Temperature‐Inert Coinage Metal Cluster Scintillator

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Angewandte Chemie Int Ed, Wiley-VCH

Content

Angewandte Chemie International Edition, EarlyView.

A temperature‐inert coinage metal cluster scintillator with excellent water–oxygen stability and thermal stability was developed, which was successfully used in temperature‐independent high‐resolution X‐ray imaging, and the resolution at different temperatures was maintained above 20 LP mm−1. Abstract Scintillators can convert high‐energy ionizing radiation, such as X‐ray, into low‐energy ultraviolet‐visible photons, and they have been widely used in various fields. However, like most luminogens, the emission intensity of a scintillator is usually influenced by the environmental temperature, increasing the temperature results in extreme decreases in radioluminescence. Here, a temperature‐inert coinage metal cluster scintillator of Cu4S was prepared, and it exhibited not only intense radioluminescence at room temperature but also minimal fluctuations from 80 to 450 K. Mechanism study revealed that Cu4S is a typical thermally activated delayed fluorescence (TADF) luminogen. Owing to the strong C─H···π interactions between the clusters, the geometric relaxation of Cu4S was restricted during the spin crossover process, leading to an exceptionally small reorganization energy. This induced intersystem crossing within the Marcus inverted region, resulting in temperature‐independent luminescence behavior. More importantly, Cu4S metal cluster has excellent water‒oxygen stability and thermal stability and can be used to prepare flexible scintillator screen with polydimethylsiloxane (PDMS). On the basis of these features, temperature‐independent high‐resolution X‐ray imaging with the Cu4S‐PDMS scintillator screen was achieved, and the resolution at different temperatures was maintained above 20 LP mm−1.

A temperature-inert coinage metal cluster scintillator with excellent water–oxygen stability and thermal stability was developed, which was successfully used in temperature-independent high-resolution X-ray imaging, and the resolution at different temperatures was maintained above 20 LP mm⁻¹.

Abstract

Scintillators can convert high-energy ionizing radiation, such as X-ray, into low-energy ultraviolet-visible photons, and they have been widely used in various fields. However, like most luminogens, the emission intensity of a scintillator is usually influenced by the environmental temperature, increasing the temperature results in extreme decreases in radioluminescence. Here, a temperature-inert coinage metal cluster scintillator of Cu₄S was prepared, and it exhibited not only intense radioluminescence at room temperature but also minimal fluctuations from 80 to 450 K. Mechanism study revealed that Cu₄S is a typical thermally activated delayed fluorescence (TADF) luminogen. Owing to the strong C─H···π interactions between the clusters, the geometric relaxation of Cu₄S was restricted during the spin crossover process, leading to an exceptionally small reorganization energy. This induced intersystem crossing within the Marcus inverted region, resulting in temperature-independent luminescence behavior. More importantly, Cu₄S metal cluster has excellent water‒oxygen stability and thermal stability and can be used to prepare flexible scintillator screen with polydimethylsiloxane (PDMS). On the basis of these features, temperature-independent high-resolution X-ray imaging with the Cu₄S-PDMS scintillator screen was achieved, and the resolution at different temperatures was maintained above 20 LP mm⁻¹.

You‐Song Hu, Yan‐Hao Liu, Ruo‐Yu Cao, Yu‐Bing Si, Wei‐Miao He, Ruo‐Yu Fang, Jia‐Wang Yuan, Qiu‐Chen Peng, Zhao‐Yang Wang, Kai Li, Shuang‐Quan Zang

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