Optical and structural characterization of CsPb(I1-xBrx)3 nanomaterials prepared by the mechanochemical method

Hybrid organic-inorganic lead halide perovskites (LHP) are gaining considerable attention due to their wide range of potential applications, particularly as an active layer in solar cells and light-emitting devices owing to their excellent light-harvesting and photoluminescence emission properties. Considering their high color purity and color-tunability, high photoluminescence quantum yield (PLQY), easy fabrication, and cost-efficiency, LHP are promising candidates to compete with the traditional active layer in solid-state lighting. The PL emission of CsPbX3 (X = I, Br, Cl) covers the entire visible range from 400 to 730 nm and can be easily tuned via halide replacement in the I <-> Br <-> Cl series. In this work, photoluminescence (PL), luminescence excitation, UV/VIS/ NIR absorption, structural and morphological properties of CsPb(I1-xBrx)3 (x = 0-1) nanosized powders prepared by the mechanochemical synthesis method is investigated at 80K and room temperature. A narrow PL peak with full width at half maximum (FWHM) = 16.5 and 6.6 nm was observed at room temperature and 80K from CsPbBr3, respectively. The relation between structure and optical properties of nanopowders is discussed. It is shown that the halide exchange mechanism is an effective approach for fabrication of defect-free materials.

Automated summary

Hybrid organic-inorganic lead halide perovskites show excellent light-harvesting and photoluminescence emission properties, making them promising candidates for use in solar cells and light-emitting devices. This study investigates the photoluminescence and structural properties of CsPb(I1-xBrx)3 nanosized powders, demonstrating the effectiveness of halide exchange mechanism in fabricating defect-free materials.