Abstract
We observed a significant blue emission at 476nm in Tm3+ and Yb3+-codoped KGd(WO4)2 monoclinic single crystals by pumping at 940nm. The single crystals were grown using the top-seeded-solution-growth slow-cooling method (TSSG). We also report thulium emissions at 650nm, 802nm and 1.48μm. The emission spectra are characterized as a function of the Tm3+ and Yb3+ ions concentration and temperature from 6K to room temperature. The energy upconversion excitation mechanism for thulium emitting levels is assigned to a cooperative energy transfer process by the ytterbium-sensitizer ions.
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