Self-activated luminescent material K3Dy(PO4)2: Crystal growth, structural analysis and characterizations

A potassium dysprosium orthophosphate K3Dy(PO4)2 has been prepared using high temperature flux method and structurally characterized by single crystal X-ray diffraction (SC-XRD) analysis. Its structure features a two-dimensional (2D) layer structure that is composed of [Dy(PO4)2]∞ anionic layers and K∞ cationic layers alternatively stacking along the a-axis. The diverse excitation and emission photoluminescence spectra, fluorescence lifetime and color CIE coordinates for K3Dy(PO4)2 were discussed. Although with high Dy3+ concentration, the emission spectrum excited at 350 nm shows strong green-yellow emission bands corresponding to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+ ions, respectively. The results show that K3Dy(PO4)2 can be potentially used as a green-yellow phosphor for fields of near UV-excited white-light-emitting diode and optoelectronic devices.