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Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (9): 847-852. Previous Articles     Next Articles

Original Articles

新型基于3,6-咔唑与噻吩衍生物的红光聚合物的合成与性能研究

刘然升1, 曾文进1, 杜斌1, 候琼2, 石伟1, 孙明亮1, 杨伟1, 曹镛*,1   

  1. (1华南理工大学高分子光电材料与器件研究所 特种材料重点实验室 广州 510640)
    (2华南师范大学化学与环境学院 广州 510640)
  • 投稿日期:2006-12-11 修回日期:2007-01-22 发布日期:2007-05-14
  • 通讯作者: 曹镛

Synthesis and Characterization of Novel Red-light-emitting Polymers Based on 3,6-Carbazole and Thiophene Derivatives

LIU Ran-Sheng1; ZENG Wen-Jin1; DU Bin1; HOU Qiong2; SHI Wei1; SUN Ming-Liang1; YANG Wei1; CAO Yong*,1   

  1. (1 Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640)
    (2 School of Chemistry and Environment, South China Normal University, Guangzhou 510640)
  • Received:2006-12-11 Revised:2007-01-22 Published:2007-05-14

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A series of conjugated copolymers derived from N-(2-ethylhexyl)-3,6-carbazole (Cz) and 4,7-di(4-hexylthien-2-yl)-2,1,3-benzothiadiazole (DHTBT) were synthesized by Suzuki polycondensation. The electrochemical, optical and electroluminescent properties of these polymers were investigated. Efficient energy transfer from the Cz segment to the DHTBT unit occurred even if the DHTBT content in the copolymers was as low as 1 mol% in solid film. PL emission was red-shifted significantly from 645 to 690 nm with the increase in DHTBT content from 1 to 50 mol%. The highest PL efficiency in solid film was 71% for PCzDHTBT1. EL emission of devices with these polymers as active layer red-shifted from 635 to 680 nm when the DHTBT content increased from 1 mol% to 50 mol%. The highest external quantum efficiency was 0.61% for devices from PCzDHTBT15 with the device configuration of ITO/PEDOT: PSS/polymer/Ba/Al.

Key words: carbazole, thiophene derivative, red electroluminescence, polymer light-emitting diodes (PLEDs)