Long-lasting phosphorescence properties of Mn2+-doped Cd2Ge7O16 orange light-emitting phosphor

A new phosphor, Cd2Ge7O16:Mn2+, which emits orange-coloured long-lasting phosphorescence upon UV light excitation, was prepared by the conventional high-temperature solid-state method and its luminescent properties were systematically investigated. X-ray diffraction, photoluminescence and thermoluminescence spectra and lifetime decay curves were used to characterize the synthesized phosphor. This phosphor is well-crystallized by calcination at 950 C for 6 h and shows excellent performance. After irradiation under 258 nm UV light, this phosphor emits a broad band centred at 585 nm and shows obvious long-lasting phosphorescence. The colour coordinate values of this phosphor are x=0.56, y=0.46. (copyright 2008 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)