关键词: LaAlO₃:Eu³⁺纳米晶, 复合沉淀法, 发光性质

Abstract: The LaAlO₃:Eu³⁺nanocrystals were prepared by the complex precipitation processing using NH₃·H₂O-NH₄HCO₃ mixture as complex precipitant. The material was characterized by XRD,SEM and TEM techniques. Three dimension spectra,emission and excitation spectra have been measured. The results indicate that the LaAlO₃:Eu³⁺nanocrystals were in spheric phase with good dispersion,by annealing at 800 ℃ for 2 h. The crystal size is about 40 nm. The luminescent properties of Eu³⁺ in the LaAlO₃ nanocrystals have been measured by 3D,including optimal emission and excitation wavelength. In emission spectrum the band at 591 nm and 613 nm are corresponding to ⁵D₀-⁷F₁ and ⁵D₀-⁷F₂ transition of Eu³⁺ ions. The intensity of the ⁵D₀-⁷F₁ transition is bigger than the ⁵D₀-⁷F₂ transition. With increasing in annealing temperature this trend is increased obviously. This phenomenon shows that the Eu³⁺ ion in the LaAlO₃ nanocrystals is symmetrical.

Key words: LaAlO₃:Eu³⁺nanocrystals, complex precipate, luminescence properties