Erbium and Erbium/Ytterbium co-doped tellurite glasses have been prepared by melt quench technique. Two characteristic band; at 650 – 660 cm−1 (axial band) and at 725 -785 cm−1 (equatorial band) of TeO2 are exhibited in the spectrum. Up conversion emission spectra of Er3+/ Yb3+ co-doped sample under 976nm excitation is studied., which revealed four prominent emission bands at 531, 548, 670 and 846 nm originating from 2H11/2 → 4I15/2, 4S3/2 → 4I15/2, 4F9/2 → 4I15/2 and 4S3/2 → 4I113/2 transitions, respectively, which is most intense in green region. Down conversion of singly doped Er3+ tellurite glasses under 532nm excitation is also studied which showed emission bands centered at 548, 660, 797, 847 and 976 nm attributed to 2H11/2 + 4S3/2 → 4I15/2, 4F9/2 → 4I15/2, 2H3/2 → 4I13/2, 4S3/2 → 4I13/2 and 4I11/2 → 4I15/2 transitions, respectively. The variation of luminescence intensity at different laser excitation powers is observed. Near infrared radiation has been generated.
