Polyfluorene Terpolymers Containing Phenothiazine and Fluorenone: Effects of Donor and Acceptor Moieties on Energy and Intrachain Charge Transfer Processes in the Photoluminescence and Electroluminescence of Multichromophore Copolymers
Polyfluorene Terpolymers Containing Phenothiazine and Fluorenone: Effects of Donor and Acceptor Moieties on Energy and Intrachain Charge Transfer Processes in the Photoluminescence and Electroluminescence of Multichromophore Copolymers
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DOI：
10.1021/ma0617062
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发表时间：
2006-11
期刊：
影响因子：
5.5
通讯作者：
A. Kulkarni;and Xiangxing Kong;S. Jenekhe
中科院分区：
文献类型：
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作者：
A. Kulkarni;and Xiangxing Kong;S. Jenekhe
通过Suzuki共聚反应合成了5种新的含9，9-二己基荧烯、10-己基吩噻嗪(HPT)供体和9-荧酮(Flo)受体的共聚物，研究了竞争能量和分子内电荷转移过程对多生色团共聚物的光致发光和电致发光的影响。HpT和Flo部分被发现在三元共聚物链上起到了发射激子陷阱的作用，导致了新的蓝绿色(475−485 nm)和绿色(520−525 nm)发光带，以及荧烯链段的蓝色(415 Nm)发射。额外的电荷转移激发态和相关的非辐射衰变通道导致溶液中2−4的因子降低，聚合物的发光量子产率由于HPT的存在而出现。作为发光二极管(LED)的发光材料，三元共聚物呈现绿色到黄色的电致发光，发光亮度为1900−8970cd/m2，转换效率为0.5−3.5cd/A，随组成的不同而不同。作为一个..。
Five new conjugated terpolymers containing 9,9-dihexylfluorene, 10-hexylphenothiazine (HPT) donor, and 9-fluorenone (FLO) acceptor were synthesized by Suzuki copolymerization and used to study the effects of competing energy and intramolecular charge transfer processes on the photoluminescence (PL) and electroluminescence (EL) of multichromophore copolymers. The HPT and FLO moieties were found to act as emissive exciton traps on the terpolymer chains, leading new blue-green (475−485 nm) and green (520−525 nm) emission bands in addition to the blue (415 nm) emission of the fluorene segments. Additional charge transfer excited states and associated nonradiative decay channels resulting in factors of 2−4 decrease in the solution PL quantum yields of the terpolymers emerged due to the HPT moieties. As the emissive materials in light-emitting diodes (LEDs), the terpolymers showed green to yellow EL with luminances of 1900−8970 cd/m2 and efficiencies of 0.5−3.5 cd/A that varied with terpolymer composition. As a...