All inorganic perovskite quantum dots (QDs) have broad applications due to its unique photoelectric properties. At present, a large number of QDs embed glasses of three-dimensional (3-D) CsPbBr₃ cubic phase or zero dimensional (0-D) Cs₄PbBr₆ hexagonal phase have been reported, but the phase regulation between 0-D and 3-D has not been deeply studied only by the adjustment of the glass network topology. In this paper, Cs₄PbBr₆/CsPbBr₃ QDs were successfully synthesized in tellurite germanate glass by high-temperature melt-quenching combined with in-situ crystallization, and their luminescence properties, structures, and phase regulation fundamentals in glasses were investigated in depth. The introduction of P₂O₅ increases the ratio of [TeO₄]/[TeO₃] units in the tellurite germanate glasses, resulting in a more compact glass network and changing the growth environment of QDs. When the content of the nucleating agent P₂O₅ was increased to 3% (mass fraction), the crystalline phase of QDs realized the regulate from 0-D hexagonal phase to 3-D cubic phase. The regulation from Cs₄PbBr₆ to CsPbBr₃ is accompanied by a blue-shifted emission peak from 519 to 482 nm, and the synthesized QDs glasses all have good long-term stability. The QDs glasses obtained in the experiment has great potential in the application of white light emitting diodes.

第一作者：赵晓，沈帅龙

通讯作者：余丽萍

发表期刊：Journal of Luminescence

在线发表时间：2023-05-16

文章链接：https://www.sciencedirect.com/science/article/pii/S0022231323002429