A new bluish white-emitting phosphor based on a phosphate host matrix, CdBaP2O7:Eu2+, was prepared by a conventional solid-state reaction method. The photoluminescence properties were investigated in both ultraviolet (UV) and vacuum ultraviolet (VUV) regions. The band-gaps of Eu-doped CdBaP2O7 powders can be tuned in the ranges of 2.26–2eV. The Eu2+-doped CdBaP2O7 phosphor was efficiently excited at wavelengths of 250–400nm, which is suitable for the blue emission band for near-UV light-emitting-diode (LED) chips (360–400nm) and red emission peaks up to 700nm. CdBaP2O7:Eu2+ displays two different luminescence centers, which were suggested to Ba2+ and Cd2+ sites in the host. The dependence of luminescence intensity on temperatures was measured. The chromaticity coordinates and activation energy for thermal quenching were reported. The phosphor shows a good thermal stability on temperature quenching.
Journal of Luminescence – Elsevier
Published: Aug 1, 2016
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