Growth of Au Nanoparticles Stimulate Spectroscopic Properties of Er³⁺ Doped TeO₂-ZnO-Na₂O Glasses

Abstract:

The changes in optical properties of 70TeO₂-20ZnO-10Na₂O-0.5Er₂O₃-0.2Au glass system are stimulated by varying the heat treatment duration. The XRD data reveals broad humps in range of 25-35 degree representing the amorphous nature of the glass materials. The optical absorption edge at room temperature is used to estimate the direct (E_dir), indirect (E_indir) optical band gap and the Urbach energy (E_U). The value of E_dir lies between 2.937 to 2.943 eV, while the value of E_indir lies within 2.478 to 2.502 eV. The value of E_U is found to increase with longer time of heat treatment and lies between 0.409 to 0.424 eV. The characteristic surface plasmon resonance (SPR) band of Au nanoparticles (NPs) was observed at ~630 nm of optical absorption spectra. The strong and medium green upconversion (UC) fluorescence from Er³⁺ centred at 547 and 533 nm were observed at room temperature, in addition to a weak red UC fluorescence from Er³⁺ centred at 637 nm. The SPR stimulated by the presence of Au NPs enhanced the luminescence intensity by four and five folds for 1 and 4 hours heat treatment, respectively. The results indicate that there is a large influence of growth of gold NPs on the optical and spectroscopic properties of glass samples. Our results may be useful for the fabrication of nanophotonic materials.

• Periodical: Advanced Materials Research (Volume 895)
• Pages: 254-259
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.895.254
• Online since: February 2014
• Authors: Asmahani Awang, Sib Krishna Ghoshal*, M.R. Sahar, M. Reza Dousti, Fakhra Nawaz
• Keywords: Growth, Heat Treatment, Nanoparticle, Optical Band Gap, Urbach Energy

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