分别采用高温固相法和溶胶凝胶法合成了LiMgPO4和LiMgPO4∶Dy，通过热重-差热热分析仪、X射线衍射仪、傅里叶红外光谱仪、场发射高倍扫描电镜、紫外可见分光光度计和荧光分光光度计研究了不同合成方法对LiMgPO4∶Dy晶体结构、形貌和发光性能的影响。结果表明，溶胶凝胶法的最低合成温度为750 ℃且晶体中几乎不存在其他晶相，而高温固相法在950 ℃合成的晶体中仍然存在少量Mg3(PO4)2晶相；相比于高温固相法，溶胶凝胶法合成的样品形貌比较规则；两种方法合成的样品在可见光区域光吸收能力差，而在紫外区域高温固相法合成的样品光吸收能力明显较高；高温固相法合成的LiMgPO4∶Dy光学带隙范围为3.76~3.93 eV，溶胶凝胶法合成的LiMgPO4∶Dy光学带隙范围为3.85~3.94 eV，合成方法对样品的光学带隙影响较小。LiMgPO4∶Dy的最佳激发波长为350 nm，最强发射峰位于579 nm处，相比于高温固相法，溶胶凝胶法合成样品的发光强度更好。

LiMgPO4 and LiMgPO4∶Dy were synthesized by high-temperature solid-state method and sol-gel method. The effects of different synthesis methods on crystal structure, morphology and luminescence properties of LiMgPO4∶Dy were studied using thermogravimetry-differential thermal analyzor, X-ray diffractometer, Fourier transform infrared spectrometer, scanning electron microscope, ultraviolet-visible spectrophotometer and fluorospectro-photometer. The results show that the lowest synthesis temperature by sol-gel method is 750 ℃ and no other crystal phases are found in the crystal, while a small amount of Mg3(PO4)2 crystal phases are found in the sample synthesized by high-temperature solid-state method at 950 ℃. The morphology of the samples synthesized by sol-gel method is better than that synthesized by high-temperature solid-state method. Samples synthesized by both methods show low absorbance in the visible region. In the ultraviolet region, the absorbance of the sample synthesized by high-temperature solid-state method is higher than that synthesized by sol-gel method. The optical band gap range of LiMgPO4∶Dy synthesized by high-temperature solid-state method is 3.76~3.93 eV, and that of LiMgPO4∶Dy synthesized by sol-gel method is 3.85~3.94 eV. The synthesis method has little effect on the optical band gap of the sample. The optimal excitation wavelength of LiMgPO4∶Dy is 350 nm, and the strongest emission wavelength is 579 nm. The luminescence intensity of the samples synthesized by sol-gel method is better than that synthesized by high-temperature solid-state method.