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Temperature Dependent Luminescence Spectra of Synthetic and Natural Alexandrite (BeAl<sub>2</sub>O<sub>4</sub>:Cr<sup>3+</sup>)
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Materials Sciences and Applications·Volume 02 (2011)·Pages 284–287·Published 22 March 2011·DOI10.4236/msa.2011.24037
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Abstract
Results of photoluminescence measurements for natural and synthetic alexandrite (BeAl<sub>2</sub>O<sub>4</sub>:Cr<sup>3+</sup>) are presented, where the samples are excited by the 488 nm line of an Ar<sup>+</sup> laser, at different temperatures. The main issue is the analysis of the Cr<sup>3+</sup> transition in the chrysoberyl matrix (BeAl<sub>2</sub>O<sub>4</sub>), with major technological application as active media for laser action. Results indicate anomalous behavior of Cr3<sup>3+</sup> transition depending on the measurement temperature. A simple model to explain the phenomena is suggested.
KeywordsAlexandriteLuminescenceCr<sup>3+</sup>TransitionsOptical Absorption
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