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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