Centimeter-sized Cs3Cu2I5 Single Crystal: Synthesized by Low-cost Solution Method and Optical and Scintillation Properties

doi:10.15541/jim20220028

Abstract

Abstract:

In recent years, low-dimensional metal halide perovskites/quasi-perovskites with high photoluminescence quantum yield have shown potential application prospects in nuclear radiation detection. In this paper, centimeter- sized zero-dimensional perovskite Cs₃Cu₂I₅ single crystals with high optical quality was grown by the anti solvent diffusion method. The optical absorption, transmittance photoluminescence excitation (PLE) and emission (PL), time-resolved photoluminescence, X-ray excited radioluminescence (XEL), afterglow, thermoluminescence (TL) and γ-ray detection performance of Cs₃Cu₂I₅ single crystals were comprehensively investigated. The optical bandgap of as-prepared Cs₃Cu₂I₅ single crystals is 3.68 eV. Under the excitation of X-ray, Cs₃Cu₂I₅single crystals show blue emission peaking at 448 nm originated from self-trapped exciton emission, and the principal scintillation decay time is 947 ns (96%). The afterglow level of Cs₃Cu₂I₅ single crystals is comparable to that of commercial BGO crystal. In addition, Cs₃Cu₂I₅single crystals exhibit a high light yield of 29000 photons/MeV as γ-ray scintillators, and their scintillation properties are comparable to that of Cs₃Cu₂I₅ single crystals prepared by the melt growth method. Therefore, this work demonstrates the feasibility of low-cost crystal growth of high-performance Cs₃Cu₂I₅ single crystals.

Key words: zero-dimensional perovskites, scintillators, Cs₃Cu₂I₅ single crystal, anti-solvent diffusion method, Bridgman method

CLC Number:

O782

XU Tingting, LI Yunyun, WANG Qian, WANG Jingkang, REN Guohao, SUN Dazhi, WU Yuntao. Centimeter-sized Cs₃Cu₂I₅ Single Crystal: Synthesized by Low-cost Solution Method and Optical and Scintillation Properties[J]. Journal of Inorganic Materials, 2022, 37(10): 1129-1134.

Figures/Tables 4

Fig. 1 Schematic diagram of Cs3Cu2I5 crystal grown by anti, solvent diffusion method

Fig. 2 Photographs and structures of Cs3Cu2I5 crystals (a-b) Photographs of millimeter-sized rod-like Cs3Cu2I5 crystals and centimeter-sized bulk Cs3Cu2I5 crystals grown by solution method under sunlight and 254 nm ultraviolet light; (c) Photographs of Cs3Cu2I5 crystals grown by solution method for comparative study; (d) Photographs of Cs3Cu2I5 crystals grown by melt method for comparative study; (e) Structure of [Cu2I5]3- where blue and purple spheres represent Cu and I atoms, respectively; (f) X-ray powder diffraction (XRD) pattern of crystals grown by solution method

Fig. 3 Optical properties of Cs3Cu2I5 crystals (a) Absorption spectra of Cs3Cu2I5 crystals grown by solution method; (b) Transmittance spectra of Cs3Cu2I5 crystals grown by solution method; (c) Photoluminescence excitation (PLE) and emission (PL) spectra of Cs3Cu2I5 crystals grown by solution method; (d) PL and PLE contour mappings of Cs3Cu2I5 crystals grown by solution method; (e) Photoluminescence decay profiles of Cs3Cu2I5 crystals grown by solution method when λex=308 nm and λem=448 nm excited by nanoLED

Fig. 4 Scintillation properties of Cs3Cu2I5 crystals (a) X-ray excited RL spectra of Cs3Cu2I5 crystals grown by solution method and melt method with BGO as reference sample; (b) X-ray afterglow curves of Cs3Cu2I5 grown by solution method and melt method compared with that of BGO and CsI:Tl; (c) Thermoluminescence glow curves of Cs3Cu2I5 grown by solution method and melt method compared with that of CsI:Tl; (d) Pulse height spectra of Cs3Cu2I5 grown by solution method and melt method under 137Cs gamma-ray radiation as well as that of BGO; (e) Scintillation decay profiles of Cs3Cu2I5 grown by solution method and melt method under 137Cs gamma-ray radiation===Colorful figures are available on website

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Centimeter-sized Cs₃Cu₂I₅ Single Crystal: Synthesized by Low-cost Solution Method and Optical and Scintillation Properties

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