Ultrahigh-quality large single crystal preparation using the modified seed crystal-induced crystallization method with precision-controlled temperature gradient

Inorganic perovskites, particularly Cs4PbBr6, possess great potential applications for radiation detection, photonic and optoelectronic devices due to their peculiar yet robust photoluminescence properties and spectral color purity. Herein, a facile and industrial route to synthesize centimeter-size (1.2 × 1.1 × 0.8 cm3) Cs4PbBr6 single crystals was developed by modified seed crystal induced the precision-controlled temperature-gradient crystallization method. The effects of the temperature and supersaturation on growth, nucleation kinetics of large Cs4PbBr6 single crystals have been investigated. Our findings will provide a new strategy for the fabrication of large perovskite-related single crystals and could further strengthen their competitiveness for the field of lighting or display.