Investigation of luminescent properties of Eu3+ doped double perovskite Ba2ZnMoO6 phosphors by using solid-state reaction method

Abstract

A series of double perovskite Ba2−2xEu2xZnMoO6 (where x = 0.02–0.12) phosphors with orange-reddish emitting light were successfully synthesized by solid-state reaction method at the synthesizing temperatures of 1000, 1050, and 1100 °C. The X-ray diffraction (XRD) patterns indicated that the crystalline phases of all synthesized Ba2−2xEu2xZnMoO6 powders had the double perovskite structure with the lattice of a = b = c = 0.8264 nm. As fluorescence spectrophotometer was used to measure photoluminescence (PL) properties of the Ba2−2xEu2xZnMoO6 phosphors, 3D scanning method was used to find the optimum excitation wavelength and it was 360 nm. PL emission spectra showed that the emitting light with the sharp peak in one strong band of 597 nm and the broadened peaks in two weak bands of 619 and 630 nm were observed for all the Ba2−2xEu2xZnMoO6 powders even different synthesizing temperatures were used. We had found that the strong emission peak of 597 nm was corresponding to 5D0–7F1 (597 nm) transition of Eu3+ ions and two weak emission peaks of 619 and 630 nm were corresponding to 5D0–7F2 (619 nm) and 5D0–7F2 (630 nm) transitions of Eu3+ ions. The results of XRD patterns and emission spectra suggest that the optimal synthesizing temperatures of the Ba2−2xEu2xZnMoO6 phosphors are 1100 °C. As 1100 °C is used as the synthesizing temperature, the relationship between the lifetime and the concentration of Eu3+ ions in the Ba2−2xEu2xZnMoO6 phosphors can be obtained by the equation: t = − 4.9 × u + 2.1894, where t and u represent an emitting lifetime of the Ba2−2xEu2xZnMoO6 phosphors and the concentration of Eu3+ ions.