Synthesis and luminescent characteristics of submicron powders on the basis of sodium and yttrium fluorides doped with rare earth elements

摘要

Submicron powders of solid solutions on the basis of cubic and hexagonal phases existing in a NaF-YF_3 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 (Na_(0. 414)Ca_(0. 183)Y_(0. 215)Yb_(0. 094)Er_(0. 094)F_(1. 989)), which demonstrates an upconversion luminescence quantum yield of 1. 9% with a 3-W pump power at a 974-nm wavelength.