TL, OSL and ESR properties of nanostructured KAlSi3O8:Mn Glass

Glass samples of KAlSi3O8:Mn were synthesized by sol-gel technique and the incorporation effects of Mn on the TL, OSL and ESR signals were studied. Its morphologies were analyzed through Transmission Electron Microscopy (TEM), Energy Dispersive Spectroscopy (EDS). Samples were obtained with five different molar concentrations of 0.25, 0.5, 1, 2 and 5 mol% of Mn. TEM micrographs indicated the occurrence of nanoparticles of Mn2SiO4 with 200 nm of size approximately. Results of TL spectra showed a broad emission band from 450 to 700 nm with a peak at 575 nm approximately, and fitting very well with the characteristic lines of the Mn2+ emission features. The OSL decay can be fitted by a sum of two exponentials. A proportional dose response curves of the OSL and TL for samples irradiated with γ-rays were verified. ESR results supplied six lines related to Mn2+ ions are observed superposed by a large isotropic line; the Hamiltonian components of these lines determined through simulation are I = 5/2, s = 5/2, g = 2.0060, A = 8.3 mT and s = 1/2, g = 2.0007 for the Mn2+ and isotropic lines.