Efficient Triplet-Triplet Annihilation Upconversion with an Anti-Stokes Shift of 1.08 eV Achieved by Chemically Tuning Sensitizers,Journal of the American Chemical Society

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Efficient Triplet-Triplet Annihilation Upconversion with an Anti-Stokes Shift of 1.08 eV Achieved by Chemically Tuning Sensitizers
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-08-30 , DOI: 10.1021/jacs.9b05824
Chunying Fan ₁ , Lingling Wei ₁ , Tong Niu ₁ , Ming Rao ₁ , Guo Cheng ₁ , Jason J Chruma ₁ , Wanhua Wu ₁ , Cheng Yang ₁

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A series of Pt(II)-Schiff base complexes were synthesized as triplet sensitizers for the purpose of tuning the singlet and triplet energy levels so as to minimize energy loss during triplet-triplet annihilation (TTA) upconversion (UC). A deep-red to blue TTA-UC was achieved with an unprecedentedly large anti-Stokes shift of 1.08 eV. UC quantum yields of up to 21% (with a theoretical maximum efficiency of 50%) were observed in solution. The complexes also showed efficient UC emission in air-saturated hydrogels with a UC quantum yield up to 14.8%, which is much higher than the highest previously reported value. The low threshold excitation intensity provided by the present system offers promising potential for application in terrestrial solar energy conversion.

中文翻译：

通过化学调谐敏化剂实现具有 1.08 eV 反斯托克斯位移的高效三重-三重湮灭上转换

合成了一系列 Pt(II)-Schiff 碱配合物作为三线态敏化剂，目的是调整单线态和三线态能级，从而最大限度地减少三线态-三线态湮灭 (TTA) 上转换 (UC) 过程中的能量损失。以前所未有的大反斯托克斯位移 1.08 eV 实现了深红色到蓝色的 TTA-UC。在溶液中观察到高达 21% 的 UC 量子产率（理论最大效率为 50%）。该复合物还在空气饱和水凝胶中显示出有效的 UC 发射，UC 量子产率高达 14.8%，远高于先前报道的最高值。本系统提供的低阈值激发强度为在地面太阳能转换中的应用提供了有希望的潜力。

更新日期：2019-08-30

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