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The luminescence characterization and structure of Eu2 + doped LiMgPO4

An Eu2 + -doped LiMgPO4 phosphor was prepared by a high temperature solid-state reaction. The formation was confirmed by x-ray powder diffraction measurements to be a single LiMgPO4 phase. The photoluminescence excitation and emission spectra were investigated. The luminescence shows a broad emission from the transition at room temperature. At low temperature the zero-phonon line for transitions to the 4f7 (8S7/2) level of the 4f6(7Fj)5d1 excited state is observed at 360 nm and it is found that the emission line of the transition overlaps the zero-phonon line at nearly the same position of 360 nm. The influences of temperature on the luminescence spectra and decay times were investigated. The doping mechanism of Eu2 + ions in LiMgPO4 was discussed. The Eu2 + ions were suggested to occupy the Li + sites in LiMgPO4 to induce the small crystal field splitting and weak nephelauxetic effect.