Correlation between thermoluminescence and optically stimulated luminescence responses of natural alexandrite.
Luminescent properties of alexandrite crystals (BeAl2O4:Cr3+ are studied. Partial readouts of thermoluminescence (TL) and optically stimulated luminescence (OSL) signals were obtained to infer the relations of OSL and TL trapping centers. Four TL peaks were studied; their intensities decrease at different rates by illumination with blue OSL light. The OSL curve shows two time components (exponential decay constants 3.15 and 28.4 s) The short time component is preferentially diminished when the sample is heated to temperatures from 363 to 513 K. About 50% of the whole TL intensity remains after a complete 300s OSL readout.
Applied radiation and isotopes including data, instrumentation and methods for use in agriculture, industry and medicine