Achieving A Record Scintillation Performance by Micro-Doping Heterovalent Magnetic Ion in Cs 3 Cu 2 I 5 Single-Crystal.

Ultra-bright, ultra-fast, and low-cost ideal scintillator has been critically absent and sorely desired in scintillation detection and has hitherto not been found. Here, we report a high-quality bulk Cs 3 Cu 2 I 5 :Mn single-crystal scintillator with ultra-high light yield (∼95,772 photons/MeV, 137 Cs γ-ray), excellent energy resolution (3.79%, 662 KeV), and ultra-fast scintillation decay time (3 ns, 81.5%). In mechanism, we find that the micro-doping of heterovalent magnetic ions (at the ppm level) can effectively modulate the luminescence kinetics of self-capture excitons in the scintillator. Compared with previous reports, the introduction of trace amounts of magnetic Mn 2+ (∼18.6 ppm) in Cs 3 Cu 2 I 5 single-crystal shortens the scintillation decay time by several hundred times, transforming slow decay into ultra-fast decay. Simultaneously, the light yield is also increased about three times to the highest value so far. From the comprehensive performance of the micro-doped Cs 3 Cu 2 I 5 :Mn single-crystal, these excellent scintillation properties, physical characteristics suitable for practical applications, and low-cost advantages render this single-crystal an ideal scintillator with great potential for commercialization. This article is protected by copyright. All rights reserved.