Triplet Sensitization by "Self-Trapped" Excitons of Nontoxic CuInS2 Nanocrystals for Efficient Photon Upconversion

Journal of the American Chemical Society
Yaoyao HanKaifeng Wu

Abstract

Triplet energy transfer (TET) from semiconductor nanocrystals (NCs) has recently emerged as a new triplet sensitization paradigm. It remains unclear how trap states pervasive in NCs influence TET or whether trapped excitons can undergo efficient TET. Here we partially address this issue by studying TET from CuInS2 NCs as a model system because their photogenerated excitons are known to be "self-trapped" due to hole localization to intragap Cu states. We found that, thanks to the long lifetime (209 ± 17 ns) of self-trapped excitons, they could be extracted with an efficiency of ∼92.3% by surface-anchored anthracene despite that the TET rate was relatively slow (57.1 ± 1.7 μs-1). We further leveraged this efficient sensitization to achieve triplet-triplet-annihilation photon upconversion (TTA-UC) with a quantum yield of 18.6 ± 0.3%. Thus, this study not only demonstrates trapped excitons can undergo efficient TET as well, but also presents the first TTA-UC system sensitized by nontoxic NCs which is important for the real-life application of this technique.

References

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Mar 14, 2019·The Journal of Physical Chemistry Letters·Yaoyao HanKaifeng Wu
Mar 19, 2019·The Journal of Physical Chemistry Letters·Anne C BerendsCelso de Mello Donega

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Citations

Nov 7, 2019·Angewandte Chemie·Eric C HansenMoungi G Bawendi
Feb 25, 2020·Angewandte Chemie·Nobuhiro Yanai, Nobuo Kimizuka
Aug 31, 2020·Chemical Science·Christopher M PapaFelix N Castellano
Sep 24, 2020·The Journal of Chemical Physics·Emily M RigsbyMing Lee Tang
Aug 24, 2020·The Journal of Chemical Physics·Tao Jin, Tianquan Lian
Apr 10, 2021·The Journal of Physical Chemistry Letters·Daniel T YonemotoFelix N Castellano
Feb 20, 2020·Journal of the American Chemical Society·Junhui WangKaifeng Wu
Jun 2, 2020·Journal of the American Chemical Society·Xiao LuoKaifeng Wu
Jun 5, 2020·Journal of the American Chemical Society·Daniel T YonemotoFelix N Castellano
Nov 11, 2020·Journal of the American Chemical Society·Runchen LaiKaifeng Wu
Mar 3, 2020·The Journal of Physical Chemistry Letters·Yuyang TianKaifeng Wu

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