Triplet Sensitization and Photon Upconversion Using InP-Based Quantum Dots,Journal of the American Chemical Society

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Triplet Sensitization and Photon Upconversion Using InP-Based Quantum Dots
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-10 , DOI: 10.1021/jacs.0c09547
Runchen Lai ₁ , Youbao Sang _{2,

3} , Yang Zhao ₄ , Kaifeng Wu ₁

Affiliation

Molecular triplet sensitization using colloidal semiconductor nanocrystals or quantum dots (QDs) is important for many photochemical and photonic applications. Current QD sensitizers often contain toxic elements such as Cd and Pb. In order to "go green" with these sensitizers, we investigate triplet energy transfer from InP-based QDs. Time-resolved spectroscopy studies revealed picosecond hole trapping in core-only QDs, which could complicate and/or inhibit energy transfer. We therefore developed InP/ZnSe/ZnS core/shell QDs that effectively suppressed hole trapping and meanwhile allowed for triplet energy transfer to surface-anchored anthracene acceptors with an efficiency of 84%. The sensitized molecular triplets participated in triplet-triplet-annihilation, enabling photon upconversion with a normalized quantum yield reaching 10.0% ± 0.1%. This study demonstrates that nontoxic InP-based QDs can be engineered to be on par with state-of-the-art Cd- or Pb-containing QDs for use as triplet sensitizers.

中文翻译：

使用基于 InP 的量子点进行三重态敏化和光子上转换

使用胶体半导体纳米晶体或量子点 (QD) 的分子三线态敏化对于许多光化学和光子应用很重要。目前的 QD 敏化剂通常含有有毒元素，如 Cd 和 Pb。为了使用这些敏化剂“走向绿色”，我们研究了基于 InP 的 QD 的三重态能量转移。时间分辨光谱研究揭示了仅核心 QD 中的皮秒空穴捕获，这可能会使能量转移复杂化和/或抑制。因此，我们开发了 InP/ZnSe/ZnS 核/壳量子点，可有效抑制空穴捕获，同时允许以 84% 的效率将三线态能量转移到表面锚定的蒽受体。敏化的分子三重态参与三重态-三重态-湮灭，使光子上转换，归一化量子产率达到 10.0% ± 0。1%。这项研究表明，无毒的基于 InP 的 QD 可以设计为与最先进的含 Cd 或 Pb 的 QD 相当，用作三线态敏化剂。

更新日期：2020-11-10

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