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

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%.

Crystallization of Cristobalite in Sodium Borosilicate Glass in the Presence of Cr2O3

“…Different valence states cause different coordinations of chromium ions with respect to oxygen, and, accordingly, their structural roles. The valence state of chromium ions determines the properties of such glasses, such as luminescence [ 11 , 12 , 13 , 14 ], semiconducting behavior [ 15 ], and magnetic properties [ 16 ]. These properties make it possible to consider glasses containing chromium as promising materials for use in various modern fields, such as laser technology, optoelectronic devices, and solar power engineering [ 9 ], in the tunable solid-state lasers that are used in telecommunication systems [ 17 , 18 , 19 , 20 ], electro-optical modulators, nonlinear optical and parametric converters, fiber optical amplifiers [ 21 , 22 ], for innovative luminescent resources [ 17 ], and in luminescent solar concentrators [ 23 , 24 , 25 ].…”

Fracture Surface Analysis, Physical, Optical and Dielectric Properties of Bismuth-Based Glass Doped with Potassium Chromate

“…The redox state of chromium ion provides specific light transmission properties of glasses. Green and yellow colors arise from Cr 3+ and Cr 6+ , respectively [7][8][9][10]. In this work, bismuth-based glasses with different doping concentrations of potassium chromate have been prepared.…”