Solution growth of CsPbBrxI3-x bulk crystals and their optical and X-ray detection properties

In this study, the δ-phase CsPbBr x I 3-x single crystals (SCs) exhibiting notable environmental stability were investigated for the first time. Bulk crystals in centimeter-scale were successfully grown using the solution method, with EDS results confirming the chemical formula as CsPbBr 0.6 I 2.4 . The CsPbBr x I 3-x crystals demonstrate strong absorption at wavelengths less than 475 nm, with a calculated optical bandgap of 2.55 eV. Notably, the crystals also exhibit a broad emission band with a full width at half maximum (FWHM) of 247 nm, suggesting potential applications in optically driven white light emitting diodes (WLEDs). Additionally, the X-ray detection properties were characterized. All results indicate that CsPbBr x I 3-x crystals hold significant potential to harness their stability for practical applications, particularly in fields such as WLEDs, photovoltaics , and X-ray detectors.