(1. 贵州师范大学 化学与材料科学学院，贵阳 550001；
2. 贵州省功能材料化学重点实验室，贵阳 550001；
3. 贵州师范大学 职业技术学院，贵阳 550001)
摘 要: 采用高分子网络凝胶法合成Eu3+掺杂LaP3O9 发光材料，并通过X射线衍射(XRD)、 荧光光谱和傅里叶变换红外光谱(FT-IR)等对合成产物的物相结构和光学性能进行研究，并对部分合成工艺条件、Eu3+离子掺杂量等对合成产物的物相结构及发光性能的影响进行分析。结果表明：采用高分子网络凝胶法可制备单一相的正交晶系空间群为C2221的LaP3O9:Eu3+晶体。LaP3O9:Eu3+样品在紫外光的激发下发射出Eu3+的特征光，且Eu3+掺杂量直接影响着LaP3O9:Eu3+样品的发光强度，但在Eu3+掺杂量高达10%时(摩尔分数)也未能观察到浓度猝灭现象。合成工艺条件显著影响着合成产物的发光性能，在反应体系pH为4的条件下制备湿凝胶，并于850 ℃下煅烧6 h可获得发光性能较优的产物。
关键字: 高分子网络凝胶法；LaP3O9:Eu3+；结构；光学性能
（1. School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China;
2. Key Laboratory for Functional Materials Chemistry of Guizhou Province, Guiyang 550001, China;
3. Vocational and Technical College, Guizhou Normal University, Guiyang 550001, China）
Abstract:LaP3O9:Eu3+ phosphors were synthesized by polyacrylamide gel method. The crystal structure and optical properties of the as-synthesized samples were investigated by XRD, FT-IR and FL. The influences of synthesis conditions and Eu3+ doping content on the crystal structure and optical properties of the as-prepared samples were also discussed. The results exhibit that single-phase orthorhombic structure LaP3O9:Eu3+ crystals with space group C2221 can be obtained by polyacrylamide gel method. The photoluminescence spectra show characteristic orange-red emission of Eu3+ under ultraviolet light excitation. The doping content of Eu3+ plays a key role in the emission intensities of LaP3O9:Eu3+ crystals. The concentration quenching phenomenon can not be observed even though the doping content reaches 10% (mole fraction). The results reveal that the synthesis conditions have significant influence on the optical properties of the samples. When the calcination temperature is 850 ℃, calcination time is 6 h and pH is 4, the as-prepared sample displays excellent luminescence properties.
Key words: polyacrylamide gel method; LaP3O9:Eu3+; structure; optical property
