CsPbBr3/Cs4PbBr6 Quantum Dots in Rigid Lithium Disilicate Glass Ceramics for Lighting and Displays

Zero-dimensional quantum dots (QDs) with formulas of Cs4PbX6 and CsPbX3 (X = I, Br, Cl) have emerged in recent years for next-generation functional materials in optoelectronics fields. However, CsPbX3 and Cs4PbX6 QDs are unstable when separated from colloidal solution, still less enduring thermal and water attack. Herein, lithium disilicate glass ceramics, a fantastic dental restorative material with excellent mechanical properties and good semitransparency, have been used as the rigid armor to keep CsPbBr3/Cs4PbBr6 QDs away from destructive environmental influences. Notably, lithium disilicate glass ceramics can effectively prevent the aggregation and further growth of QDs even at a high calcination temperature (600 °C), while the average particle sizes of the QDs in lithium disilicate glass ceramic are only ∼3.3 nm. The CsPbBr3/Cs4PbBr6 quantum dot glass microcrystalline prepared at 600 °C exhibits intense green emission at ∼520 nm with a greatly enhanced emission intensity of ∼5.1 times that of the sample prepared at 500 °C. Interestingly, the abnormal luminescence enhancement (∼195%) appeared after the as-prepared CsPbBr3/Cs4PbBr6 quantum dot glass microcrystalline was immersed in water for 72 h. The ultrastable CsPbBr3/Cs4PbBr6 QDs glass microcrystalline exhibits great potential in lighting and displays fields similar to traditional inorganic phosphors.