Abstract
Submicron powders of solid solutions on the basis of cubic and hexagonal phases existing in a NaF-YF3 system have been synthesized with the precipitation method from aqueous solutions at room temperature. The conditions for the preparation of single-phase samples have been determined. The upconversion luminescence spectra were investigated. The most promising composition is revealed (Na0.414Ca0.183Y0.215Yb0.094Er0.094F1.989), which demonstrates an upconversion luminescence quantum yield of 1.9% with a 3-W pump power at a 974-nm wavelength.
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