Highlights
- First-time analysis of Linearly Modulated Optically Stimulated Luminescence (LM-OSL) in alexandrite.
- Natural alexandrite characterized by X-ray fluorescence, identifying iron (Fe) and chromium (Cr) as key elements.
- Deconvolution of LM-OSL curves into first-order components and analysis of their optical parameters.
- Dose-response tests revealed a liner relationship under blue, green and infrared light stimulation.
- Luminescence spectrum collected during stimulation with 470 nm diodes revealing a photoluminescence process.
Abstract
Linearly Modulated Optically Stimulated Luminescence (LM-OSL) analysis of alexandrite in powder form and incorporated with a polymer matrix was performed in order to investigate the components of its curves. LM-OSL curves were deconvoluted into four first-order components, and the behavior of their intensities revealed two traps’ pairs: super-fast component and fast component, and medium component and slow component, responsible for the LM-OSL signal of powder alexandrite. The thermal stability test showed that after 100°C of preheat temperature, the super-fast component of alexandrite pellet vanishes. A luminescence spectrum collected under 470 nm stimulation indicated a photoluminescence process, suggesting electrons excitation can cause disturbance in OSL process when the luminescence is stimulated with blue LEDs due to its high energy photons.
