果表明,在该聚合物磷光荧光双掺杂体系中,由于磷光与荧光材料之间的不完全的F?rster能量传递过程,导致电致发光光谱中同时存在磷光材料三线态到基态与荧光材料单线态到基态的辐射衰减发光. 该掺杂体系成功实现了白光发射,随着偏置电压的升高,器件的CIE色坐标有微小的红移,但都非常接近等能白光点,器件表现出了很好的色纯度.
关键词:  白色有机电致发光器件,磷光敏化剂,光谱分析
DOI:10.1088/1674-0068/21/06/510-514
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