Crystal growth, layered structure and luminescence properties of KEu(PO)(WO).

KEu(PO)(WO) has been prepared the high-temperature solution growth (HTSG) method using KWO-KPO molten salts as a self-flux and characterized by single-crystal X-ray diffraction analysis, IR and luminescence spectroscopy. The structure of this new compound features a 2D framework containing [EuPO] layers, which are composed of zigzag chains of [EuO] interlinked by slightly distorted PO tetrahedra. Isolated WO tetrahedra are attached above and below these layers, leaving space for the K counter-cations. The photoluminescence (PL) characteristics (spectra, line intensity distribution and decay kinetics) confirm structural data concerning one distinct position for europium ions. The luminescence color coordinates suggest KEu(PO)(WO) as an efficient red phosphor for lighting applications.