ハロゲン化物シンチレータの発光効率向上技術を開発（New Strategy Enhances Light Output in Halide Scintillators）

2026-04-15 中国科学院（CAS）

Strong Confined Exciton Luminescence in Low-Dimensional Metal Halides Achieved Through Structural Modulation (Image by SICCAS)

＜関連情報＞

• https://english.cas.cn/newsroom/research-news/202605/t20260509_1158652.shtml
• https://spj.science.org/doi/10.34133/research.1230

励起子閉じ込め操作によるゼロ次元ハロゲン化物における巨大なシンチレーション収量向上 Giant Scintillation Yield Enhancement in Zero-Dimensional Halides by Exciton Confinement Manipulation

Yujie Wang, Xuemin Wen, Hongliang Shi, Eva Mihóková, […] , and Yuntao Wu
Research  Published:14 Apr 2026
DOI:https://doi.org/10.34133/research.1230

Abstract

Low-dimensional halides (LDHs) with self-trapped exciton (STE) emission are promising materials for scintillation applications. Nonetheless, for almost all LDHs, the measured scintillation yield is still far below theoretical value due to severe exciton–exciton/exciton–defect interaction under ionizing radiation, despite high photoluminescence quantum yield (PLQY). Here, we reported a substantial enhancement of scintillation yield in zero-dimensional (0D) Cs₃YCl₆ by structural modulation. By copper(I) alloying in Cs₃YCl₆, the delocalized excitons in [YCl₆]³⁻ octahedra convert to strongly localized excitons within [Cu₂(YCl₆)₃]⁷⁻ clusters in (Cs₈Cu)Y₃Cl₁₈, as confirmed by first-principles calculations. Temperature-dependent photoluminescence spectroscopy and kinetic results reveal a higher energy barrier for STE quenching in (Cs₈Cu)Y₃Cl₁₈ than in Cs₃YCl₆. Benefiting from the enhanced exciton confinement effect, (Cs₈Cu)Y₃Cl₁₈ exhibits a 460% enhancement in the STE-related scintillation yield. This work opens up a new strategy to enhance scintillation yield in LDHs under ionizing radiation excitation.