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Blue and green light emitting CsPbBr 3 and CsPb(Cl/Br) 3 perovskite quantum dots glasses (QDGs) have been fabricated in multi-component borate glass matrices by melt quenching method and following heat treatment. Absorption spectra show regular blue shift of first exciton absorption peak from CsPbBr 3 to CsPb(Cl/Br) 3 QDGs. Photoluminescence spectra show that CsPbBr 3 and CsPb(Cl/Br) 3 QDGs have adjustable emission in the wavelengths from 528 to 442 nm. The full width at half maximum (FWHM) is 15–17 nm and 21–31 nm for CsPbBr 3 and CsPb(Cl/Br) 3 QDGs respectively. Emission map and photoluminescence excitation spectra show broad band excitation characteristics of the exciton emission. Photoluminescence decay shows bi-exponential function for both CsPbBr 3 and CsPb(Cl/Br) 3 QDGs. As the ratio of Cl/Br increases from CsPbBr 3 to CsPb(Cl/Br) 3 QDGs, the short and long lifetime components roughly decrease from 9.7 to 4.0 ns and from 87.8 to 55.2 ns respectively, and the average lifetime decreases from 72.2 to 36.5 ns. Photoluminescence quantum yield changes from 82.8% to 5.7%. Temperature dependence of PL spectra in the range of 28–120 °C shows that integrated intensity obviously decreases with increasing temperature, but the emission peak wavelength and FWHM almost do not change. • Absorption spectra show blue-shift for CsPbBr 3 and CsPb(Cl/Br) 3 QDGs with different Cl/Br ratios. • Photoluminescence spectra show blue shift from 528 to 442 nm for CsPbBr 3 and CsPb(Cl/Br) 3 QDGs. • Narrow FWHM is 15–17 nm and 21–31 nm for CsPbBr 3 and CsPb(Cl/Br) 3 QDGs respectively. • With increasing Cl/Br ratio, short lifetime component and PLQY decrease with the same rule. • With increasing temperature, integrated intensity decreases, but emission peak and FWHM do not change. [ABSTRACT FROM AUTHOR]