摘要
将缺电子单元—S,S-二氧-二苯并噻吩(SO)以2,8位引入到聚螺芴(PSFs)的主链,通过Suzuki聚合得到一系列具有不同SO含量的共聚物PSF-28SO-3、PSF-28SO-5、PSF-28SO-7和PSF-28SO-10。不同于3,7位连接,该系列2,8-位连接的共聚物既有来自于高分子主链的本征态(LE:local excited)发光,又有来自于从四烷氧基芴侧链到主链中SO单元的电荷转移(CT:charge transfer)发光,最终表现为近白光发射。其中,PSF-28SO-10具有最优器件性能,发光效率为0.58 cd/A,色坐标为(0.25,0.36)。
An electron-deficient moiety, namely dibenzothiophene-S, S-dioxide （ SO）, has been incorporated into the main chain of poly（spirobifluorene） s（PSFs） via its 2 and 8 positions to form a series of copolymers with different SO content （PSF-28SO-3, PSF-28SO-5, PSF-28SO-7 and PSF-28SO-10）. Unlike the 3,7- 1inked analogue that mainly reveals a charge transfer（CT） emission from the electron-rich tetraoctyloxyfluorene side chain to the electron-deficient SO unit in the main chain, the resultant polymers PSF-28SO-3 - PSF- 28SO-10 show emissions not only from the local excited （LE） states but also from the CT ones due to the unique 2,8-linkage. Consequently, near-white emission is achieved for these copolymers. Among them, PSF- 28SO-10 has the best device performance, giving a luminous efficiency of 0.58 cd/A and Commission Internationale de L＇Eelairage（CIE） coordinates of （0.25,0. 36）.
出处
《应用化学》
CAS
CSCD
北大核心
2014年第10期1156-1163,共8页
Chinese Journal of Applied Chemistry
基金
国家重点基础研究发展计划(973计划)(2009CB623601)
国家自然科学基金资助项目(21174144
51322308
91333205)~~
关键词
高分子发光二极管
电荷转移
聚螺芴
S
S-二氧-二苯并噻吩
polymer light-emitting diodes, charge transfer, poly （ spirobifluorene ） s, dibenzothiophene-S, S- dioxide
