Low-dimensional halide perovskites CsCuI have garnered increasing attention for their exceptional luminescent properties, attributed to their stability, high photoluminescence quantum yield (PLQY), and scintillation efficiency. Here, we report the growth of transparent CsCuI crystals via the Bridgman method, emphasizing precise control of melt stoichiometry for optimal performance. Through melt composition optimization, significant improvements in crystal clarity and structural integrity were achieved, enhancing transmittance from 30% to over 80% and achieving nearly 100% PLQY. Notably, it exhibited self-absorption-free behavior due to a large Stokes shift of 1.15 eV, indicative of a substantial exciton binding energy (383 meV) associated with exciton self-trapping. Lastly, under Am γ-ray irradiation at 59.5 keV, the energy resolution improved to 14.9% with the transparent CsCuI crystals, demonstrating its potential for high-performance scintillation applications.
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