We report on the synthesis and a detailed spectroscopic study of an Er3+ -doped “mixed” (Lu,Y,La)2O3 transparent sesquioxide ceramic. Nanopowders of the composition (Lu0.63Y0.25La0.05Er0.07)2O3 were obtained by a glycine-nitrate self-propagating high-temperature synthesis. The ceramics were obtained by vacuum sintering at 1750 °C for 3 hours. La2O3 acted as a sintering additive and increased the disorder of the sesquioxide lattice. The ceramic had a cubic (C-type) structure. At 1.05 μm, its transmission was 78.9%. The ceramic exhibited intense mid-infrared emission owing to the 4 I11/2 → 4 I13/2 Er 3+ transition. The corresponding peak stimulated-emission cross-section σSE is 1.12×10-20 cm2 at 2717 nm. The luminescence spectrum exhibited a considerable inhomogeneous broadening as compared to the parent compounds, Er:Lu2O3 and Er:Y2O3. The luminescence lifetimes of the 4 I11/2 and 4 I13/2 manifolds were measured (1.99 ms and 3.35 ms, respectively), representing a favorable ratio for mid-IR laser operation. The crystal-field splitting of Er3+ multiplets in C2 sites was determined at low temperature.
SiO2,MgO-codoped Al2O3−Ce:YAG composite ceramics with different Ce3+ doping concentrations (0.05-0.3 at%) have been fabricated via reactive vacuum sintering, for the purpose of high power white light-emitting diodes (WLEDs). Optical and luminescence characteristics of color converters were investigated by transmittance spectra and photoluminescence examinations. It is found that WLEDs based on synthesized phosphors with 0.05-0.1 at% Ce3+ doping have an optimal balance between high color-rendering index, luminous efficacy and appropriate correlated color temperature values.
Nanostructured films based on branched gold nanoparticles were obtained by self-assembly method. The possibility of controlling the film thickness in the range of 500 to 800 nm with preservation of their homogeneity and nanoparticle size (DSEM = 55 ± 12 nm) was shown. Position of localized surface plasmon resonance in absorption spectra of the film structures at λlspr = 595 to 600 nm is almost independent on the film thickness. The efficient surface-enhanced Raman spectroscopy substrates based on branched gold nanostructures were developed.
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