Synthesis and Characterization of Kinked and Hyperbranched Carbazole/Fluorene-Based Copolymers
Synthesis and Characterization of Kinked and Hyperbranched Carbazole/Fluorene-Based Copolymers
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DOI：
10.1021/ma061770j
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发表时间：
2006-09
期刊：
影响因子：
5.5
通讯作者：
Chung-Wen Wu;Hong‐Cheu Lin
中科院分区：
文献类型：
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作者：
Chung-Wen Wu;Hong‐Cheu Lin
为了减少聚芴（PFs）的聚集现象，提高其发光性能，采用Suzuki偶联缩聚反应合成了一系列新型的扭结和超支化咔唑单元，以引入无序堆积的共聚物骨架。研究了共聚物的热、物理、电化学和电致发光性能。所有这些聚合物都具有优异的热稳定性，起始分解温度为407 - 466 °C，玻璃化转变温度为109 - 140 °C。光致发光（PL）研究表明，这些聚合物是有前途的蓝色发光材料，在溶液和固体状态下表现出高的量子效率。在500 - 600 nm的长波长发射，这是典型的PF，由于它们在固态下的自聚集，在这些聚合物中被抑制。在空气中退火的研究表明，这两个改进的热和光致发光的聚合物的稳定性。事实证明，HOMO…
To decrease the aggregation phenomena and improve the luminescent properties of polyfluorenes (PFs), a series of novel kinked and hyperbranched carbazole units were copolymerized by the Suzuki coupling polycondensation reaction to introduce disorder packing into the copolymer backbones. The thermal, photophysical, electrochemical, and electroluminescent properties of the copolymers were investigated. All of these polymers possess excellent thermal stability with onset decomposition temperatures at 407−466 °C and glass transition temperatures at 109−140 °C. Photoluminescent (PL) studies showed that these polymers were promising blue light-emitting materials, which exhibited high quantum efficiencies in solution and solid states. Long wavelength emissions at 500−600 nm, which were typical for PFs due to their self-aggregation in the solid state, were suppressed in these polymers. Annealing studies under air showed both improved thermal and photoluminescence stability of the polymers. It was proven that HOMO...