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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+))]}。
Eu 3+ ion-doped La 2 (MoO 4) 3: Eu 3+ nanoparticles were synthesized by solvothermal method using lanthanum nitrate hydrate, europium nitrate hydrate, stearic acid and sodium hydrous molybdate as reactants Red phosphor. The morphology, structure and luminescent properties were characterized by TEM, XRD and FL. The effects of solvent type, reaction time, reaction temperature and Eu ~ (3 +) doping on the microstructure and luminescent properties of the product were investigated. The results showed that the sample obtained under the condition of isopropanol as solvent, reaction temperature 180 ℃ and reaction time 12 h had high crystallinity, good dispersibility and homogeneous morphology with particle size less than 100 nm. The sample can be effectively excited by near-UV light (wavelength 391.0 nm) and blue light (wavelength 462.5 nm) with the maximum emission wavelength at 613.5 nm, which is a narrow-band red light. The emission intensity of La_2 (MoO_4) _3: Eu ~ (3+) is related to the doping amount of Eu ~ (3+) ions. The optimum doping mole fraction xEu ~ (3 +) = 0.15 {xEu ~ (3+) = n (Eu ~ (3 +)) / [n (Eu ~ (3 +)) + n (La ~ (3+))]}.