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

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 glass-protected CsSnBr3 QDs through meticulous optimization of the glass structure. Intriguingly, the self-crystallization of the CsSnBr3 QDs occurred without needing heat treatment. We found that the CsSnBr3 QDs glass-ceramic is composed of two phases, SnO2 and CsSnBr3, of which SnO2 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 CsSnBr3 QDs glass-ceramic exhibited remarkable stability and a high photoluminescence quantum efficiency (51.5%). Subsequently, the CsSnBr3 QDs glass-ceramic was incorporated with an ultraviolet chip to produce a white light-emitting diode (WLED), and its potential application in plant growth was explored.