LAUSR

Abstract The oxyfluorosilicate glasses with the composition of (44-x)SiO 2  + 5Al 2 O 3  + 17 Na 2 CO 3  + 18SrF 2  + 15CaF 2  + 0.5Nd 2 O 3  + xYb 2 O 3 (x = 0.1, 0.5, 1.0 and 2.0 mol %) have been prepared by conventional melt quenching technique. The optical absorption, emission and up-conversion spectra were carried out. The strong absorption peak observed at 804 nm corresponding to the transition 4 I 9/2  →  4 F 5/2  +  2 H 9/2 . The emission spectra were recorded for Nd 3+ singly and Nd 3+ /Yb 3+ co-doped glasses with 808 nm laser diode as an excitation source. For the present investigation, the glass co-doped with 0.5 Nd 3+ , 0.5 mol% Yb 3+ ions have the highest emission intensity. PL up-conversion (UC) emission have been analysed under the excitation of 980 nm laser diode. It is observed that four intense up-conversion emission bands at around 500 nm, 537 nm, 596 nm and 662 nm ascribed to the electronic transitions 4 G 9/2 → 4 I 9/2 , 4 G 7/2 + 2 K 13/2 → 4 I 9/2 , 4 G 5/2 + 2 G 7/2 → 4 I 9/2 and 4 G 7/2 + 2 K 13/2 → 4 I 13/2 respectively. The green emission band at 500 nm ( 4 G 9/2 → 4 I 9/2 ) has the highest peak intensity for 0.5 mol % Nd 3+ and 2.0 mol % Yb 3+ ions co-doped glass. For the present work the values for n = 1.76, 1.93 and 2.25 for UC emission at 500, 596, 662 nm respectively. The value n≈2 suggesting that two photons are involved in the UC process of present glass system. The above results suggesting that the prepared glasses co-doped with Nd 3+ /Yb 3+ ions may be used for green light emitting display device applications.