Abstract
LaF 3 , metal-oxide system for use as the base material, containing Er3+ and Yb3+ for host crystal of rare-earth (RE) elements were prepared by solid state reaction method and its upconversion (UC) luminescence excited by 980 nm laser was studied. The effects of firing temperature, LaF3 with Er3+, Yb3+ concentrations on the UC emission behavior were examined. The LaOF product sintered at ffOO °C contained LaF 3 phases and exhibited strong green and red emissions arising due to the 2H 11/2 , 4S 3/2 →4Ii 5/2 and 4F 9/2 →4Ii 5/2 transitions for Er3+ ion, respectively. Bright yellow color by the mixing of green and red colors was observed in the LaOF product doped with 0.01 at.% Er3+ and 0.01 at.% Yb3+. It suggests that LaOF : Er3+, Yb3+ is a potential material for the yellow upconversion phosphor.
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