Novel pure Ca2ZnMoO6 composition with white‐light luminescence

Phosphors with composition Ca₂ZnMoO₆ were synthesized at temperatures of 800–1200°C using the solid‐state method. Analysis of X‐ray diffraction patterns of the Ca₂ZnMoO₆ powders did not reveal a double perovskite structure. When the synthesis temperature was equal to or higher than 800°C, the synthesized Ca₂ZnMoO₆ powders revealed a tetragonal structure (CaMoO₄) rather than an orthorhombic structure (Ca₂ZnMoO₆) and the cubic structure (Sr₂ZnMoO₆) of a double perovskite. The ZnO phase was still observed at a synthesis temperature of 1200°C. The compositions of synthesized Ca₂ZnMoO₆ powders differed from the prepared powder, and the Ca₂ZnMoO₆ phosphors exhibited some important novel features. First, synthesized Ca₂ZnMoO₆ compositions could emit light as a phosphor no activators, called Ca₂ZnMoO₆ phosphors. Effect of synthesis temperature on luminescence properties of these Ca₂ZnMoO₆ phosphors was readily observed, and some important novel features and properties were noted. Second, the phosphors presented only one broad characteristic emission peak in the visible light region. Third, measurement of the chromaticity diagram of the Ca₂ZnMoO₆ phosphors revealed a white‐light source. Through analysis, we determined why the synthesized Ca₂ZnMoO₆ phosphors had just one broad characteristic emission peak.