Non-Hygroscopic, Self-Absorption Free, and Efficient 1D CsCu₂I₃ Perovskite Single Crystal for Radiation Detection

Abstract

A novel all-inorganic CsCu2I3 single-crystalline perovskite as a nonhygroscopic and efficient X-ray and γ-ray scintillator is described herein. It is featured by a one-dimensional (1D) perovskite structure with an orthorhombic system and a space group of Cmcm. The CsCu2I3 crystal emits yellow light peaking at 570 nm originated from strongly localized 1D exciton emission. It appears self-absorption free because of the large Stokes shift of 1.54 eV. The photophysics process of the self-trapped exciton was studied using temperature dependent photoluminescene spectra and decay kinetics measurements. The CsCu2I3 crystal exhibits an extremely low afterglow level of 0.008% at 10 ms under X-ray excitation. Under 137Cs γ-ray irradiation, its light yield is 16 000 photons/MeV with an energy resolution of 7.8% at 662 keV.

Highly Resolved X‐Ray Imaging Enabled by In(I) Doped Perovskite‐Like Cs3Cu2I5 Single Crystal Scintillator

“…[13] For instance, Tang reported the ultrahigh LY (≈90 000 photo ns per MeV) of Rb 2 CuBr 3 scintillators with an emission peak at 385 nm. [14] Other copper halide scintillators have also been investigated, such as Rb 2 CuCl 3 , [15] CsCu 2 I 3 , [16] Cs 3 Cu 2 X 5 (X = Cl, I), and (TBA)CuX 2 (TBA = tetrabutylammonium cation; X = Cl, Br) [17] in the forms of single crystals (SCs) or polycrystalline. [18,19] However, one serious shortage for Rb 2 CuBr 3 scintillator is that the Rb element shows high natural radioactivity, which may hinder its practical application as scintillator.…”

“…Other copper halides, like CsCu 2 I 3 and Rb 2 CuCl 3 , display unsatisfied LY and/or relatively low γ-ray energy resolution. [15,16] Most recently, the scintillation performance of Cs 3 Cu 2 I 5 SCs grown by the Bridgman method has been explored, in which a high LY of 29 000 photons per MeV, an impressive γ-ray energy resolution of 3.4% was achieved. [20] Furthermore, the Cs 3 Cu 2 I 5 SCs show ultralow afterglow and remarkable air stability (non-hygroscopic).…”

Energy-resolving large area X-ray imaging enabled by stacked metal halide scintillators

“…Hence, it is highly desirable to develop energy-resolved FPXI detectors that combine high-performance, cost-effectiveness, and scalability. Recently, many metal halide [46][47][48][49][50][51][52] and perovskite [53][54][55][56][57] scintillators with the advantages of spectral tunability and facile preparation have been reported. On this basis, a multilayer stacked scintillator structure was designed and fabricated for large-area multi-energy FPXI.…”

CsCu2I3 Nanoribbons on Various Substrates for UV Photodetectors

“…13−23 Although Cu(I) halides possess large band gaps (∼3.49 to 4.51 eV), the photoluminescence (PL) or electroluminescence emissions can nearly span the whole visible-light region due to the significant self-trapped exciton (STE) emissions resulting from their soft lattice. 13,15,24,25 Furthermore, their exciton binding energy can be up to ∼560 meV owing to the strong intrinsic quantum confinement effects in the specific microstructures constructed with Cs + ions isolated from 0D/1D Cu(I) iodide photoactive sites. 26 Therefore, the PL quantum yield (PLQY) in single-crystal Cs 3 Cu 2 I 5 (0D) and CsCu 2 I 3 (1D) can be up to 90 and 50.4%, 16,27 respectively, which contributes to high-performance LEDs.…”