Low-dose real-time X-ray imaging with nontoxic double perovskite scintillators

Wenjuan Zhu; Wenbo Ma; Yirong Su; Zeng Chen; Xinya Chen; Yaoguang Ma; Lizhong Bai; Wenge Xiao; Tianyu Liu; Haiming Zhu; Xiaofeng Liu; Huafeng Liu; Xu Liu; Yang (Michael) Yang

doi:10.1038/s41377-020-00353-0

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Low-dose real-time X-ray imaging with nontoxic double perovskite scintillators

Original Articles

- Low-dose real-time X-ray imaging with nontoxic double perovskite scintillators
- Light: Science & Applications Vol. 9, Issue 4, Pages: 1103-1112(2020)
- Affiliations：
  
  1.State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, Zhejiang, China
  2.Center for Chemistry of High-Performance & Novel Materials, department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, China
- Author bio：
  
  Yang (Michael) Yang (yangyang15@zju.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-00353-0
  CLC：
- Published：2020，
  
  Published Online：30 June 2020，
  
  Received：06 March 2020，
  
  Revised：12 June 2020，
  
  Accepted：17 June 2020
- Accepted：
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Zhu, W. J. et al. Low-dose real-time X-ray imaging with nontoxic double perovskite scintillators. Light: Science & Applications, 9, 1103-1112 (2020).
DOI：

Zhu, W. J. et al. Low-dose real-time X-ray imaging with nontoxic double perovskite scintillators. Light: Science & Applications, 9, 1103-1112 (2020). DOI： 10.1038/s41377-020-00353-0.

摘要

Abstract

X-rays are widely used in probing inside information nondestructively

enabling broad applications in the medical radiography and electronic industries. X-ray imaging based on emerging lead halide perovskite scintillators has received extensive attention recently. However

the strong self-absorption

relatively low light yield and lead toxicity of these perovskites restrict their practical applications. Here

we report a series of nontoxic double-perovskite scintillators of Cs

0.6

0.4

1-y

. By controlling the content of the heavy atom Bi

the X-ray absorption coefficient

radiative emission efficiency

light yield and ligh

t decay were manipulated to maximise the scintillator performance. A light yield of up to 39

000 ± 7000 photons/MeV for Cs

0.6

0.4

0.85

0.15

was obtained

which is much higher than that for the previously reported lead halide perovskite colloidal CsPbBr

(21

000 photons/MeV). The large Stokes shift between the radioluminescence (RL) and absorption spectra benefiting from self-trapped excitons (STEs) led to a negligible self-absorption effect. Given the high light output and fast light decay of this scintillator

static X-ray imaging was attained under an extremely low dose of ~1 μGy

air

and dynamic X-ray imaging of finger bending without a ghosting effect was demonstrated under a low-dose rate of 47.2 μGy

air

−1

. After thermal treatment at 85 ℃ for 50 h followed by X-ray irradiation for 50 h in ambient air

the scintillator performance in terms of the RL intensity and X-ray image quality remained almost unchanged. Our results shed light on exploring highly competitive scintillators beyond the scope of lead halide perovskites

not only for avoiding toxicity but also for better performance.

关键词

Keywords

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