Phase-Selective Solution Synthesis of Cd-Based PerovskiteDerivatives and Their Structure/Emission Modulation

The rich phase structures of perovskite derivativeshave attracted extensive attention and can be applied in thefieldsof optoelectronics due to their high emission efficiency and tunableemission. Herein, we explored a phase-selective solution syntheticroute to obtain different Cd-based perovskite derivatives. First, thepristine tetragonal Cs7Cd3Br13was obtained by a solvothermalmethod, and its photoluminescence quantum yield (PLQY) wasboosted from 8.28% to 57.62% after appropriate Sb3+doping.Furthermore, halogen substitution was adopted to modifySb:Cs7Cd3Br13and produced a series of Cd-based perovskitederivatives with different crystal structures and tunable emissionfrom cyan to orange (517-625 nm). The mechanisms behind such experimental phenomena were further investigated and discussedon the basis of material characterization and theoretical computation. This study presented an effective strategy to synthesize brightCd-based perovskite derivatives with different structures and modulated emission, and it also provided insights to understand thestructure/emission modulation via halogen substitution.