Circularly polarized luminescence from individual microstructures of conjugated polymer aggregates with solvent-induced chirality
Circularly polarized luminescence from individual microstructures of conjugated polymer aggregates with solvent-induced chirality
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DOI：
10.1039/c4cp02643h
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发表时间：
2014-09-07
影响因子：
3.3
通讯作者：
Vacha, Martin
中科院分区：
文献类型：
--
作者：
Katayama, Kenta;Hirata, Shuzo;Vacha, Martin
本文报道了共轭聚合物F8BT聚集体R和S异构体圆偏振发光（CPL）的微观研究，F8BT是一种含有芴和噻吩单体单元的共聚物。在溶液聚集过程中，(R)-或(S)-柠檬烯的加入可诱导聚集物的手性。固体样品是通过滴铸或旋转涂层的骨料溶液制备的。CPL不对称参数g对单个聚集体微结构的测量显示，即使对于相同的异构体，其值也有从正到负的广泛分布。R和S异构体的g分布中心的差异反映了来自手性聚集体的内在CPL，并且发现它取决于聚集体结构的大小。另一方面，分布的大宽度归因于样品内CPL沿光路的相位延迟引起的光学效应。
We report a microscopic study of circularly polarized luminescence (CPL) from R and S isomers of aggregates of the conjugated polymer F8BT, a copolymer containing fluorene and thiophene monomer units. Chirality in the aggregates is induced by addition of either (R)- or (S)-limonene during aggregation in solution. Solid-state samples are prepared either by drop-casting or spin-coating of the aggregate solution. CPL dissymmetry parameter g measured for individual aggregate microstructures shows a broad distribution of values ranging from positive to negative even for the same isomer. The difference in the centers of the g distribution between the R and S isomers reflects the intrinsic CPL from the chiral aggregates, and is found to depend on the size of the aggregate structures. On the other hand, the large widths of the distributions are ascribed to an optical effect arising from phase retardation along the optical path of the CPL inside the sample.