Color adjustable CsPbX3 (X=Cl, Br, I) perovskite quantum dots germanate glass

CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have attracted extensive attention due to their great application prospects in the photoelectronic field. However, the poor long-term stability still limits their practical use. In this work, a whole series of CsPbX3 QDs were precipitated in a germanate glass matrix by a melt quenching method. The emission wavelength can be tunable in the entire visible spectral region by adjusting of the halide ions and the thermal treatment process. The photoluminescence quantum yield of CsPbBrxI3-x QDs glass can reach up to 38.24%. The exciton binding energies of CsPbBrxCl3-x, CsPbBr3 and CsPbI3 QDs glass are about 67 meV, 160 meV and 290 meV, respectively. Additionally, the influence of the thermal treatment temperature on photoluminescence properties of CsPbBrxI3-x QDs glass was investigated in detail. These results will be of benefitting to their practical applications, such as display devices and WLEDs.