Hybrid-state emission in a polythienylenevinylene derivative with an electron deficient moiety.
Hybrid-state emission in a polythienylenevinylene derivative with an electron deficient moiety.
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具有缺电子部分的聚噻吩乙烯撑衍生物中的混合态发射。
DOI：
10.1063/1.4918744
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Cheng Zhang
中科院分区：
文献类型：
--
作者：
E. Lafalce;Xiaomei Jiang;Jianjun Pan;Christi L. Whittington;R. Larsen;L. Sanow;Cheng Zhang
研究了一种新型的酰亚胺取代的聚(3-噻吩亚甲基)衍生物(ImidePTV)在薄膜和溶液中的光致发光。测得PL的量子效率比它的非发光对应物，即烷基取代的PTV大两个数量级以上，并被解释为光学允许的1(1)Bu和光学禁止的2(1)Ag激子态的近简并证据。结果发现，2(1)Ag和1(1)Bu的发射共存，且优势对温度和形态环境敏感。在高极性和高极化率的溶剂中以及低温薄膜中，溶液的PL主要由偶极允许的1(1)Bu态的跃迁所控制。另一方面，高温下薄膜和溶液的光致发光光谱主要来自2(1)Ag态，该态通过与1(1)Bu的非对称微扰混合而获得有限的透射矩。
The photoluminescence (PL) of a novel imide-substituted poly(3-thienylenevinylene) derivative (imidePTV) was studied in film and solution. PL quantum efficiency was measured to be more than two orders of magnitude larger than its nonluminescent counterpart, namely, alkyl-substituted PTV and was interpreted as evidence for a near degeneracy of optically allowed 1(1)Bu and optically forbidden 2(1)Ag excitonic states. As a result, coexistence of 2(1)Ag and 1(1)Bu emissions was observed, and the predominance was found to be sensitive to temperature and morphological environment. PL of solutions in solvents of higher polarity and polarizability and from low-temperature films was dominated by the transition from the dipole allowed 1(1)Bu state. On the other hand, the PL spectra of films at high temperature and solutions in solvents of low polarity and polarizability were primarily from the 2(1)Ag state that obtains a finite transmission moment from an asymmetric perturbation mixing with the 1(1)Bu.