关键词: Ｇｄ_２Ｏ_２Ｓ , 　荧光粉 , 　均相沉淀法 , 　光致发光

Abstract: Gd₂O₂S:Dy³⁺  phosphors were synthesized by a homogeneous precipitation method from Gd₂O₃, Dy₂O₃, H₂SO₄ and Urea starting materials. The characterizations of Gd₂O₂S:Dy³⁺  phosphors were investigated by means of XRD, FE-SEM and PL spectra. XRD analysis shows that the precursor can be transformed into pure Gd₂O₂S powder by calcining at 900 ℃ for 1 h in hydrogen. FE-SEM observation shows that the Gd₂O₂S powder particles are quasi-spherical in shape, with a mean particle size of about 300~500 nm. Photoluminescence (PL) spectroscopy reveals that the main and second emission peaks are located at 579 nm and 488 nm under 270 nm UV light excitation, which corresponds to the ⁴ F_9/2→⁶H_13/2 and the ⁴F_9/2→⁶H_15/2 transitions of Dy³⁺ ions, and both transitions of Dy³⁺ ions have a single exponential decay behavior. The quenching concentration of Dy³⁺ ions is 1 %. The CIE coordinate and the color temperature of (Gd_0.99,Dy_0.01)₂ O₂S phosphor are (0.308, 0.379, 0.313）and 6 464 K respectively.

Key words: Gadolinium oxysulfide , Phosphor , Homogeneous precipitation , Photoluminescence