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Thallium-Doping-Modulated Photon Emission and Scintillation Performance in Cs3Cu2I5 Nanocrystals
Xudong Hu1,2, Xiaojia Yuan1, Jialin Yang1
1MIIT Key Laboratory of Advanced Display Materials and Devices, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Nano Letters
|June 18, 2025
Summary
Thallium-doped cesium copper iodide (Cs3Cu2I5) nanocrystals offer enhanced X-ray imaging. This study reveals that Tl doping improves radioluminescence efficiency and enables ghost-free, high-speed X-ray imaging.
Area of Science:
- Materials Science
- Solid-State Physics
- Photonics
Background:
- Fast and low-dose X-ray imaging is critical for medical and security fields.
- Tl-doped Cs3Cu2I5 is a promising scintillator material for dynamic X-ray imaging, but doping mechanisms are unclear.
- Understanding these mechanisms is key to optimizing scintillator performance.
Purpose of the Study:
- To elucidate the photon emission mechanism in Tl-doped Cs3Cu2I5 nanocrystals.
- To investigate how Tl doping enhances scintillation properties.
- To provide insights for developing superior dopant-triggered scintillators.
Main Methods:
- Photoluminescence (PL) and radioluminescence (RL) spectroscopy.
- Femtosecond pump-probe laser spectroscopy.
- Time-dependent density functional theory (TD-DFT) calculations.
Main Results:
- Enhanced RL efficiency attributed to Jahn-Teller-type radiative recombination in [TlI8] polyhedrons.
- Suppression of nonradiative recombination due to balanced electron-phonon coupling between [Cu2I5] and [TlI8] polyhedrons.
- Demonstrated ghost-free X-ray imaging at 480 frames per second with 30.4 lp/mm resolution.
Conclusions:
- The study clarifies the scintillation enhancement mechanism in Tl-doped Cs3Cu2I5.
- Balanced electron-phonon coupling and specific polyhedral structures are crucial for high efficiency.
- This work paves the way for advanced, high-performance X-ray scintillators.
