“…Studies on upconversion using the 1:54 mm excitation wavelength have been concentrated on the Er-doped fluorides BaYF 5 [4], BaY 2 F 8 [5,6], YF 3 [5,7], LiYF 4 [8][9][10], CaF 2 [11], SrF 2 [8][9][10][11][12], CdF 2 [12][13][14], fluorindate glass [15], and vitroceramics [16] as well as the oxides Y 3 Al 5 O 12 ðYAGÞ [8], YAlO 3 [17], and silica glass [17]. In this work a fluoroindate glass doped with Er and Yb has been prepared and analyzed.…”