Self-wavelength shifting in two-dimensional perovskite for sensitive and fast gamma-ray detection

Tong Jin, Zheng Liu, Jiajun Luo, Jun-Hui Yuan, Hanqi Wang, Zuoxiang Xie, Weicheng Pan, Haodi Wu, Kan-Hao Xue (), Linyue Liu, Zhanli Hu, Zhiping Zheng, Jiang Tang and Guangda Niu ()
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Tong Jin: Huazhong University of Science and Technology
Zheng Liu: Chinese Academy of Sciences
Jiajun Luo: Huazhong University of Science and Technology
Jun-Hui Yuan: Huazhong University of Science and Technology
Hanqi Wang: Huazhong University of Science and Technology
Zuoxiang Xie: Huazhong University of Science and Technology
Weicheng Pan: Huazhong University of Science and Technology
Haodi Wu: Huazhong University of Science and Technology
Kan-Hao Xue: Huazhong University of Science and Technology
Linyue Liu: Northwest Institute of Nuclear Technology
Zhanli Hu: Chinese Academy of Sciences
Zhiping Zheng: Huazhong University of Science and Technology
Jiang Tang: Huazhong University of Science and Technology
Guangda Niu: Huazhong University of Science and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Lead halide perovskites have recently emerged as promising X/γ-ray scintillators. However, the small Stokes shift of exciton luminescence in perovskite scintillators creates problems for the light extraction efficiency and severely impedes their applications in hard X/γ-ray detection. Dopants have been used to shift the emission wavelength, but the radioluminescence lifetime has also been unwantedly extended. Herein, we demonstrate the intrinsic strain in 2D perovskite crystals as a general phenomenon, which could be utilized as self-wavelength shifting to reduce the self-absorption effect without sacrificing the radiation response speed. Furthermore, we successfully demonstrated the first imaging reconstruction by perovskites for application of positron emission tomography. The coincidence time resolution for the optimized perovskite single crystals (4 × 4 × 0.8 mm3) reached 119 ± 3 ps. This work provides a new paradigm for suppressing the self-absorption effect in scintillators and may facilitate the application of perovskite scintillators in practical hard X/γ-ray detections.

Date: 2023
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DOI: 10.1038/s41467-023-38545-y

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