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A series of Sm3+-doped La3Si6N11 phosphor materials were synthesized by a high temperature solid-state reaction method.The crystal structure,microstructure,photoluminescence properties,decay curves as well as thermal quenching properties of the as-prepared phosphors were investigated systematically.The excitation spectra contain a wide asymmetric band below 350 nm originating from the host ab-sorption,several sharp excitation peaks in the range of 300-550 nm corresponding to f-f transition of Sm3+.Under the excitation of 369 and 414 nm light,the phosphors exhibit strong narrow-band orange-red emission peaked at 605 nm.The average decay time of La2.99Si6N11∶0.01Sm3+sample is fitted to be 0.38 ms and the CIE coordinates were calculated to be(0.6105,0.3833).For water resistance,La3Si6N11∶Sm3+is better than K2SiF6∶Mn4+phosphor.After soaking in deionized water for 300 min,the La3Si6N11∶Sm3+sample retains approximately 80％of its initial relative emission intensity.When the temperature rises to 423 K(150 ℃),the emission intensity of La2.99Si6N11∶0.01Sm3+sample remains 85％in comparison to that of room temperature.The activation energy was calculated to be 0.63253 eV,which is higher than those of Sm3+-activated oxide phosphors,indicating that the phosphor has relatively good thermal stability.