Band shape modulation optically stimulated luminescence (BSM-OSL) - Simulations and first experiments

Abstract

Recently it was shown that making use of the dependency of optical cross-section (OCS) of trap on the experimental parameters can help to enhance the ability to separate signals from different traps. When the light source applied for stimulation delivers the spectral band of a finite width, the physical quantity that governs the luminescence process is not the OCS value but rather a kind of weighted average of the OCS value over the range of the stimulation band. Changes of the shape of the stimulation band allow to regulate the shape of OSL curve. The band shape modulation can be easily attained using at least two sources of light. The shape of a band that is the sum of bands from two sources can be controlled by changing the emission intensity of each source. The presented results of simulations and experiments demonstrate what can be achieved by means of such a band shape modulation. The ability to separate the signal from different kinds of traps depends significantly on the selection of the experimental parameters such as the energy of the maxima of the component spectral bands, the difference of these maxima as well as the rate and the character of light intensity changes. When the experimental parameters are properly selected the OSL curve for a single trap has the form of a peak.