Abstract:The effect of Eu 2 O 3 concentration on the luminescence properties of double perovskite (cubic) Sr 2−x Eu x ZnMoO 6 phosphors was thoroughly investigated using different synthesizing temperatures. Phosphors with the composition Sr 2−x Eu x ZnMoO 6 , where Eu 2 O 3 was substituted for SrO and x was changed from 0 to 0.12, were synthesized by the solid-state method at temperatures of 900-1200 • C, respectively. Analysis of the X-ray diffraction (XRD) patterns showed that even when the synthesizing temperature was 1100 • C, secondary or unknown phases were observed in Sr 2−x Eu x ZnMoO 6 ceramic powders. The effect of the concentration of Eu 3+ ions on the luminescence properties of the Sr 2−x Eu x ZnMoO 6 phosphors was readily observable because no characteristic emission peak was observed in the Sr 2 ZnMoO 6 phosphor. Two characteristic emission peaks at 597 and 616 nm were observed, which correspond to the 5 D 0 -7 F 1 and 5 D 0 -7 F 2 transitions of Eu 3+ ions, respectively. The two characteristic emission peaks of the Sr 2−x Eu x ZnMoO 6 phosphors were apparently influenced by the synthesizing temperature and the concentration of Eu 3+ ions. When x was larger than 0.08, a concentration quenching effect of Eu 3+ ions in the Sr 2−x Eu x ZnMoO 6 phosphors could be observed. The lifetime of the Sr 2−x Eu x ZnMoO 6 phosphors decreased as the synthesizing temperature increased. A linear relation between temperature and lifetime was obtained by using a fitting curve of t = −0.0016 × T + 3.543, where t was lifetime and T was synthesizing temperature.