Transparent and Nonflammable Ionogel Photon Upconverters and Their Solute Transport Properties.
Transparent and Nonflammable Ionogel Photon Upconverters and Their Solute Transport Properties.
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DOI：
10.1021/acs.jpcb.5b09880
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
Y. Murakami;Yuki Himuro;Toshiyuki Ito;R. Morita;Kazuki Niimi;Noriko Kiyoyanagi
中科院分区：
文献类型：
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作者：
Y. Murakami;Yuki Himuro;Toshiyuki Ito;R. Morita;Kazuki Niimi;Noriko Kiyoyanagi
基于三重态-三重态湮灭的光子上转换(TTA-UC)是一种将当前被浪费的子带隙光子转换为可用的高能光子的技术。本文首先用离子凝胶剂将含有三重态敏化和发光分子的离子液体凝胶化，得到透明和不可燃的离子凝胶光子上转换管，从而研制出离子凝胶TTA-UC样品。然后研究了离子凝胶样品的光物理性质，结果表明，凝胶对溶质扩散的影响可以忽略不计。为了进一步检验这一建议，并对样品的溶质传输性质有基本的了解，用电化学电位阶跃计时电流法测量了电荷中性溶质物种在比微观聚合物间距离更长的距离上的扩散。结果表明，在所测试的凝胶剂浓度范围内，溶质物种的扩散不受凝胶剂浓度的影响，支持我们对光物理研究的初步结果的解释。总体而言，我们的结果表明，非流动性的优势可以被赋予基于离子液体的光子上变频器，而不会牺牲分子扩散、光学透明度和不可燃性。
Photon upconversion based on triplet-triplet annihilation (TTA-UC) is a technology to convert presently wasted sub-bandgap photons to usable higher-energy photons. In this paper, ionogel TTA-UC samples are first developed by gelatinizing ionic liquids containing triplet-sensitizing and light-emitting molecules using an ionic gelator, resulting in transparent and nonflammable ionogel photon upconverters. The photophysical properties of the ionogel samples are then investigated, and the results suggest that the effect of gelation on the diffusion of the solutes is negligibly small. To further examine this suggestion and acquire fundamental insight into the solute transport properties of the samples, the diffusion of charge-neutral solute species over much longer distances than microscopic interpolymer distances is measured by electrochemical potential-step chronoamperometry. The results reveal that the diffusion of solute species is not affected by gelation within the tested gelator concentration range, supporting our interpretation of the initial results of the photophysical investigations. Overall, our results show that the advantage of nonfluidity can be imparted to ionic-liquid-based photon upconverters without sacrificing molecular diffusion, optical transparency, and nonflammability.