Synthesis and Characterizations of Mesoporous YVO4: Eu~(3+)@SiO2

摘要

The mesoporous YVO4: Eu~(3+)@SiO2 was synthetized by combination of in-situ synthesis with soft template method. At the same time, the mesoporous SiO2 and YVO4: Eu~(3+) nanocrystal were also synthesized. The structure, morphologies, UV — vis spectra, photoluminescence properties and fluorescence lifetimes were studied systemically. And the photoluminescence property of mesoporous YVO4: Eu~(3+)@SiO2 was studied comparing with YVO4: Eu~(3+) nanocrystal. The results showed that the mesoporous YVO4: Eu~(3+)@SiO2 possessed highly ordered mesoporous structure. The intrinsic excitation bands of Eu~(3+) disappear. Under excited VO4~(3+), the characteristic emission of Eu~(3+) ions was obtained in the mesoporous YVO4: Eu~(3+)@SiO2. The lifetimes of Eu~(3+) become short in the mesoporous YVO4: Eu~(3+)@SiO2. The photoluminescence efficiency of mesoporous YVO4: Eu~(3+)@SiO2 was higher than that of the YVO4: Eu~(3+) nanocrystal.