Abstract
ABSTRACTIn this paper, nano gold (Au) and nano gold-erbium (Au-Er) co-embedded potassium zinc silicate based monolithic plasmonic glass nanocomposites have been evaluated. These plasmonic glass nanocomposites of Au were prepared by a controlled heat-treatment of the K2O-ZnO-SiO2 glasses obtained by melt-quench technique. Differential scanning calorimeter, dilatometer, ultra violet-visible absorption spectrophotometer, X-ray diffractometer, transmission electron microscope, Fourier transform infrared spectrometer, prism coupler and spectrofluorimeter were used to characterize the glasses and heat-treated glass nanocomposites. A gradual creation of more Au0 nanoparticles with prolongation of heat-treatment time resulted in strong surface plasmon resonance band around 520 nm in the glass nanocomposite samples. Decreased photoluminescence spectral intensities of Er3+ ion around 550 and 1540 nm due to 2H11/2, 4S3/2 → 4I15/2 and 4I13/2 → 4I15/2 emission transitions were observed with increase in heat-treatment time. The decrease in emission intensity was caused due to lower excitation spectral intensity of Er3+ ions and higher absorption intensity of Au0 nanoparticles around 523 nm with increase in heat-treatment time of the samples.
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