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Novel nanometer-sized ScAlMgO4：Eu3+phosphors were successfully synthesized by the citric acid complexation method.The mean particle size of the obtained powders was within the range of 100～150 nm according to the SEM patterns.In ScAlMgO4：Eu3+showed strong characteristic red emission,of which the maximum emission peak was located at 629 nm for ultraviolet(UV)excitation.The dependence of photoluminescence intensity on Eu3+concentration was also studied in detail,and the emission intensity of Sc1-xEuxAlMgO4 was about 10% at optimized Eu3+concentration.Furthermore,the luminescence decay measurements showed that the lifetimes of Eu3+were in the range of millisecond.The obtained ScAlMgO4：Eu3+phosphors with nanometer size and excellent luminescence efficiency would be potential red phosphors in plasma display panels.