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High-efficiency blue light-emitting electrophosphorescent device with conjugated polymers as the host

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6 Author(s)
Zhang, Xiuju ; Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, China 510640, People’s Republic of China ; Jiang, Changyun ; Mo, Yueqi ; Xu, Yunhua
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Highly efficient blue polymer phosphorescent organic light-emitting diode (PPHOLED)-containing iridium(III) bis (2,4-difluorophenyl-2-pyridine) (2-(4H-1, 2, 4-triazol-3-yl)pyridine) [Ir(PPF)2(PZ)] complex embedded into wide-gap poly (9,9-alkyl-3, 6-silafluorene) (PSiFC6C6) has been fabricated. Despite the significant quenching of photophosphorescence emission of the iridium complexes by a PSiFC6C6 host polymer, organic light-emitting diodes containing Ir(PPF)2(PZ) doped into the polymer host PSiFC6C6 emit high-efficiency blue light peaked at 462 nm. The maximal external quantum and luminance efficiencies were, respectively, 4.8% photons/electrons and 7.2 cd/A at 644 cd/m2 and with Commission Internationale de l’Eclairage coordinates of (0.15,0.26).

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Applied Physics Letters  (Volume:88 ,  Issue: 5 )