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Sensors and Materials, Volume 36, Number 2(2) (2024)
Copyright(C) MYU K.K.
pp. 523-530
S&M3540 Research Paper of Special Issue
Published: February 20, 2024

Scintillation Properties of Rb2Cu(Cl,Br)3 Crystals [PDF]

Keishi Yamabayashi, Kai Okazaki, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, and Takayuki Yanagida

(Received October 6, 2023; Accepted January 16, 2024)

Keywords: γ-ray detection, phosphor, Hume-Rothery rules, self-trapped excitons, slow cooling method, one-dimensional structure

Rb2Cu(Cl,Br)3 crystals were synthesized by the slow cooling method and their photoluminescence (PL) and scintillation properties were evaluated. PL emission peaks at 390 nm due to the recombination of excitons were observed, and the PL quantum yields of Rb2CuCl3, Rb2Cu(Cl0.5,Br0.5)3, and Rb2CuBr3 were 91.2, 95.3, and 96.3%, respectively. PL decay curves were approximated using a single exponential function model, and the obtained decay time constants were 15–66 μs. Under X-ray irradiation, the scintillation emission peaks of the samples were observed at 390 nm, and the decay times were 11–63 μs. The afterglow levels at 20 ms after X-ray irradiation were calculated to be 30–450 ppm. Rb2CuCl3 showed the highest scintillation light yield of 11000 photons/MeV among the samples when calculated from the pulse height spectra of 137Cs γ-rays (662 keV).

Corresponding author: Keishi Yamabayashi

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Cite this article
Keishi Yamabayashi, Kai Okazaki, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, and Takayuki Yanagida, Scintillation Properties of Rb2Cu(Cl,Br)3 Crystals, Sens. Mater., Vol. 36, No. 2, 2024, p. 523-530.

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