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Nature. 2018 Sep;561(7721):88-93. doi: 10.1038/s41586-018-0451-1. Epub 2018 Aug 27.

All-inorganic perovskite nanocrystal scintillators.

Author information

1
Department of Chemistry, National University of Singapore, Singapore, Singapore.
2
School of Science, China University of Geosciences, Beijing, China.
3
MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fuzhou University, Fuzhou, China.
4
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou, China.
5
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China.
6
Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
7
Institute of Advanced Materials, Nanjing Tech University, Nanjing, China.
8
SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Shenzhen University, Shenzhen, China.
9
Singapore Institute for Neurotechnology, National University of Singapore, Singapore, Singapore.
10
Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA.
11
School of Materials Science and Engineering, University of New South Wales, Sydney, New South Wales, Australia.
12
Luminescent Materials Laboratory, DB, University of Verona, Verona, Italy.
13
MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fuzhou University, Fuzhou, China. hhyang@fzu.edu.cn.
14
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou, China. hhyang@fzu.edu.cn.
15
Institute of Advanced Materials, Nanjing Tech University, Nanjing, China. iamwhuang@nwpu.edu.cn.
16
Key Laboratory for Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications, Nanjing, China. iamwhuang@nwpu.edu.cn.
17
Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing, China. iamwhuang@nwpu.edu.cn.
18
Shaanxi Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, China. iamwhuang@nwpu.edu.cn.
19
Department of Chemistry, National University of Singapore, Singapore, Singapore. chmlx@nus.edu.sg.
20
SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Shenzhen University, Shenzhen, China. chmlx@nus.edu.sg.
21
Center for Functional Materials, NUS Suzhou Research Institute, Suzhou, Jiangsu, China. chmlx@nus.edu.sg.

Abstract

The rising demand for radiation detection materials in many applications has led to extensive research on scintillators1-3. The ability of a scintillator to absorb high-energy (kiloelectronvolt-scale) X-ray photons and convert the absorbed energy into low-energy visible photons is critical for applications in radiation exposure monitoring, security inspection, X-ray astronomy and medical radiography4,5. However, conventional scintillators are generally synthesized by crystallization at a high temperature and their radioluminescence is difficult to tune across the visible spectrum. Here we describe experimental investigations of a series of all-inorganic perovskite nanocrystals comprising caesium and lead atoms and their response to X-ray irradiation. These nanocrystal scintillators exhibit strong X-ray absorption and intense radioluminescence at visible wavelengths. Unlike bulk inorganic scintillators, these perovskite nanomaterials are solution-processable at a relatively low temperature and can generate X-ray-induced emissions that are easily tunable across the visible spectrum by tailoring the anionic component of colloidal precursors during their synthesis. These features allow the fabrication of flexible and highly sensitive X-ray detectors with a detection limit of 13 nanograys per second, which is about 400 times lower than typical medical imaging doses. We show that these colour-tunable perovskite nanocrystal scintillators can provide a convenient visualization tool for X-ray radiography, as the associated image can be directly recorded by standard digital cameras. We also demonstrate their direct integration with commercial flat-panel imagers and their utility in examining electronic circuit boards under low-dose X-ray illumination.

PMID:
30150772
DOI:
10.1038/s41586-018-0451-1

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