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Heavy metal lead germanate glasses doubly doped with Yb3+ and Ln3+ ions(Ln=Er,Tm) were investigated.Up-conversion spectra of Er3+ and Tm3+ were registered under diode-laser excitation of Yb3+.Up-conversion luminescence bands corresponded to 4S3/2→4I15/2(green) and 4F9/2→4I15/2(red) transitions of Er3+ as well as 1G4→3H6(blue) and 3H4→3H6(NIR) transitions of Tm3+,respectively.
Up-conversion spectra of Er3 + and Tm3 + were registered under diode-laser excitation of Yb3 + .Up-conversion luminescence bands corresponded to 4S3 / 2 (Ln = Er, → 4I15 / 2 (green) and 4F9 / 2 → 4I15 / 2 (red) transitions of Er3 + as well as 1G4 → 3H6 (blue) and 3H4 → 3H6 (NIR) transitions of Tm3 +, respectively.