Facile Synthesis of Efficient Blue-Light-Emitting Copper(I) Halide Hybrid Phosphors for Applications in pc-WLEDs and X-ray Imaging

• • Achieved a photoluminescence quantum yield (PLQY) of 70% in blue-emitting copper(I) halide hybrids synthesized via a rapid ultrasonic solution method, enabling energy-efficient solid-state lighting and high-sensitivity X-ray imaging. • • The synthesis uses inexpensive, commercially available tetraethylammonium halides (TEAX, X = Cl, Br, I), reducing material costs and simplifying production compared to conventional high-temperature, high-pressure methods for inorganic scintillators. • • The materials exhibit thermally activated delayed fluorescence (TADF), which enhances exciton harvesting and contributes to the high PLQY, crucial for achieving high radioluminescence efficiency in X-ray scintillators. • • The solution-based ultrasonic treatment enables rapid, scalable synthesis, addressing the bottleneck of complex preparation for hybrid copper(I) halides and facilitating their integration into flexible, large-area optoelectronic devices.