Borate glasses Chlorine compounds 1 Emission bands 1 Emission properties 1 Energy gap 1 Erbium compounds 1 Erbium-vanadium doped glasses 1 Fourier transform infrared spectroscopy 1 Glass 1 Glass samples 1 Light absorption 1 Melt quenching method 1 Metal nanoparticles 1 Optical emission spectroscopy 1 Optical fibers 1 Photoluminescence 1 Photoluminescence spectroscopy 1 Refractive index 1 Silver compounds 1 Silver nanoparticles 1 Silver nanoparticles (AgNps) 1 Structural and optical properties 1 UV–Vis spectroscopy 1 Urbach energy 1 VIS spectroscopy 1 Vanadium compounds 1 X ray diffraction 1