Thermoluminescence of Borate Glass Containing Copper

Abstract

Abstract Thermoluminescence (TL) of X ray irradiated borate glass containing copper (0.01 to 1.0 mol%) has been studied. Samples were made from mixtures of B2O3 and CuCl2. They were melted at 1100 oC for 1 hour in a platinum crucible followed by annealing in a brass mould. Samples were irradiated with various doses of X rays at room temperature. The samples containing CuCl2 showed a much stronger TL response than pure B2O3 glass. The kinetic orders for the TL peaks in CuCl2 doped samples were always about 1.5, while those in undoped glass obeyed 2nd order kinetics. The sample doped with 0.05 mol% CuCl2 had the strongest TL response. The TL emission spectra for samples containing CuCl2 showed a maximum at 2.77 eV (448 nm) for all temperatures during the TL measurements. The emission is possibly due to the recombination reaction: Cu+ + hole ® Cu2+* ® Cu2+ + h?. Thermally stimulated current (TSC) for X ray irradiated glass showed maxima in the temperature region 90 ~ 100 oC when a bias voltage was applied to the sample. The TSC is thought to be related to the TL.