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ZnSe/ZnS Core/Shell Quantum Dots as Triplet Sensitizers toward Visible-to-Ultraviolet B Photon Upconversion
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-02-08 , DOI: 10.1021/acsenergylett.2c00017 Xuyang Lin 1, 2 , Zongwei Chen 3 , Yaoyao Han 1, 2 , Chengming Nie 1 , Pan Xia 1 , Shan He 1 , Juntao Li 2, 4 , Kaifeng Wu 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-02-08 , DOI: 10.1021/acsenergylett.2c00017 Xuyang Lin 1, 2 , Zongwei Chen 3 , Yaoyao Han 1, 2 , Chengming Nie 1 , Pan Xia 1 , Shan He 1 , Juntao Li 2, 4 , Kaifeng Wu 1
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Recent years have seen a growing interest in developing heavy-metal-free colloidal quantum dots (QDs), such as InP, Si, and CuInS2, as sensitizers for photochemistry. None of these materials, however, could cover the blue part of the spectrum for applications such as blue-to-ultraviolet photon upconversion that is of particular interest for photocatalysis. Herein we report blue-emitting ZnSe/ZnS core/shell QDs as molecular triplet sensitizers for photon upconversion down to the <320 nm region (ultraviolet-B). The upconversion system consists of carboxylated biphenyl as transmitter ligands for QDs and functionalized naphthalene or biphenyl as annihilators (emitters), with the normalized quantum efficiency reaching 6.2 ± 0.2%. Time-resolved spectroscopy reveals that triplet energy transfer from QDs to biphenyl is mediated by an electron transfer step, highlighting the strong reducing power of the band-edge electrons of ZnSe-related QDs that may play a unique role for photochemical applications.
中文翻译：
ZnSe/ZnS 核/壳量子点作为三重态敏化剂对可见光到紫外 B 光子上转换
近年来，人们对开发无重金属胶体量子点 (QD) 的兴趣日益浓厚，例如 InP、Si 和 CuInS 2，作为光化学的敏化剂。然而，这些材料中没有一种可以覆盖光谱的蓝色部分，用于光催化特别感兴趣的蓝色到紫外线光子上转换等应用。在这里，我们报告了蓝色发射 ZnSe/ZnS 核/壳 QD 作为分子三重态敏化剂，用于将光子上转换到 <320 nm 区域（紫外线-B）。上转换系统由羧化联苯作为量子点的递质配体和功能化的萘或联苯作为湮灭剂（发射体）组成，归一化量子效率达到 6.2 ± 0.2%。时间分辨光谱表明，从量子点到联苯的三重态能量转移是由电子转移步骤介导的，
更新日期：2022-02-08
中文翻译：
ZnSe/ZnS 核/壳量子点作为三重态敏化剂对可见光到紫外 B 光子上转换
近年来，人们对开发无重金属胶体量子点 (QD) 的兴趣日益浓厚，例如 InP、Si 和 CuInS 2，作为光化学的敏化剂。然而，这些材料中没有一种可以覆盖光谱的蓝色部分，用于光催化特别感兴趣的蓝色到紫外线光子上转换等应用。在这里，我们报告了蓝色发射 ZnSe/ZnS 核/壳 QD 作为分子三重态敏化剂，用于将光子上转换到 <320 nm 区域（紫外线-B）。上转换系统由羧化联苯作为量子点的递质配体和功能化的萘或联苯作为湮灭剂（发射体）组成，归一化量子效率达到 6.2 ± 0.2%。时间分辨光谱表明，从量子点到联苯的三重态能量转移是由电子转移步骤介导的，
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