Novel, Green, and Scalable Aqueous Synthesis of Yellow–Green Emitting Cs₃Cu₂Cl₅ Scintillator and its Application in High‐Resolution TFT Panel for X‐Ray Imaging Detector

Abstract

Copper‐based metal halide scintillators have received increasing attention due to their high light yield and nontoxicity. However, the synthetic methods are still not feasible for actual commercialization for the difficulty in scaling up and the absence of green chemical footprint. Herein, we report a new, simple, aqueous synthetic method for the mass production of highly purified and crystallized Cs3Cu2Cl5 powder by a room‐temperature reaction between a saturated aqueous solution of CsCl and a saturated hydrochloric acid solution of CuCl. The product exhibits a photoluminence peak centering at 527 nm (FWHM = 106.7 nm) and a quantum yield (PLQY) of 97%. A prototype X‐ray imaging detector is fabricated by coupling a large area scintillation screen prepared by blade coating of Cs3Cu2Cl5 powder and a commercial thin‐film transistor (TFT) panel (16 cm × 13 cm, 125 µm pixel size) with readout circuit. The device exhibits a high spatial resolution of 4 lp mm−1, exceeding the theoretical limit of the TFT panel, and an excellent dynamic imaging ability. In short, this work demonstrates an efficient novel synthetic method of Cs3Cu2Cl5 and its application as X‐ray imaging device, providing an applicable solution for its future commercialization.

High-Quality Cs3Cu2I5@PMMA Scintillator Films Assisted by Multiprocessing for X-ray Imaging

“…The superb penetration ability of X-ray makes X-ray imaging widely used and developed in fields such as medical diagnosis, industrial non-destructive detection, safety inspection, and nuclear safety detection. − As an energy conversion layer in X-ray imaging systems, scintillators can effectively convert high-energy rays into visible light. − Common commercial scintillators are some inorganic solid single crystals, such as NaI: TI, CsI: TI, Bi 4 Ge 3 O 12 (BGO), CdWO 4 (CWO), etc. − However, there are problems such as high process costs, difficulties in large-size preparation, and poor moisture resistance. − Therefore, in recent years, a new generation of scintillatorsmetal halide materialsgradually has the potential to replace traditional scintillators, receiving more and more research and attention. − Among them, copper-based metal halide is one of the most widely studied lead-free metal halide scintillators due to its unique self-trapped exciton (STE) emission and performance advantages such as high photoluminescence quantum yield (PLQY), small self-absorption, and high X-ray absorption. − …”

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.…”

Dual-Mode Luminous Lead-Free Cs3Cu2Cl5 Perovskite Embedded in UiO-66-NDC Nanoparticles for Multilevel Anti-Counterfeiting

“…To address this issue, lead-free metals, like Bi 3+ , Sb 3+ , and Cu + , were used to replace Pb 2+ , and the substituted metal halide perovskites retained the excellent photovoltaic and photoelectric characteristics associated with the use of Pb, while significantly eliminating or minimizing toxicity concerns . Wherein Cs 3 Cu 2 Cl 5 NCs displayed bright green fluorescence and over 90% PLQY, , fluorescence quenching was also observed due to aggregation and external moisture . Organic ligands were employed in the synthesis of Cs 3 Cu 2 Cl 5 NCs, and they were prone to detachment during the postprocessing stage due to their low binding energies, which led to increases in crystal surface defects, further causing fluorescence quenching via aggregation .…”