Darja Horvat Univ. of Ljubljana (Slovenia) Dušan Lazar Univ. of Novi Sad (Serbia) Janez Možina Univ. of Ljubljana (Slovenia) Janez Križan AMI d.o.o (Slovenia) Janez Diaci Univ. of Ljubljana (Slovenia) Mira Terzić Univ. of Novi Sad (Serbia)
Green emission lines, in addition to the blue and the red, were observed upon 980 nm excitation in yttrium oxide (Y2O3) nanopowder codoped with Yb3+ and Tm3+, synthesized by the chemical combustion method. Upconversion emission studies suggest that the number and characteristics of the green lines are influenced by the annealing temperature as well as by the Yb3+/Tm3+ concentration ratio, opening possibilities for new customized applications. The chromaticity properties of the upconversion spectra were quantified by the Commission Internationale de l’éclairage coordinate analysis.