Discrimination of photo-induced isomerization and molecular reorientation processes in azobenzene derivative doped in a polymer
Discrimination of photo-induced isomerization and molecular reorientation processes in azobenzene derivative doped in a polymer
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DOI：
10.1364/ome.8.000332
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发表时间：
2018-02-01
影响因子：
2.8
通讯作者：
Okoshi, Kento
中科院分区：
文献类型：
--
作者：
Kawabe, Yutaka;Okoshi, Kento
为了研究偶氮分子在聚合物中的光诱导过程，测量了光泵浦前后聚合物中两种偏振分量的吸收光谱和透射率随时间的变化。一个简单的模型被应用到分解角孔燃烧（AHB）由于光异构化和随后的分子重新取向（MRO）的贡献。聚甲基丙烯酸甲酯（PMMA）中分散红1（DR 1）的结果表明，AHB在秒级内占据主导地位，而MRO效应的缓慢积累在较长的时间范围内变得显着。在先前的研究中观察到的几个异常行为将在本研究中给出的背景下进行解释。对染料浓度的依赖性表明，MRO在高负载样品中更显着。此外，在该体系中，光异构化过程的量子产率估计为8%。(c)根据OSA开放获取出版协议的条款，2018年美国光学学会。
In order to investigate the mechanism of photo-induced processes of azo molecules doped in polymer, temporal evolution of the absorption spectrum and transmittance for two polarization components were measured under and after optical pumping. A simple model was applied to decompose the contributions from angular hole burning (AHB) due to photoisomerization and following molecular reorientation (MRO). The result for disperse red 1 (DR1) in poly-methyl methacrylate (PMMA) indicated the dominance of AHB in the order of seconds while slow accumulation of the MRO effect became significant during a longer time range. Several extraordinary behaviors observed in preceding studies will be explained in context given in this study. Dependence on dye concentration showed that MRO was more significant in highly loaded samples. Further, quantum yield of photo-isomerization process in this system was estimated to be 8%. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.