Low lead migration 0D Cs4PbBr6 nanocrystal glass with super stability as a new member of the luminous family

In this study, by adjusting the cesium carbonate concentration and tuning the heat treatment temperature, zero dimensional (0D) Cs4PbBr6 perovskite nanocrystals (NCs) with different sizes were encapsulated into glass. The resultant Cs4PbBr6 NC glass exhibited strong green emission with a narrow full width at half maximum (FWHM, ~ 20 nm) and superior water resistance, which is a novel addition to the literature. In addition, Cs4PbBr6 NC glass exhibited a unique quantum behavior that could render it applicable in a novel type of optoelectronic device. Furthermore, a white-light-emitting diode (WLED) with color coordinates of (0.325, 0.331) and good long-term stability was successfully fabricated. The prepared Cs4PbBr6 NC glass also achieved up-conversion luminescence. Compared with CsPbX3 materials, the Cs4PbBr6 NC glass displayed unique optoelectronic properties that were attributed to the defect-induced emission, thereby advancing the study of these materials. •An ultra-stable zero-dimensional Cs4PbBr6 NC glass was prepared.•The NC size was tuned from 2.6 to 4.3 nm at heat treatment temperatures of 530–570 °C.•The thermostable glass exhibited a blue-shifted PL emission band, a narrow FWHM.•A high-performance WLED device was fabricated based on the Cs4PbBr6 NC glass.•The Cs4PbBr6 NC glass achieved up-conversion luminescence for the first time.