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Lead-halide Cs4PbBr6 single crystals for high-sensitivity radiation detection
Low-dimensional perovskite materials and their derivatives with excellent optical performance are promising candidates for light-emission applications. Herein, centimeter lead-halide Cs 4 PbBr 6 single crystals (SCs), which have been used for radiation detection with the indirect conversion method,...
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Published in: | NPG Asia materials 2021-04, Vol.13 (1), Article 40 |
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Main Authors: | , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Low-dimensional perovskite materials and their derivatives with excellent optical performance are promising candidates for light-emission applications. Herein, centimeter lead-halide Cs
4
PbBr
6
single crystals (SCs), which have been used for radiation detection with the indirect conversion method, were synthesized by a facile solution process. The Cs
4
PbBr
6
scintillator exhibits bright green emission peaking at 525 nm and a high photoluminescence quantum yield (up to 86.7%) under 375 nm laser excitation. The Cs
4
PbBr
6
SCs exhibit high sensitivity to 40 keV X-rays, with a favorable linearity with the X-ray exposure dose rate, and the detection limit is as low as 64.4 nGy
air
/s. The scintillation time-response performance of the Cs
4
PbBr
6
SCs was acquired by a time-correlated single-photon counting system under alpha-particle excitation. The Cs
4
PbBr
6
SCs exhibit a very fast time response (
τ
av
= 1.46 ns) to alpha particles from a
241
Am radiation source. This value is comparable to that of the commercial plastic scintillator EJ-228 (
τ
av
= 1.31 ns) and much faster than that of the LYSO(Ce) scintillator (
τ
av
= 36.17 ns). Conceptual X-ray imaging and alpha-particle pulse height spectroscopy experiments were also performed. These results demonstrated the potential of Cs
4
PbBr
6
SCs for radiation detection applications, including X-ray imaging and charged particle detection with fast scintillation decay time and high sensitivity.
Medical imaging: Scintillating crystals reduce radiation risks
An improved technique for producing scintillators, materials that light up in the presence of ionizing radiation, shows promise for low-dose X-ray imaging applications. Commercial scintillators typically need to be fabricated through a series of high-temperature purification steps to become sufficiently sensitive to radiation. Qiang Xu and Xiaoping Ouyang from the Nanjing University of Aeronautics and Astronautics in China and co-workers now demonstrate that cesium–lead–bromide scintillators with ideal single-crystal structures can be synthesized through an inexpensive process involving the slow cooling of liquefied precursors. The team’s experiments revealed that these crystals could be produced at centimeter scales with favorable characteristics for radiation detection, including nanosecond-quick response times. Clear X-ray images were obtained at dosages much lower than those in standard chest computed tomography (CT) scans.
We investigated the scintill |
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ISSN: | 1884-4049 1884-4057 |
DOI: | 10.1038/s41427-021-00308-w |