Mg(II)-Doped Perovskite-like Cs 3 Cu 2 I 5 Single Crystals with High Quantum Yield for Efficient X-ray Detection

作者：Tong Wu, Yun Shi, Xuzhong Zuo, Mingyue Chen, Hongbing Ran, Shuwen Zhao, Junfeng Chen, Yiwen Tang · 发表于：Crystal Growth & Design · 年份：2025 · DOI：10.1021/acs.cgd.4c01452 · 被引用次数：9 · 研究领域：Perovskite Materials and Applications、Luminescence Properties of Advanced Materials、Radiation Detection and Scintillator Technologies

Cs 3 Cu 2 I 5 halide perovskites doped with luminescence activators have unique optical and electronic properties; however, they tend to combine with slow scintillation decay, which leads to ghosting or blurriness during X-ray imaging. In this study, we produced magnesium (Mg 2+ )-doped Cs 3 Cu 2 I 5 single crystals (SCs) with blue emission at 440 nm, and the photoluminescence quantum yields ranged from 72.4 to 81.7%. Moreover, enhanced radioluminescence (RL) intensity and light output were achieved without deteriorating scintillation decay compared to those of pure Cs 3 Cu 2 I 5 SCs. Mg doping can strengthen electron–phonon coupling, and the emission (2.15 eV) at a low temperature (80–290 K) showed the presence of additional carrier capture channels of Mg-related defect levels in the band gap, which can help reduce the probability of nonradiative recombination. Therefore, flexible X-ray scintillator films with excellent hydrophobicity were fabricated using Mg 2+ -doped Cs 3 Cu 2 I 5 SC powders, and their spatial resolution (2.5 Lp/mm) met the resolution requirements of commercial spiral computed tomography. This study found an effective strategy for enhancing the self-trapped exciton emission of metal copper-based halide scintillators and highlighted their applicability in low-dose flexible X-ray detection and imaging.