Laser-induced time-resolved luminescence of rare-earth elements in scheelite

Open University of Israel, Department of Natural Sciences, Tel-Aviv, Israel
Universite Claude Bernard, France
Russian Academy of Sciences, Russian Federation
Department of Inorganic and Analytical Chemistry, Israel

Natural and synthetic scheelite are investigated by time-resolved laser-induced luminescence to detect and ascribe various luminescence lines to a variety of REE. The selectivity of detection is possible by using different time delays after excitation, different gate widths and different excitation wavenumbers and allowed to detect REE in samples where they are hidden by intrinsic luminescence and not visible in the steady-state spectra as well as by cathodoluminescence. Luminescence of Pr (super 3+) , Er (super 3+) and Tm (super 3+) are detected even with low concentrations and in the presence of Tb (super 3+) , Dy (super 3+) and Sm (super 3+) . Luminescence of Ho (super 3+) and Yb (super 3+) is firstly detected in natural scheelites and luminescence of Eu (super 2+) and Ce (super 3+) is preliminary suggested.

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