Abstract
Emission and excitation spectra of Cs2NaLnCl6 (Ln = Y, Eu, Gd, Er, Yb), Cs2NaYCl6:Ce and Cs2NaYCl6:Tm have been recorded using synchrotron radiation. With the possible exception of the case for Ce3+, no 5d →4f transitions are observed and the emission spectra are entirely assigned to 4f→4f intraconfigurational transitions of Ln3+
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