The Er2O3-Yb2O3 codoped TeO2-Bi2O3-Na2O-Glasses along with addition of AgNO3 in basic compositions glasses have been prepared by traditional melt quench method. Investigation of the synthesized glasses is done by DSC, XRD, and UV-Vis. spectroscopy. The glass transition temperature is observed by differential scanning calorimetry. The amorphous nature of the synthesized glasses is confirmed by X-ray diffractogram taken at room temperature. The fluid displacement method on the basis of the Archimedes principle was used to calculated density of prepared samples. The UV-Visible absorption characterizations have been done in the range of 200–1100 nm of synthesized glasses having different percentage of doping of Er2O/Yb2O3/AgNO3. The study of optical properties of the glasses such as the absorption coefficient (α), cut-off wavelength, forbidden energy band gap (Eopt), refractive index and Urbach Energy (Eu) have been done. The effect of Er2O/Yb2O3/AgNO3 on optical properties is observed.

Tellurite glasses are promising upconversion optical and laser materials. The upconversion efficiency is strongly influenced by maximum phonon energy of the host, tellurite glasses have lower phonon energy than many common oxide glasses. The characteristic glass transition temperature T g and crystallization onset Tx, differential scaning calorimetry (DSC) is studied. Glassy structure is verified by XRD. Study of visible absorption spectra and upconversion spectra of rare earth ion doped Bismuth tellurite glasses designate it as futuristic photonic material.

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.

Lanthanide ions doped glasses are studied by researchers for upconversion luminescence. Rare earth doped bismuth tellurite glasses codoped with and without silver nanoparticle were synthesized by melt and quench procedure for the study of enhanced upconversion luminescence. Physical parameters as molar mass, molar volume, and density were evaluated. Amorphous nature of samples was verified by x-ray diffraction. DSC is carried for information of thermal properties. UV-Visible absorption and fluorescence spectra is obtained to get detail information of upconversion luminescence. Upconversion mechanism of rare earth erbium and ytterbium ions discussed. Three prominent upconversion luminescence is observed two in green region and one is in red.