HCOO- Doping-Induced Multiexciton Emissions in Cs3Cu2I5 Crystals for Efficient X-Ray Scintillation

Zisheng Wang; Lixiang Wang; Jiahao Xie; Yang Yang; Yilong Song; Guanjun Xiao; Yuhao Fu; Lijun Zhang; Yanjun Fang; Deren Yang; Qingfeng Dong

doi:10.1002/smll.202309922

HCOO^- Doping-Induced Multiexciton Emissions in Cs₃Cu₂I₅ Crystals for Efficient X-Ray Scintillation

Small. 2024 Apr 9:e2309922. doi: 10.1002/smll.202309922. Online ahead of print.

Authors

Zisheng Wang¹, Lixiang Wang², Jiahao Xie³, Yang Yang¹, Yilong Song¹, Guanjun Xiao⁴, Yuhao Fu⁴, Lijun Zhang³, Yanjun Fang^{2

5}, Deren Yang², Qingfeng Dong¹

Affiliations

¹ State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
² State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
³ State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, Changchun, 130012, China.
⁴ State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
⁵ Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, China.

PMID: 38593357
DOI: 10.1002/smll.202309922

Abstract

Self-trapped exciton (STE) luminescence, typically associated with structural deformation of excited states, has attracted significant attention in metal halide materials recently. However, the mechanism of multiexciton STE emissions in certain metal halide crystals remains largely unexplored. This study investigates dual luminescence emissions in HCOO^- doped Cs₃Cu₂I₅ single crystals using transient and steady-state spectroscopy. The dual emissions are attributed to intrinsic STE luminescence originating from the host lattice and extrinsic STE luminescence induced by external dopants, respectively, each of which can be triggered independently at distinct energy levels. Theoretical calculations reveal that multiexciton emission originates from structural distortion of the host and dopant STEs within the 0D lattice in their respective excited states. By meticulously tuning the excitation wavelength and selectively exciting different STEs, the dynamic alteration of color change in Cs₃Cu₂I₅:HCOO^- crystals is demonstrated. Ultimately, owing to an extraordinarily high photoluminescence quantum yield (99.01%) and a diminished degree of self-absorption in Cs₃Cu₂I₅:HCOO^- crystals, they exhibit remarkable X-ray scintillation characteristics with light yield being improved by 5.4 times as compared to that of pristine Cs₃Cu₂I₅ crystals, opening up exciting avenues for achieving low-dose X-ray detection and imaging.

Keywords: Cs3Cu2I5 perovskites; Cs3Cu2I5 single crystals; HCOO− doping; X‐ray detectors; perovskite single crystals.

Abstract

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