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- Title
Lead-halide Cs<sub>4</sub>PbBr<sub>6</sub> single crystals for high-sensitivity radiation detection.
- Authors
Li, Yang; Shao, Wenyi; Chen, Liang; Wang, Juan; Nie, Jing; Zhang, Hang; Zhang, Silong; Gao, Runlong; Ouyang, Xiao; Ouyang, Xiaoping; Xu, Qiang
- Abstract
Low-dimensional perovskite materials and their derivatives with excellent optical performance are promising candidates for light-emission applications. Herein, centimeter lead-halide Cs4PbBr6 single crystals (SCs), which have been used for radiation detection with the indirect conversion method, were synthesized by a facile solution process. The Cs4PbBr6 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 Cs4PbBr6 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 nGyair/s. The scintillation time-response performance of the Cs4PbBr6 SCs was acquired by a time-correlated single-photon counting system under alpha-particle excitation. The Cs4PbBr6 SCs exhibit a very fast time response (τav = 1.46 ns) to alpha particles from a 241Am radiation source. This value is comparable to that of the commercial plastic scintillator EJ-228 (τav = 1.31 ns) and much faster than that of the LYSO(Ce) scintillator (τav = 36.17 ns). Conceptual X-ray imaging and alpha-particle pulse height spectroscopy experiments were also performed. These results demonstrated the potential of Cs4PbBr6 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 scintillation performance of centimeter lead-halide Cs4PbBr6 single crystal synthesized by a facile solution process. Cs4PbBr6 single crystal have been demonstrated with fast scintillation decay time, low detection limit, and without hygroscopic, which makes it ideal for indirection radiation detection applications. The alpha pulse height spectroscopy deconvoluted into two Gaussian functions were obtained. The clear X-ray imaging of a standard pattern plate with 600 μm interval width under a low dose rate below 3.3 μGyair/s was collected. All these results indicate that this low-cost Cs4PbBr6 SCs scintillator is expected to be a promising low-dose X-ray imaging material.
- Subjects
CHINA; PHOTON counting; SINGLE crystals; SCINTILLATORS; ALPHA rays; RADIATION; X-ray imaging; IONIZING radiation; EXPOSURE dose
- Publication
NPG Asia Materials, 2021, Vol 12, Issue 1, p1
- ISSN
1884-4049
- Publication type
Article
- DOI
10.1038/s41427-021-00308-w