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

Abstract 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. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)