Synthesis and properties of core-shell SiO2@Y2O3:Eu3+ wavelength conversion materials

In this paper, with spherical SiO2 particles fabricated via Stöber method, monodispersed and uniform SiO2 @Y2O3:Eu3+ core-shell submicrospheres were prepared through a simply homogeneous precipitation method. SEM, TEM and XRD analysis indicated that the as-prepared samples were uniform and well monodispersed spheres. The SiO2 core was perfectly coated by the shell composed of cubic crystalline Y2O3:Eu3+ and the thickness of the shell was about 26 nm. Photoluminescence spectra showed that the luminescence efficiency was improved remarkably after being coated on the SiO2 core. The 3D PL spectra showed that almost all UV photons in the range from 200 nm to 400 nm can be converted to visible photons by the as-prepared samples. Results showed that when the SiO2 core was synthesized in the TEOS single feeding model with the amount of core being 0.4 g, doping concentration being 4% and annealing at 800 degrees C, the sample has the best performance on luminescence. By dispersing the as-prepared sample in the anti-reflection sol to prepared the wavelength conversion and anti-reflection film and apply it to the silicon solar cell, the photoelectric conversion efficiency can be increased by 7.41% in maximum.