Abstract
Single-crystal LiKGdF5:Er3+,Tb3+ was synthesized by using hydrothermal techniques. After measuring luminescence andexcitation spectra, we observed the up-converted green (, ) and red () emissions, as well as the weak blue emissions fromEr3+ ions in the crystal. Analysis indicates that the blue up-conversion occursvia a sequential absorption of three photons. By assuming the ion is in aC2V instead ofthe actual C2 site, a crystal-field (cf) calculation has been performed on the reduced7FJ basis ofthe ground7F term of the Tb3+ ion. Excellent correlation was obtained between the experimental transition energies andthe computed level structures. The cf parameter obtained is very well transferable to theEr3+ energylevels in LiKGdF5.
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