Mechanisms of luminescent responses in thermal and optical stimulation of potassium feldspars

We propose a model describing the mechanism for generation of an optically stimulated luminescence signal in potassium feldspars when irradiated in an IR absorption band (IR OSL). The model assumes that this type of stimulated luminescence is intercenter by nature, arising in tightly bound deep trap/ionized luminescence center pairs. At the same time, the thermoluminescence (TL) signal and the optically stimulated afterglow (OSA) signal arise in a recombination process with participation of the conduction band. We describe the results of an experimental test of the proposed model.