Abstract

Na5Lu9F32 single crystals co-doped with 1 mol. % Er3+ and various concentrations (0.1 mol. %, 0.3 mol. %, 0.5 mol. %, 0.7 mol. %, and 1 mol. %) of Pr3+ were successfully grown using the Bridgman method. Optical spectroscopic investigations of the obtained single crystal were reported for the absorption, emission, and luminous decay. The obtained single crystal appears with almost no absorption at the 2.7 μm band, attributable to the OH bond. According to the Judd–Ofelt (J-O) theory, the J-O intense parameters of Er3+ ions were calculated. Under the 980 nm LD pumping, an obviously enhanced emission at 2.7 μm was obtained in the Er3+/Pr3+ co-doped crystal compared with the Er3+ singly doped crystal due to the energy transfer from Er3+ to Pr3+. The most intense emission at 2.7 μm was obtained when the doping concentrations of Er3+ and Pr3+ were 1 mol. % and 0.5 mol. % in the present research. The maximum emission cross-section and gain cross-section at 2.7 μm were also estimated. Moreover, using the Dexter theory, the energy transfer microscopic parameters have been calculated, and the decay curve fitting using the Inokuti–Hirayama expression indicated the dipole–dipole energy transfer from Er3+ to Pr3+ ions.

© 2017 Optical Society of America

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