Li Xuefeng, Zhao Haocheng, Gao Long, Xie Xiaoling, Zhang Weixuan, Wang Mixue, Wu Yuling, Miao Yanqin, Wang Hua, Xu Bingshe
College of Materials Science and Engineering, Taiyuan University of Technology Taiyuan 030024 China
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
RSC Adv. 2019 Nov 5;9(62):36058-36065. doi: 10.1039/c9ra07371j. eCollection 2019 Nov 4.
In this work, a series of hyperbranched copolymers with fluorene--carbazole as the branches, three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core, and iridium 1-(4-bromophenyl)-isoquinoline (acetylacetone) (Ir(Brpiq)acac) as the dimming group were synthesized by one-pot Suzuki polycondensation for white emission. All copolymers show great thermal stabilities and high hole-transporting ability due to the introduction of the carbazole unit. The hyperbranched structures for copolymers can suppress the interchain interactions efficiently, and help to form amorphous films. The fabricated polymer light-emitting devices (PLEDs) based on the above synthesized copolymers realize good white light emission, and achieve high electroluminescence (EL) performance. For example, for the optimized PLED, the maximum luminance and current efficiency reach 6210 cd m and 6.30 cd A, respectively, indicating the synthesized hyperbranched copolymers have potential application in solution-processable white polymer light-emitting diodes.
在本工作中，通过一锅法铃木缩聚反应合成了一系列以芴-咔唑为支链、三维结构的螺[3.3]庚烷-2,6-二螺芴（SDF）为核、1-(4-溴苯基)-异喹啉（乙酰丙酮）铱（Ir(Brpiq)acac）为调光基团的超支化共聚物，用于白色发光。由于咔唑单元的引入，所有共聚物都表现出优异的热稳定性和高空穴传输能力。共聚物的超支化结构可以有效地抑制链间相互作用，并有助于形成非晶薄膜。基于上述合成共聚物制备的聚合物发光器件（PLED）实现了良好的白光发射，并具有高的电致发光（EL）性能。例如，对于优化后的PLED，最大亮度和电流效率分别达到6210 cd m和6.30 cd A，表明合成的超支化共聚物在溶液可加工的白色聚合物发光二极管中具有潜在应用。
