Enhancing the up-conversion luminescence and nonlinear optical properties by incorporating various metallic nanoparticles (NPs) into rare earth (RE) doped glass oxides is the key issue towards the fabrication of photonic devices. Series of erbium doped phosphate glasses containing ZnO NPs with composition (78.5-x)P2O510Li2O 10ZnO 1.5Er2O3(x)ZnO, where 0 x 1.2 are prepared by melt quenching technique and their spectroscopic characterization are made. The amorphous nature of the glass is confirmed by XRD spectra. The influence of NPs on the luminescence characteristics using 357 nm excitations is studied and the mechanisms involved in the enhancement on emission intensity are examined. The emission spectra exhibit eight peaks in which the peak intensity of the violet and blue band (413 and 458 nm) shows gradual increment with increasing concentration of ZnO NPs added to the host matrix. The enhancement in the emission peak intensity for the transition is attributed to the effects of quantum confinement and local field of ZnO NPs. The effect of NPs within the glass matrix in influencing the optical properties are analysed and discussed. Our observation may contribute towards the development of nanophotonics.
Precise manipulation of nanoparticles (NPs) in rare earth doped inorganic glasses for achieving tuneable physical and optical properties is challenging. Series of erbium doped phosphate glasses containing ZnO NPs with composition (78.5-x)P2O510Li2O10ZnO1.5Er2O3(x)ZnO, where 0x1.2 are prepared using melt quenching method. The local structures analyzed using FTIR spectra reveal an increase in depolymerisation of the glass at Q3 tetrahedral sites due to the introduction of ZnO NPs. The optical band gap energy obtained from UV-Vis absorption spectra varies within 3.533.59 eV and the Urbach energy increase as much as 0.260 eV. The role of ZnO NPs within the lithium (II) oxide-zinc oxide-phosphate glass matrix in influencing the optical and structural responses are analyzed and discussed. The observed optical improvements suggest that these glasses are potential for photonic devices.
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