Optically stimulated luminescence of alexandrite

Matheus C.S. Nunes, Neilo M. Trindade, Elisabeth M. Yoshimura, Makaiko L. Chithambo.

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Highlights

  • Optically Stimulated luminescence (OSL) of alexandrite (BeAl2O4:Cr3+) from Brazil was investigated.
  • The samples demonstrated results for three different stimuli: 470 nm blue, 525 nm – green and 850 nm – infrared light.
  • It was possible to describe the OSL curves with 3 components: fast (C1), medium (C2) and slow (C3).
  • The charge traps related to the thermoluminescence (TL) signal of the sample are optically active.

Abstract

We report the optically stimulated luminescence (OSL) of natural alexandrite (BeAl2O4:Cr3+) from Brazil. Luminescence was stimulated using 470 nm blue, 525 nm green and 850 nm infrared light. The dose-response of the OSL is linear in all cases, a desirable feature of dosimetry applications. The influence of preheating on OSL suggests that electron traps associated with the thermoluminescence of alexandrite contribute to the OSL. Mechanisms responsible for luminescence in alexandrite have been briefly considered.

Keywords

Alexandrite; Light-emitting diodes; Optically stimulated luminescence; Ionizing radiation; Dosimetry.

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