Abstract

Sm<sup>3+</sup>/Yb<sup>3+</sup> co-doped tellurite glasses are prepared by melt-quenching technique. The density of the glasses varies between 4.65 and 4.84 g/cm<sup>3</sup>. The optical absorption spectra consist of eight bands in the wavelength range of 350-2 000 nm, which correspond to the transitions from ground level <sup>6</sup>H<sub>5/2</sub> to the various excited states of the Sm<sup>3+</sup> ion. Energy band gaps vary in the range of 2.73-2.91 eV, and the Urbach energy ranges from 0.21 to 0.27. Emission spectra exhibit four peaks originating from the <sup>4</sup>G<sub>5/2</sub> energy level centered at 576, 613, 657, and 718 nm. Quenches in emission bands may be due to the energy transfer from the Sm<sup>3+</sup> to Yb<sup>3+</sup> ions.

© 2013 Chinese Optics Letters

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