Preparation and Photoluminescence of Mesoporous ZrO2/(1-n)SiO2-nAl2O3 Nanocomposites
纳米ZrO2/(1-n)SiO2-nAl2O3介孔复合作的制备与光致发光

(1-n)SiO2-nAl2O3 (n=0, 0.01, 0.1) aerogels were prepared by using a sol-gel route and followed by the supercritical drying technique. Nano-ZrO2 precipitates were introduced into the pores of the aerogels. Photoluminescence of the ZrO2/(1-n)SiO2-nAl2O3 nanocomposites was measured. The results show that the luminescence peak at about 540nm (2.30eV) for nano-ZrO2 bulk sample shifts to 400nm (3.10eV) (blue shift) for ZrO2/(1-n)SiO2-nAl2O3 nanocomposites, when the excitation wavelength is 316nm (3.92eV) at room temperature. The blue shift is about 140nm. The relative intensities of the luminescence peak change with the doping amount of the nano-Al2O3. Mechanism of change of the luminescence peak in the visible region was proposed.