[3PS-027]
Mesoporous Water Trapping Strategy for Enhancing Stability and Luminescence via Sn²⁺ Oxidation Suppression under Ambient-Condition Synthesis of CsSn₁₋ₓPbₓBr₃ Quantum Dots
발표자박정완 (중앙대학교)
연구책임자왕동환 (중앙대학교)
Abstract
Perovskite quantum dots (PQDs) are mostly lead-based, but their toxicity limits practical applications. B-site mixing, such as partial substitution of Pb²⁺ by Sn²⁺ in CsSn₁₋ₓPbₓBr₃, enables lead reduction and optoelectronic tunability. However, Sn²⁺ oxidation by moisture, which causes lattice degradation, remains a major challenge to the structural and optical stability of tin-based PQDs. In this study, we propose a synthesis method for dehydrated and stable CsSn₁₋ₓPbₓBr₃ quantum dots via a mesoporous water trapping strategy. Molecular sieves with a pore size of 3 Å are employed to selectively adsorb and block water molecules based on molecular size. The addition of sieves to the polar solvent effectively removes residual H2O, resulting in the formation of dehydrated QDs. The dehydrated CsSn₁₋ₓPbₓBr₃ PQDs exhibit improved photoluminescence and enhanced structural stability, demonstrating superior performance under ambient conditions compared to pristine PQDs.