Hydrothermal Synthesis and Luminescent Properties of Eu³⁺ Doped Sr₃Al₂O₆ Phosphor for White LED

Eu³⁺ ions doped Sr₃Al₂O₆ phosphors were successfully synthesized via a hydrothermal method. The precursor was prepared by low temperature hydrothermal method using ammonia as both alkaline source and precipitator. Then the final product was obtained by high temperature sintering. In addition, the structures, morphologies, and luminescent properties of as-prepared products were thoroughly characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), Fluorescence spectroscopy (PL). XRD shown a single phase Sr₃Al₂O₆ prepared by a facile hydrothermal method at 250 °C for 10 h. In the PL spectra of as-prepared samples, the optimal value of Eu³⁺ concentration is 2 mol%. From the fluorescent spectra, the emission peaks of Sr₃Al₂O₆: Eu³⁺ phosphors are centered at around 591 nm, and the excitation peaks are centered at around 233 nm, 323 nm, 394 nm, and 468 nm, respectively, which were assigned to the characteristic transition of Eu³⁺ ions. The influence of ammonia, and the synthesis temperature on the luminescent properties of Sr₃Al₂O₆: Eu³⁺ phosphors were studied in detail. The alkaline earth aluminates luminescent materials activated by rare earth ions have good prospects in the field of new-generation light sources.