Scintillator of Polycrystalline Perovskites for High‐Sensitivity Detection of Charged‐Particle Radiations

Abstract

Herein, the first study on the scintillation properties of CsCu 2 X 3 and Cs 3 Cu 2 X 5 (where X: Cl − , Br − , I − ) is presented, describing their charged particle-induced luminescence involving electrons, protons, α-particles, and heavy ions, as well as revealing their capabilities on the timing and spectroscopic evaluation of single-particle events. The thin layers are prepared with a simple and costeffective deposition procedure, without the incorporation of external dopants, exploiting the intrinsic radiative recombination observed in low-dimensional perovskites. The combined effect of the high binding energy and localized stability of self-trapped excitons, large Stokes shift, defect tolerance, and the high excitation density along the particle track leads to the emergence of boosted scintillation pulses. The observations demonstrate the first use of inorganic thin-film scintillators with optical pulse characteristics and light yield competitive with doped single crystal scintillators, while also providing improved structural and functional stability under extreme environmental conditions.

Transparent glassy composites incorporating lead-free anti-perovskite halide nanocrystals enable tunable emission and ultrastable X-ray imaging

“… – 8 However, they are restricted in the scintillation field due to the toxicity of heavy metal Pb, low photon yield caused by severe self-absorption effect, and poor X-ray irradiation stability 9 , 10 . In order to solve the above problems, many types of lead-free zero-dimensional (0D) metal halides, 11 such as Cu-based halides, 12 – 14 Ag-based halides, 15 Zr-based halides, 16 and Mn-based halides, 17 , 18 have been developed as effective scintillators for X-ray detection and imaging on account of their high photon yield, diversity of composition and structure, and unique self-trapped excitons luminescence mechanism. Nevertheless, most of them are fabricated in thin-film form or wafers for X-ray imaging, 11 which usually demonstrate low imaging resolution due to the light scattering by the large particles and crystal boundary 9 .…”

Density-discriminating chromatic x-ray imaging based on metal halide nanocrystal scintillators

“…X-ray imaging is a versatile method in many detection fields due to the extreme penetration ability of high-energy particles. Tremendous efforts have led to dramatic developments in x-ray imaging, including nondestructive safety inspection, medical research, and other fields over the past years (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). In typical x-ray imaging, the original imaging result is enhanced by the antilogarithm process of gray value.…”

Cs3Cu2I5 Nanocrystals with Near-Unity Photoluminescence Quantum Yield for Stable and High-Spatial-Resolution X-ray Imaging

“…Among them, Cs 3 Cu 2 I 5 has been favored by many researchers because of its great scintillation properties, high defect tolerance, and robust processability. − A variety of effective methods have been developed to prepare Cs 3 Cu 2 I 5 scintillators, such as the melting method , or solution method , to grow large single crystals and the hot-injection method or anti-solvent method to synthesize nanocrystals. Moreover, the spray-coating procedure and dual-source co-evaporated method can also be used to prepare large-size Cs 3 Cu 2 I 5 films. In addition, there are various methods to enhance the scintillation performance and X-ray imaging resolution of a Cs 3 Cu 2 I 5 scintillator, such as sophisticated doping strategies , and embedding Cs 3 Cu 2 I 5 melt into an anodic aluminum oxide (AAO) matrix to fabricate high-resolution pixelated scintillator film .…”