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Cs2NaYCl6 co-doped with V3+ and Re4+ was studied by optical absorption and luminescence spectroscopy. In the cubic host lattice both dopant ions substitute for the octahedrally coordinated Y3+. Visible by eye red up-conversion luminescence centered around 14000cm−1 is observed upon near-infrared excitation within the energy range from 10000 to 12000cm−1 between 15 and 300K. For V3+3T2g excitation...
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