The paper presents the results of studying the region of glass formation in the B2O3-SiO2-ZnO-NaBr system. The used mode of glass synthesis made it possible to avoid the complete volatilization of bromine from the glass melt. For a series of samples containing 8 mol.% sodium bromide, 12 mol.% SiO2 and variable ratio of B2O3 and ZnO the dependences of density and refractive index were determined. For the glass composition 60B2O3 – 12SiO2 – 20ZnO – 8NaBr additionally containing PbBr and CsNO3, in-situ crystallization of halide perovskite crystals was performed. Based on X-ray phase analysis, the formation of the CsPbBr3 phase was established. Upon excitation at a wavelength of 405 nm, the glass-ceramic sample had a luminescence band with a maximum near a wavelength of 518 nm.