posted on 2023-10-12, 06:29authored byCong He, Chunwen Ye, Meng Wu, Shiwei Yang, Herui Zhao, Yiping Wu, Yanjie Zhang
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.