Photon Upconverting Liquids: Matrix-Free Molecular Upconversion Systems Functioning in Air,Journal of the American Chemical Society

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Photon Upconverting Liquids: Matrix-Free Molecular Upconversion Systems Functioning in Air
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2013-12-12 , DOI: 10.1021/ja411316s
Pengfei Duan ₁ , Nobuhiro Yanai ₁ , Nobuo Kimizuka ₁

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A nonvolatile, in-air functioning liquid photon upconverting system is developed. A rationally designed triplet sensitizer (branched alkyl chain-modified Pt(II) porphyrin) is homogeneously doped in energy-harvesting liquid acceptors with a 9,10-diphenylanthracene unit. A significantly high upconversion quantum yield of ∼28% is achieved in the solvent-free liquid state, even under aerated conditions. The liquid upconversion system shows a sequence of efficient triplet energy transfer and migration of two itinerant excited states which eventually collide with each other to produce a singlet excited state of the acceptor. The observed insusceptibility of upconversion luminescence to oxygen indicates the sealing ability of molten alkyl chains introduced to liquefy chromophores. The involvement of the energy migration process in triplet-triplet annihilation (TTA) provides a new perspective in designing advanced photon upconversion systems.

中文翻译：

光子上转换液体：在空气中运行的无基质分子上转换系统

开发了一种非挥发性、在空气中起作用的液体光子上转换系统。合理设计的三线态敏化剂（支链烷基链修饰的 Pt(II) 卟啉）均匀掺杂在具有 9,10-二苯基蒽单元的能量收集液体受体中。即使在充气条件下，在无溶剂液态下也可实现约 28% 的显着高转换量子产率。液体上转换系统显示了一系列有效的三线态能量转移和两种流动激发态的迁移，最终相互碰撞以产生受体的单线态激发态。观察到的上转换发光对氧的不敏感性表明引入熔融烷基链以液化发色团的密封能力。

更新日期：2013-12-12

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