Red light-emitting hyperbranched fluorene-alt-carbazolecopolymers with an iridium complex as the core

文献情報

出版日 2011-07-08

DOI 10.1039/C1PY00075F

インパクトファクター 5.582

著者

Ting Guo, Rong Guan, Jianhua Zou, Jie Liu, Lei Ying, Wei Yang, Hongbin Wu, Yong Cao

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要旨

Red light-emitting hyperbranched copolymers with an iridium complex as the core and fluorene-alt-carbazole as the branches were synthesized by one-pot Suzuki polycondensation. Efficient energy transfer from the poly(3,6-carbazole-alt-2,7-fluorene) segment to the iridium complex occurs when the Ir complex content is as low as 1 mol% in the copolymer. A maximal external quantum efficiency of 6.1% ph/el and a luminous efficiency of 4.7 cd A−1 were obtained with a CIE coordinate of (0.63, 0.32) for the device made from PFCzPh20NapyIr2 copolymer. The efficiency loss upon the increase of current density is significantly reduced since the highly branched structure could suppress the interchain interaction of polymers and the self quenching of the Ir complex. The integration of a phosphorescent complex into hyperbranched polymers can provide a successful molecular design route for solution-processable polymers for PLED applications.

掲載誌

Polymer Chemistry

CiteScore: 8.6

自己引用率: 7.3%

年間論文数: 457

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Red light-emitting hyperbranched fluorene-alt-carbazolecopolymers with an iridium complex as the core

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