Investigation of Ce3+-doped Na3Mo1-xWxO4F and Na2Mo1-xWxO4 as Novel Phopshor Materials

Preliminary studies suggest that Na₃FMo_1-xW_xO₄ (0 ≤ x ≤ 1) is a new family of self-activating oxyfluoride phosphors with anti-perovskite related structure [1]. These materials are isostructural with the known sodium tungsten oxyfluoride Na₃FWO₄ [2], as determined by Rietveld analysis based upon neutron powder diffraction data of the molybdenum-containing analogues Na₃FMoO₄ and Na₃FW_0.5Mo_0.5O₄. Photoluminescence studies have shown that upon excitation with λ = 254nm and λ = 365nm, the end members Na₃FWO₄ and Na₃FMoO₄ exhibit broad emission maxima centred around 485 nm and 450 nm respectively  Mixed intermediates of the general formula Na₃FW_1‑xMo_xO₄ have a broad absorption around λ = 350-365 nm in the near-UV region which is close to the emission from pure GaN LEDs (370 nm) thus may provide novel host lattices for new PC-LED phosphors.

References:

1. E. C. Sullivan, M. Avdeev, and T. Vogt, Manuscript in preparation.

2. I. Hartenbach and T. Schleid, Z. Anorg. Allg. Chem., 633, 4, 524-526, 2007.