Luminescence characterization and synthesis of γ-LiAlO₂:Eu³⁺ by gel combustion

Abstract

γ-LiAlO₂:Eu³⁺(Eu³⁺:LAO) phosphor was obtained by gel combustion method using LiNO₃, Al(NO₃)₃·9H₂O, Eu(NO₃)₃·6H₂O and citric acid as raw materials. The structure, morphology and luminescence were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL). The results demonstrated that the phosphor was pure-phase of flaky tetragonal crystal system with a mean size of around 1 μm. The strongest excitation peak was at 254 nm, belonging to the broadband excitation and the maximum emission peak was at 613 nm, corresponding to the ⁵ D ₀→⁷ F ₂ transition of Eu³⁺. Luminous intensity is closely related to the calcination temperature and doping concentration of Eu³⁺.

Keywords

red phosphor / γ-LiAlO₂: Eu³⁺ / gel combustion method / rare earths

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