Properties Of Y₂O₃Upconversion Lumienescence Reinforced3c-sic Nanocrystalline Composite Film

3C-SiC is an ideal alternative semiconductor material using for photocatalyticdecomposition of water. The relative narrow bandgap about2.3eV makes it to possessa relative high light absorption in visible region. In order to improve the photoelectricconversion efficiency,3C-SiC nanocrystals are combined with the upconversionluminescence materials to prepare the composite film in this paper. In this way, theupconversion luminescence materials can transform the near-infrared light in solarwhich cann’t be absorbed by3C-SiC nanocrystals into visible light, thus theabsorption and photoelectric conversion efficiency of3C-SiC can be improved tosome extent.This paper aims to prepare ultra-fine3C-SiC nanocrystals by chemical etchingmethod, and sizes of3C-SiC nanocrystals can be controlled by the reaction time.After refining the nanometer grain size of3C-SiC, there will be an obvious blue shiftof UV-Visible absorption edge, that is to say that the band gap of3C-SiC nanocrystalsgets wider than that of3C-SiC solid. Due to the quantum confinement effect,3C-SiCnanocrystals show adjustable photoluminescence characteristics under the excitationlight with different wavelengths.Er3+, Yb3+co-doped Y2O3nanoparticles are obtained by coprecipitation method.The morphology of doped Y2O3.nanoparticles will be changed obviouly underdifferent preparation parameters. At the same time, the characteristic of up-conversionluminescence can be optimized through adjusting the doping amounts of Er3+andYb3+. The results show that the upconversion luminescence efficiency of Y2O3nanoparticles is the best when the doping content of Er3+and Yb3+is1%,2%respectively. According to XRD analysis, there is no obvious difference in crystalstructure of Y2O3after doping. The TEM results display high crystallinity of the Y2O3nanoparticles. The3C-SiC nanocrystals are successfully combined with Y2O3viacoupling agent of APTMS, which is confirmed by the FTIR and TEM analysis.Finally, the3C-SiC nanocrystal films and3C-SiC/Y2O3composite films areprepared at the aid of Nafion and dopamine. The results show that3C-SiC/Y2O3composite films possess relative good visible light absorption characteristics. The3C-SiC nanocrystal films and3C-SiC/Y2O3composite films both appear obviousphotocurrent under Xe lamp irradiation, and using dopamine as surface treatment agent, the3C-SiC nanocrystals films hold a photoelectric conversion efficiency of0.26%. The next work will be focused on the photoelectric response and watersplitting performance of3C-SiC nanocrystals films and3C-SiC/Y2O3composite filmsirradiated by infrared light and solar light.