A series of Er doped LaAlO₃:Er³⁺(Er³⁺:La=0.10,0.15,0.20,0.25) nanomaterials were prepared by solution combustion method.The samples were anal yzed by X-ray diffraction (XRD),scanning electron microscopy (SEM),ultraviolet-visible (UV-Vis) diff u se reflectance and fluorescence spectroscopy.The results show that when the cal cination temperature is 800℃ and the doping ratio is 0.10,the morphology disp ersion is fine,the grain size is 28nm,and XRD has the stronges t peak intensity.UV-Vis diffuse reflectance spectrum (DRS) shows that the sample has we ak absorption at 522nm,and the band gap width is reduced to 5.29eV.Under the excitation of UV light,the sample has a high intensity and sharp emission peak at about 425nm,which corresponds to the energy level transition of Er³⁺ from ²H9/2→⁴I15/2.The two weak emission pea ks at about 500nm correspond to the e lectronic transitions of ⁴F7/2→⁴I15/2 a nd ²H11/2→⁴I15/2,respectively.When the doped ratio is between 0.20and 0.25,the luminous intensity increases with the increase of the doped ratio,and the luminous peak is red shifted.These results indicate that Er³⁺ enters into LaAlO_3and has fine luminescent properti es,which has potential application value in the field of luminescent materials.