Study on Preparation of Ce3+-Doped LaAlO3 Powder by Solution Combustion Method and Its Fluorescence Properties
Using La(NO3)3·6H2O,Al(NO3)3·9H2O,and Ce(NO3)3·6H2O as the raw materials and C2H5NO2 as a reducing agent,La1-xCexAlO3(x=0.01,0.02,0.03,0.04,0.05)samples were synthesized by solution combustion method and analyzed by XRD,SEM,UV-Vis DRS,XPS,and XRF.The results show that compared with LaAlO3 prepared at other temperatures or with different Ce doping amount,La0.97Ce0.03AlO3 prepared at 825 ℃ for 4 h possesses more prominent and distinct XRD characteristic peaks.And the sample exhibits dispersed particles,and a clear contour,with a particle size of 21.59 nm.The absorption of the sample also becomes stronger in the ultraviolet-visible region with a band gap width of 4.86 eV.Ce3+ions have occupied part of the positions of La3+in the LaAlO3 lattice,with an optimal Ce3+doping concentration of 0.03.Its strongest characteristic peak of the emission spectrum appears at 525 nm,emitting yellow-green light.
NETL
NSTL
万方数据
