A general precursor of Lu₂O₂SO₄ and Lu₂O₂S was synthesized by homogeneous precipitation methods using commercially available Lu₂O₃, H₂SO₄, Eu(NO₃)₃·6H₂O, CO(NH₂)₂, NH₃·H₂O, Na₂CO₃ and S as the main raw materials, and then Lu₂O₂SO₄:Eu³⁺ is calcined under air atmosphere at different temperatures, which simplified the previous experimental steps. On this basis, a series of Eu³⁺ doped Lu₂O₂S phosphors were synthesized by the solid phase method using the precursor as raw material by mixing sodium carbonate and sublimated sulfur. Lu₂O₂SO₄:Eu³⁺ and Lu₂O₂S:Eu³⁺ quasi-spherical luminescent powder with particle sizes of about 1 μm were synthesized and their synthetic mechanism and photoluminescence properties were investigated. Finally, the synthesized products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscope (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimeter (DSC-TG), photoluminescence spectroscopy (PL) and other analytical and testing methods. Studies have shown that the optimum calcination conditions of Lu₂O₂SO₄:x%Eu³⁺ phosphors and Lu₂O₂S:x%Eu³⁺ phosphors are at 800 ℃ for 2 h in air and at 500 ℃ for 2 h in a closed sulphuration atmosphere, respectively. On this basis, the photoluminescence (PL) behavior of the two prepared fluorescent powders was analyzed. At approximately 618 nm and 628 nm, lutetium based oxysulfate and oxysulfide phosphors exhibit typical red emission, which is the main luminescent feature of Eu³⁺, originating from the ⁵D₀-⁷F₂ transition of Eu³⁺.The CIE color coordinates of the Lu₂O₂SO₄:Eu³⁺ and Lu₂O₂S:Eu³⁺ phosphors correspond to (0.6573, 0.3423) and (0.621, 0.3769), respectively, and their colors are red-orange and orange light. The optimal doping concentration was determined to be 7.5%. The fluorescence lifetime of Lu₂O₂SO₄:7.5%Eu³⁺ and Lu₂O₂S:7.5%Eu³⁺ phosphors obtained by homogeneous precipitation method is 2.4479 ms and 1.004 ms. The CCT values are 2886 K and 1863 K, which belong to low penetration CCT light. They all have short afterglow life, and lutetium oxysulfate phosphor has longer fluorescence life than lutetium oxysulfide phosphor

Keywords: a general amorphous precursor, lutetium oxysulfate, lutetium oxysulfide, homogeneous precipitation, photoluminescence