New analytical expressions derived from the localized transition model for luminescence stimulation modes of TL and LM-OSL and their applications in computerized curve deconvolution

Localized transitions within the forbidden energy band have been used to describe a variety of luminescence behaviors for a wide range of materials. In this work, transformed analytical expressions based on the localized one trap one recombination-center (OTOR) model are derived to describe thermoluminescence (TL) glow peaks and linearly-modulated optically stimulated luminescence (LM-OSL) components. These expressions contain two geometric parameters describing the location of a peak/component that can be estimated directly from the curve. The deviations of activation energies determined using the TL expression are within 1% for peaks of various kinetic orders and the deviations of decay rates determined using the LM-OSL expression are within 4% for components with systematic factors smaller than 0.6. It demonstrates that these expressions can precisely fit measured TL/LM-OSL curves consisting of seriously overlapped peaks/components. The implications on application of the computerized curve deconvolution (CCD) method were discussed