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Infrared-to-visible upconversion luminescence in SrF2:Er powders upon excitation of the 4I13/2 level
Optical Materials Express Vol.8 (№7): PP. 1863-1869 · 1 July 2018
A. A. Lyapin, S.V. Gushchin, S. V. Kuznetsov, P. A. Ryabochkina, A. S. Ermakov, V. Yu. Proydakova, V. V. Voronov, P. P. Fedorov, S. A. Artemov, A. D. Yapryntsev, V. K. Ivanov
Fluorite-type SrF2:Er powders were synthesized by using a co-precipitation from the aqueous solution technique. X-ray powder diffraction, scanning electron microscopy, absorption and luminescence spectroscopy were used to characterize the samples. For the first time upconversion luminescence of SrF2:Er powders in the visible and near-infrared spectral region upon excitation of 4I13/2 level Er3+ ions was investigated. The decrease in the slopes of the visible upconversion luminescence with increasing excitation power density and concentration of Er3+ ions were experimentally observed and discussed. The most intensive visible luminescence was obtained for SrF2:Er (8.8%) with a maximum quantum yield of 0.19%. Chromaticity coordinates and color temperature of yellow-green upconversion luminescence of SrF2:Er were calculated.