双发色三重态光敏剂的新设计及其在三重态-三重态An灭上转换中的应用,Advanced Optical Materials

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双发色三重态光敏剂的新设计及其在三重态-三重态An灭上转换中的应用
Advanced Optical Materials ( IF 9 ) Pub Date : 2018-01-19 , DOI: 10.1002/adom.201700981
Xinyan Guo ₁ , Yiming Liu ₁ , Qi Chen ₁ , Dahui Zhao ₁ , Yuguo Ma ₁

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作为必不可少的分子成分，光敏剂在确定三重态-三重态an灭上转换（TTA UC）的量子效率中起着至关重要的作用。近年来，通过非相干激励源实现大的反斯托克斯频移，这项新兴技术引起了极大的关注。在典型的TTA UC中，低能光子首先由光敏剂收集，光敏剂在系统间穿越（ISC）时经历三重态-三重态能量转移（TTET）到发射体（即an灭者）。发射极中的双分子TTA之后，发射极的单重激发态释放出高能光子。显然，光子吸收，ISC和TTET的效率都取决于敏化剂。使用需要碰撞相互作用的Dexter型ET机制，供体（光敏剂）的三重态寿命长显然有利于提高TTET的效率。该进展报告总结了用于TTA UC的光敏剂的最新进展，其中许多具有双发色分子支架。在这种双发色设计带来的各种后果和功能中，延长的三重态寿命是TTA UC的一项特别有利的性能。另外，这些具有长三重态寿命的新型强效光敏剂也可用于其他应用，例如单线态氧敏化和氧感测。在这种双发色设计带来的各种后果和功能中，延长的三重态寿命是TTA UC的一项特别有利的性能。另外，这些具有长三重态寿命的新型强效光敏剂也可用于其他应用，例如单线态氧敏化和氧感测。在这种双发色设计带来的各种后果和功能中，延长的三重态寿命是TTA UC的一项特别有利的性能。另外，这些具有长三重态寿命的新型强效光敏剂也可用于其他应用，例如单线态氧敏化和氧感测。

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New Bichromophoric Triplet Photosensitizer Designs and Their Application in Triplet–Triplet Annihilation Upconversion

As indispensable molecular components, photosensitizers play a crucial role in determining the quantum efficiency of triplet–triplet annihilation upconversion (TTA UC). This emergent technology has attracted great attention in recent years for realizing large anti‐Stokes shifts with noncoherent excitation sources. In a typical TTA UC, low‐energy photons are first harvested by the photosensitizers, which upon intersystem crossing (ISC) undergo triplet–triplet energy transfer (TTET) to emitters (i.e., annihilators). Following the bimolecular TTA among the emitters, high‐energy photons are given off by the singlet excited state of the emitters. Apparently, the efficiencies of photon absorption, ISC, and TTET are all dependent on the sensitizers. With a Dexter‐type ET mechanism requiring collisional interactions, a long triplet lifetime of the energy donor (photosensitizer) is evidently favorable for enhancing the efficiency of TTET. This progress report summarizes the recent developments of photosensitizers used for TTA UC, many of which feature a bichromophoric molecular scaffold. Among the various consequences and functions entailed by such bichromophoric designs, the extended triplet lifetime is a particularly advantageous property for TTA UC. Additionally, these new potent photosensitizers with long triplet lifetimes are also useful for other applications such as singlet oxygen sensitization and oxygen sensing.

更新日期：2018-01-19

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