We report the synthesis and optical characterization of a series of metal chalcogenides, A₃SiS₄Te (A = Sr²⁺, Ba²⁺, Eu²⁺), highlighting the metal-atom substitution strategy for the discovery of a high-performance metal chalcogenide-based near-infrared (NIR) scintillator of Eu₃SiS₄Te. Eu₃SiS₄Te exhibits exceptionally broad NIR emission with a full width at half-maximum of 210 nm, the largest among all known Eu²⁺-based NIR emitters. Eu₃SiS₄Te has a high light yield of 41697 photons/MeV and excellent resistance to hygroscopicity. Additionally, Eu₃SiS₄Te boasts a decay time of 531.3 ns, which is merely a quarter of that of the current state-of-the-art NIR scintillators. As a proof of concept, the response to the ²⁴¹Am radioactive source was successfully identified, underscoring its potential for γ-photon-counting applications.

中文翻译：

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通过在金属硫属化物中取代金属原子设计高性能近红外闪烁体


我们报道了一系列金属硫属化物 A₃SiS₄Te （A = Sr²⁺， Ba²⁺， Eu²⁺） 的合成和光学表征，重点介绍了发现高性能金属硫属化物基近红外 （NIR） 闪烁体的金属原子取代策略 Eu₃SiS₄Te。Eu₃SiS₄Te 表现出非常宽的 NIR 发射，半峰全宽为 210 nm，是所有已知的基于 Eu²⁺ 的 NIR 发射器中最大的。Eu₃SiS₄Te 具有 41697 光子/MeV 的高产率和优异的吸湿性。此外，Eu₃SiS₄Te 的衰减时间为 531.3 ns，仅为当前最先进的 NIR 闪烁体的四分之一。作为概念验证，成功确定了对 ²⁴¹Am 放射源的响应，突显了其在γ光子计数应用方面的潜力。