优质Cs3Cu2I5单晶是一种快衰变闪烁体,Advanced Optical Materials

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优质Cs3Cu2I5单晶是一种快衰变闪烁体
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-09-11 , DOI: 10.1002/adom.202201161
Qian Yao ₁ , Jiaming Li _{2,

3} , Xuesong Li ₁ , Xiaoxin Zheng ₁ , Zungang Wang ₂ , Xutang Tao ₁

Affiliation

卤化铜 (I) 钙钛矿 Cs ₃ Cu ₂ I ₅最近引起了极大的兴趣，并且由于其高量子产率而被认为是一种非常有前途的闪烁体。然而，其缓慢的闪烁衰减时间（以前被认为是固有特性）是阻碍其实际应用和商业化的重大缺陷。但在这项工作中，发现高质量的 Cs ₃ Cu ₂ I ₅通过设计的水溶液法生长的单晶出人意料地表现出 39 ns (82%) 的快速闪烁衰减时间，这与之前的报告完全不同。这种颠覆性的变化可能是由于具有更致密的 0D 结构和低陷阱密度（6.41 × 10 ⁸ cm ^–3）的高晶体质量，改变了激发态结构变形并加速了电子和空穴的复合，同时直接减少了延长由固有缺陷引起的衰减时间。此外，摇摆曲线FWHM值仅为50.4˝的单晶具有很高的透光率（85%）、极高的绝对光致发光量子产率（PLQY，97.76%）、优越的环境稳定性、优异的光产率和不同γ射线源下的能量分辨率（²⁴¹ Am、⁶⁰ Co、²² Na、¹³⁷ Cs、¹⁵² Eu）。这些非凡的性能为后续的实际应用开发铺平了道路。

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High-Quality Cs3Cu2I5 Single-Crystal is a Fast-Decaying Scintillator

Copper(I) halide perovskite Cs₃Cu₂I₅ has recently attracted tremendous interest and has been considered an exceptionally promising scintillator due to its high quantum yield. However, its slow scintillation decay time, previously considered an intrinsic property, is a significant drawback preventing its practical application and commercialization. But in this work, it is found that the high-quality Cs₃Cu₂I₅ single-crystal grown by the designed aqueous solution method surprisingly exhibits a fast scintillation decay time of 39 ns (82%), quite different from previous reports. This subversive change may be due to the high crystal quality with denser 0D structure and low trap density (6.41 × 10⁸ cm^–3), changing the excited-state structural deformation and accelerating the recombination of electrons and holes while directly reducing the prolongation of decay time caused by inherent defects. Moreover, the single-crystal with a rocking curve FWHM value of only 50.4˝ has a high optical transmittance (85%), a very high absolute photoluminescence quantum yield (PLQY, 97.76%), superior environmental stability, and excellent light-yield and energy resolution under different γ-ray sources (²⁴¹Am, ⁶⁰Co, ²²Na, ¹³⁷Cs, ¹⁵²Eu). These extraordinary properties pave the way for the subsequent development of practical applications.

更新日期：2022-09-11

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