Eu2+-doped CsMgPO4 phosphors were synthesized by the conventional high-temperature solid-state reaction. The phase formations of the phosphors were confirmed by X-ray powder diffraction measurements. The photoluminescence excitation and emission spectra, the temperature dependent (10-300 K) luminescence intensities and the decay curves of the phosphor were measured. The Eu2+-doped CsMgPO4 shows a red emission band peaking at around 650 nm from 4f(6)5d(1)-> 4f(7) transitions of Eu2+ ions. The luminescence nature of CsMgPO4:Eu2+ is greatly different from the other Eu2+ doped ABPO(4) orthophosphates (A and B are mono-and divalent cations, respectively) and is characterized by the red-shifted emission, the larger Stokes shift and a lower luminescence quenching temperature. The anomalous luminescence properties of CsMgPO4:Eu2+ are ascribed to impurity trapped exciton emission. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3603971] All rights reserved.