Abstract
The glasses system TeO2-WO3-Li2O containing Er-Yb and Ag nanoparticle (TWLEYA) has been prepared by the metal quenching technique. In the presence of Ag2O in these glasses, silver nanoparticles (AgNPs) is obtained by mean of reheat-treated 12h duration. XRD measurements of the heat-treated glasses confirm the growth of the crystalline phase and glass-ceramic nature of samples. Uv-Vis absorption spectrum demonstrated the characteristic transition of Yb3+ and Er3+ ions with local surface plasmon resonance absorption band of AgNPs arisen at 525nm and 650 nm. For heat-treated TWLEYA glasses under 980nm excitation show two main upconversion transition peak at 548nm and 657nm emerging from 4S3/2 and 4F9/2 states of the Er3+ ions, respectively. All AgNPs doped TWLEYA sample produced huge green contrary to red emission by 980 nm pumping. However, the red emission enhanced by two-fold factor has been measured for 0.7mol% of AgNPs in TWLEYA sample. For these glasses, red emission enhancement is gained by local field proximity of the Ag NPs. Further contribution of optimum 0.7 mol% AgNPs in TWLEYA glass and its emission enhancement of possible energy transfer from AgNPs to Er-Yb has been analyzed.
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