Abstract
High resolution spectroscopy of Nd3+ in Potassium Lithium Yttrium Fluoride (KLiYF5) at ≤80 K reveals two crystal-field sites which are equally populated independent of concentration. Site selective excitation of photoluminescence distinguishes each site’s contribution to the spectra. The analysis of integrated line intensities reveals a bidirectional energy transfer between Nd3+ ions in different sites. The energy transfer rate increases rapidly with Nd concentration and depends strongly on temperature (2 K – 80 K).
© 1994 Optical Society of America
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