The Influence of Yb³⁺ Co-Doping on Optical Properties of Sm³⁺-Doped Sodium Tellurite Glasses

Abstract:

A series of Sm³⁺-doped sodium tellurite glasses co-doped with Yb³⁺ were synthesized by melt quenching technique. The amorphous nature of the glasses was confirmed by X-Rays diffraction technique. From UV-Vis-NIR spectroscopy, eight absorption peaks of Sm³⁺ ions are observed. The broad absorption band in the range of ~870-1100 nm corresponds to the superposition of Sm³⁺: ⁶H_5/2 ⁶F_11/2 and Yb³⁺: ²F_7/2 ²F_5/2 transitions. The experimental and theoretical oscillator strengths of these bands were calculated by Judd-Ofelt theory. The optical band gap energy (E_opt) values for direct allowed transition and Urbach energy were found to be in the range of 2.73-2.91 eV and 0.21-0.27 eV respectively. Four luminescence emission bands ⁴G_5/2⁶H_5/2, ⁶H_7/2, ⁶H_9/2 and ⁶H_11/2 were revealed under 406 nm excitation and intensity of all bands is found to be quenched with addition of Yb³⁺ ions. The role of Yb³⁺ co-doping in the optical properties is compared and understood.

• Periodical: Advanced Materials Research (Volume 895)
• Pages: 359-362
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.895.359
• Online since: February 2014
• Authors: Fakhra Nawaz, M.R. Sahar, Sib Krishna Ghoshal
• Keywords: Band Gap, Oscillator Strength, Sm³⁺ Ions, Tellurite Glass

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DOI: 10.1103/physrev.92.1324