新型以咔唑为主链的能量转移型发光聚合物  

Novel Energy Transfer Carbazole-based Light-emitting Copolymers

作　　者：黄剑[1] 牛于华[1] 杨伟[1] 侯琼[1] 许怡赦[1] 袁敏[1] 曹镛[1] 

机构地区：[1]华南理工大学高分子光电材料与器件研究所,广州510640

出　　处：《化学学报》2003年第5期765-773,共9页Acta Chimica Sinica

基　　金：国家自然科学基金 (No .2 9992 530 6);国家重点基础研究发展规划 (No .2 0 0 2CB61 340 2 )

摘　　要：用Suzuki偶合反应合成了一系列以咔唑为主链 ,与不同的芳香环和杂环化合物共聚的新型电致发光无规共聚物 .这些共聚物溶于普通的有机溶剂 ,发较强的荧光 .咔唑链段为共聚物提供了很好的空穴传输和空穴注入性能 .与咔唑共聚的窄能隙单体 ,如蒽 (ANT)、噻吩 (Th)、2 ,1,3 苯并噻二唑 (BTDZ)、2 ,1,3 苯并硒二唑 (BseDZ)和 4,7 二噻吩 2 ,1,3 苯并噻二唑 (DBT)在聚合物中含量小于 5 0 %时成为陷阱中心 .还观察到极为有效的分子内能量转移 .由于共聚单体的能隙不同 ,这些电致发光共聚物的发光范围可覆盖整个可见光谱区 .研究结果表明 ,用咔唑作为宽带主体 ,与少量低带隙单体共聚 ,有可能成为一种合成同时兼有优异空穴注入特性 ,又能广泛调节发光颜色的新的发光聚合物体系 .A series of novel electroluminescent polycarbazole-based main chain copolymers with varieties of aromatic rings and heterocycles as comonomer has been synthesized by Suzuki coupling reaction. The copolymers are soluble in common. organic solvents and are highly fluorescent. Conjugated carbazole segment provides good hole-injection and hole-transport properties. Narrow band-gap heterocycles and aromatic rings, such as benzothiadiazole, benzoselenadiazole, 4,7-dithien-2-yl-2,1,3-benzothiadiazole, thiophenes and anthracene in less than 50% of molar ratio in the copolymer were incorporated as a trapping center. The efficient, energy transfer due to exciton trapping on the narrow band-gap sites was observed. The emission color can be tuned in entire visible region, by carefully selecting the narrow band-gap comonomers. The use of conjugated polycarbazole as wide band-gap segment could provide a new way to combine good hole-injection properties along with color tuning ability.

关 键 词：能量转移型发光聚合物 咔唑 主链 Suzuki偶合反应 芳香环 杂环化合物 共聚 电致发光 有机/聚合物电致发光器件 

分 类 号：O633[理学—高分子化学]