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The Li co-doped Y2O3: Ho /Yb films were prepared with sol-gel method and spin-coating technique. The effects of Li + on the structure and luminescent properties of the films were investigated. The results show the grain size increased first and then decreased with the increase of Li + doping concentration. The crystal size of particles composing the film got the maximum value when Li + concentration took 4 mol%. As Li + doping concentration increased, the optical transmittance of the Y2O3: Ho /Yb film improved at first then reduced and got the maximum at 3 mol%. Excited with a 980-nm laser, there were two green emissions in the up-conversion emission spectra, one centered at 535 nm, the other at 550 nm, which ascribed to the 5F4→ 5I8 and 5S2→ 5I8 transitions of Ho 3+ , respectively. The up-conversion luminescence intensity also increased firstly and then decreased with the Li + doping concentration increase, and got the highest value at 2 mol%.

Effects of Li+ Doping Concentration on Structure and Photoluminescence of the Y2O3: Ho3+/Yb3+ Up-conversion Film