Moisture-Stable CsSnBr₃ Quantum Dots and SnO₂ Glass-Ceramics for Broadband White-Emitting Diodes

Abstract

Lead-free tin-based perovskite quantum dots (QDs) are considered the most promising alternatives to lead-based perovskites, but their potential application is hindered by poor stability. This issue was addressed by preparing amorphous glassprotected CsSnBr 3 QDs through meticulous optimization of the glass structure. Intriguingly, the self-crystallization of the CsSnBr 3 QDs occurred without needing heat treatment. We found that the CsSnBr 3 QDs glass-ceramic is composed of two phases, SnO 2 and CsSnBr 3 , of which SnO 2 is the main phase. At the same time, the tunability of the luminescence color can be achieved by changing the silicon−boron ratio and melting temperature in the glass matrix. Moreover, due to the complete encapsulation of the quantum dots by the glass matrix, the CsSnBr 3 QDs glass-ceramic exhibited remarkable stability and a high photoluminescence quantum efficiency (51.5%). Subsequently, the CsSnBr 3 QDs glassceramic was incorporated with an ultraviolet chip to produce a white light-emitting diode (WLED), and its potential application in plant growth was explored.