La_2(MoO_4)_3:Eu^(3+)纳米红色荧光粉的合成及其发光特性

Synthesis and Luminescence Properties of La_2(MoO_4)_3: Eu^(3+) Red Nano-Phosphors

以水合硝酸镧、水合硝酸铕、硬脂酸和水合钼酸钠为反应物,采用溶剂热法合成了Eu^(3+)离子掺杂的La_2(MoO_4)_3:Eu^(3+)纳米红色荧光粉。利用TEM、XRD、FL对其形貌、结构和发光性能进行了表征。考察了溶剂种类、反应时间、反应温度、Eu^(3+)掺杂量对产物微观形貌和发光性能的影响。结果表明:以异丙醇为溶剂、反应温度180℃、反应时间12 h条件下,得到的样品结晶度高、分散性好、形貌均一,粒径小于100 nm。该样品可被近紫外光(波长391.0 nm)和蓝光(波长462.5 nm)有效激发,最大发射波长位于613.5 nm,为窄带的红光。La_2(MoO_4)_3:Eu^(3+)的发光强度与Eu^(3+)离子掺杂量有关,其最佳掺杂摩尔分数xEu^(3+)=0.15{xEu^(3+)=n(Eu^(3+))/[n(Eu^(3+))+n(La^(3+))]}。

Red nano-phosphors,La_2（MoO_4）_3： Eu^（3＋）,were synthesized by solvothermal method using lanthanum stearate and europium stearate as starting materials. Transmission electron microscopy（TEM）,X-ray diffraction（XRD）,and fluorescence spectroscopy were employed to characterize the obtained products. The effects of solvent,reaction time,reaction temperature,and doping concentration of Eu^（3＋）ions on the morphology and luminescence properties of La_2（MoO_4）_3： Eu^（3＋）were investigated.The results indicated that La_2（MoO_4）_3： Eu^（3＋）with an average size of the samples less than 100 nm were obtained at 180 ℃ for 12 h using isopropyl alcohol as the solvent. The resulting sample exhibited high degree of crystallinity,good dispersibility,and uniform morphology. La2（MoO_4）3： Eu^（3＋）can be effectively excited by near ultraviolet（391. 0 nm） and blue light（462. 5 nm）,and exhibited narrow red emission peak at about 613. 5 nm. In addition,the luminous intensity of La_2（MoO_4）_3： Eu^（3＋）was related to doping concentration of Eu^（3＋）ion,and the optimal doping concentration of Eu^（3＋） ions was 0. 15（mole fraction）.