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Steric-Hindrance-Functionalized Polydiarylfluorenes: Conformational Behavior, Stabilized Blue Electroluminescence, and Efficient Amplified Spontaneous Emission
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-10-19 00:00:00 , DOI: 10.1021/acsami.7b08980 Lubing Bai 1 , Bin Liu 2 , Yamin Han 1 , Mengna Yu 2 , Jiong Wang 2 , Xinwen Zhang 2 , Changjin Ou 1 , Jinyi Lin 1 , Wensai Zhu 1 , Linghai Xie 2 , Chengrong Yin 1 , Jianfeng Zhao 1 , Jianpu Wang 1 , Donal D. C. Bradley 3 , Wei Huang 1, 2, 4
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-10-19 00:00:00 , DOI: 10.1021/acsami.7b08980 Lubing Bai 1 , Bin Liu 2 , Yamin Han 1 , Mengna Yu 2 , Jiong Wang 2 , Xinwen Zhang 2 , Changjin Ou 1 , Jinyi Lin 1 , Wensai Zhu 1 , Linghai Xie 2 , Chengrong Yin 1 , Jianfeng Zhao 1 , Jianpu Wang 1 , Donal D. C. Bradley 3 , Wei Huang 1, 2, 4
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Control of the hierarchical molecular organization of polydiarylfluorenes by synthetic strategies is significant for optimizing photophysical properties as well as the performance of light-emitting devices. Herein, for the suppression of molecular aggregation and enhancement of luminescence efficiency, a series of steric units were introduced into polydiarylfluorenes by copolymerization, with the aim of integrating the advantages of the steric-hindrance effect and of the β-phase. Optical and Raman spectroscopies revealed a β-phase conformation for a polymer copolymerized with spiro[fluorene-9,9′-xanthene] (SFX), with photoluminescence (PL) peaks at 454, 482, and 517 nm. Moreover, the morphological stability and electroluminescence (EL) stability were also improved without compromising the performance of the polymer light-emitting diodes (PLEDs). Furthermore, three steric-hindrance-functionalized copolymers showed significantly decreased thresholds for amplified spontaneous emission (EthASE) and enhanced stability following thermal annealing treatment. These results indicate that steric-hindrance functionalization is a superior approach to improve the overall stability and optoelectronic properties for blue-light-emitting π-conjugated polymers.
中文翻译：
立体阻碍功能的聚二芳基芴：构象行为，稳定的蓝色电致发光和有效的放大的自发发射。
通过合成策略控制聚二芳基芴的分级分子组织对于优化光物理性质以及发光器件的性能是重要的。在本文中，为了抑制分子聚集并提高发光效率，通过共聚将一系列空间单元引入聚二芳基芴中，目的是整合空间抑制作用和β相的优点。光学和拉曼光谱显示与螺[芴-9,9'-吨]（SFX）共聚的聚合物的β相构象，其光致发光（PL）峰位于454、482和517 nm。此外，在不损害聚合物发光二极管（PLED）的性能的情况下，还改善了形态稳定性和电致发光（EL）稳定性。È第ASE）和之后的热退火处理来提高稳定性。这些结果表明，位阻官能化是改善发蓝光的π-共轭聚合物的整体稳定性和光电性能的优良方法。
更新日期：2017-10-19
中文翻译：
立体阻碍功能的聚二芳基芴：构象行为，稳定的蓝色电致发光和有效的放大的自发发射。
通过合成策略控制聚二芳基芴的分级分子组织对于优化光物理性质以及发光器件的性能是重要的。在本文中，为了抑制分子聚集并提高发光效率，通过共聚将一系列空间单元引入聚二芳基芴中，目的是整合空间抑制作用和β相的优点。光学和拉曼光谱显示与螺[芴-9,9'-吨]（SFX）共聚的聚合物的β相构象，其光致发光（PL）峰位于454、482和517 nm。此外，在不损害聚合物发光二极管（PLED）的性能的情况下，还改善了形态稳定性和电致发光（EL）稳定性。È第ASE）和之后的热退火处理来提高稳定性。这些结果表明，位阻官能化是改善发蓝光的π-共轭聚合物的整体稳定性和光电性能的优良方法。
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