Crystallization kinetics and luminescent properties of chromium-doped borate glass-ceramics

Abstract

Abstract Chromium-doped alkali alumina borate glass was synthesized. The DSC studies exhibited glass transition temperature to be 425°C and glass crystallization temperature to locate in the 600 – 700°C range. After isothermal treatment of glass samples at temperatures from 540 to 700°C the chromium-doped borate glass-ceramics was obtained. The two bands of the glass absorption spectra shifted towards small wavelength region after the heat treatment with changing the glass colour. The XRD studies revealed the LiAl7B4O17: Cr3+ nanocrystals nucleation with the mean size of 12 – 25 nm. The glass-ceramics photoluminescence spectra possessed three intense bands in the 685 – 715 nm spectral region indicating high symmetrical environment around the chromium ions. The maximum value of the quantum yield was obtained after the heat treatment at 700°C was 50%.