Lead-halide Cs4PbBr6 single crystals for high-sensitivity radiation detection

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.

Scintillation Response Enhancement in Nanocrystalline Lead Halide Perovskite Thin Films on Scintillating Wafers

“…However, their properties such as fast decay times, narrow emission bands, and high light yield are also desirable for scintillation detectors. Some papers have been published on this topic [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ], but not nearly as many.…”

Origin of Radioluminescence in Low-Dimensional Halide Perovskite Glass Ceramics under X-ray Excitation

“…is employed to present the relationship between the mass attenuation coefficient of CsI, CsPbBr 3 , Cs 4 PbBr 6 , Bi 4 Ge 3 O 12 (BGO), and the photon energy of X-ray, which was obtained from the XCOM database. 22 To further explore the stability of the Cs 4 PbBr 6 glass ceramic under long-time Xray irradiation, a series of contrast experiments were carried out. The Cs 4 PbBr 6 glass ceramic samples (15 days) were irradiated under 50 keV X-rays for different times, and their RL luminescence was also recorded in RL spectra.…”

“…9,20,21 For example, Ouyang's team synthesized centimeter-sized lead-halide Cs 4 PbBr 6 single crystals by solution processing and found that Cs 4 PbBr 6 single crystals exhibited not only a high photoluminescence quantum yield (PLQY) but also strong green emission under X-ray excitation. 22 In 2019, CsPbBr 3 @ Cs 4 PbBr 6 powder was synthesized via a recrystallization method by Zeng's team, and a large-area CsPbBr 3 @Cs 4 PbBr 6 film (360 mm × 240 mm) fabricated by a blade-coating technique imaging screen showed high-quality X-ray imaging. 21 However, to date, most of the reported scintillator materials based on halide perovskites are all prepared from the single crystal or powder with high crystallinity, but the stability under long-term X-ray irradiation still needs to be further improved.…”

“…Recently, halide perovskite materials and their derivatives have been demonstrated to be a kind of high quality and inexpensive X-ray scintillator with high performance for optoelectronic applications. − In the whole cesium lead bromide family, zero-dimensional Cs 4 PbBr 6 QDs have attracted much attention due to their unique electronic dimension and structure. − Additionally, Cs 4 PbBr 6 QDs also have high photoluminescence quantum yield and good stability. − Therefore, they have been developed as a potential material for X-ray detection. ,, For example, Ouyang’s team synthesized centimeter-sized lead-halide Cs 4 PbBr 6 single crystals by solution processing and found that Cs 4 PbBr 6 single crystals exhibited not only a high photoluminescence quantum yield (PLQY) but also strong green emission under X-ray excitation . In 2019, CsPbBr 3 @Cs 4 PbBr 6 powder was synthesized via a recrystallization method by Zeng’s team, and a large-area CsPbBr 3 @Cs 4 PbBr 6 film (360 mm × 240 mm) fabricated by a blade-coating technique imaging screen showed high-quality X-ray imaging .…”

Positive Effects of a Perovskite Film on the Radioluminescence Properties of a ZnO:Ga Crystal Scintillator

“…As scintillator materials, perovskites effectively absorb light in a wide range from the ultraviolet to the visible and near-infrared region [7] and yield light of various wavelengths. In previous works [8,9], the absorption efficiency of lead halide perovskites for 250 nm to 450 nm light was over 97%. The wavelengths of the output light were 90% concentrated in the range from 500 nm to 570 nm.…”