Abstract
Results of a vacuum ultraviolet spectroscopic characterization of NaMgF3:Yb2+ are presented. The material demonstrates emission features associated with self-trapped excitons and impurity-trapped excitons. The emission features noticeably overlap giving rise to a broad emission band from 17000 to 35000cm−1 at a sample temperature of 8K. To identify the true profiles of the emission features we have used a deconvolution procedure. The deconvolution was possible due to the thermal quenching of self-trapped excitons at room temperature that allowed for direct observations of the impurity trapped exciton emission band. Energy transfer between host electronic excitations (excitons and e–h pairs) and Yb2+ ions leading to the formation of impurity-trapped excitons is evident from excitation spectra.
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