Suppressing aggregation induced quenching in anthracene based conjugated polymers
Suppressing aggregation induced quenching in anthracene based conjugated polymers
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DOI：
10.1039/d1py00118c
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发表时间：
2021-03-28
影响因子：
4.6
通讯作者：
Bronstein, Hugo
中科院分区：
文献类型：
--
作者：
Congrave, Daniel G.;Drummond, Bluebell H.;Bronstein, Hugo
蒽是发光共轭聚合物的非常有价值的构建单元，特别是当需要大的单线态-三线态能隙（Delta E-ST）时。不幸的是，蒽的扩展π体系赋予了聚合物聚集的强烈倾向，从而对其固态光物理产生有害影响。从溶液到固态时，光致发光量子产率（PLQY，phi(F)）大幅下降尤其常见，以低 phi(R) 表示（phi(R) = phi(F film)/phi(F sol.)）。由于诸如准分子形成等过程，固态荧光的显着且不希望的红移也是典型的。在这项工作中，开发了一系列烯基封装的共轭蒽聚合物来克服这些具有挑战性的问题。我们展示了一种有前途的材料，它表现出良好的固态 PLQY，与溶液测量相比，该材料实际上没有变化（phi(R) 类似于 1，phi(F 薄膜) 类似于 40%），同时溶液和薄膜中具有相同的 PL 0-0 跃迁波长。这种发光特性从溶液到固态的直接转移对于共轭聚合物来说是显着的，对于基于蒽的聚合物来说是完全前所未有的。
Anthracene is a highly valuable building block for luminescent conjugated polymers, particularly when a large singlet-triplet energy gap (Delta E-ST) is desired. Unfortunately, the extended pi system of anthracene imparts a strong tendency for polymer aggregation, resulting in detrimental effects on its solid state photophysics. A large decrease in photoluminescence quantum yield (PLQY, phi(F)) on going from solution to the solid state is especially common, represented in terms of a low phi(R) (phi(R) = phi(F film)/phi(F sol.)). Significant and undesirable red-shifting of fluorescence in the solid state is also typical due to processes such as excimer formation. In this work a series of alkylene-encapsulated conjugated anthracene polymers is developed to overcome these challenging problems. We demonstrate a promising material which displays a good solid state PLQY that is effectively unchanged compared to solution measurements (phi(R) similar to 1, phi(F film) similar to 40%), alongside an identical PL 0-0 transition wavelength in solution and thin film. Such a direct transfer of luminescence properties from solution to the solid state is remarkable for a conjugated polymer and completely unprecedented for one based on anthracene.