球形NaLa(MoO_4)_2∶Eu^(3+)的微波辐射合成与发光性能

Synthesis and luminescence property of NaLa(MoO_4)_2∶Eu^(3+) spheres by microwave irradiation

利用微波辐射加热的方法合成了均匀的球形NaLa(MoO4)2粉体颗粒,研究了CTAB对粉体形貌的影响,并用激光粒度仪测定了其粒径分布.结果表明:CTAB改善了粉体形貌,球形颗粒的均一性也得到了提高.当CTAB的加入量为20 mmol·L-1时颗粒分布窄,中心粒径D50=0.854μm,有利于在芯片基底上形成致密的荧光粉涂层.使用XRD,TEM和EDS测定了结构和成分,表明粉体颗粒为纯四方相的NaLa(MoO4)2多晶颗粒,且未检测到杂质元素的存在.NaLa(MoO4)2:Eu3+的室温光致发光谱表明了样品可以被紫外、近紫外和蓝光有效激发,从而发射波长为616 nm的高强度红光,使其在LED领域有潜在的应用价值.

Uniform NaLa（ MoO4 ）2 powders with spherical shape were synthesized by microwave irradia- tion. The influence of CTAB concentration on the particle morphology was investigated, and the particle size was measured by laser particle size analyzer. The results show that the morphology and homogeneity of the spherical particles are improved by CTAB. The particle size distribution is very narrow with D50 of 0. 854 μm when CTAB concentration is 20 mmol · L^-1, and it is good for dense layer of phosphor on substrate. The sample structure and composition were determined by XRD, TEM and EDS. The results show that NaLa（ MoO4 ）2 has pure tetragonal phase with polycrystalline nature, and no other impurity is detected. Room temperature photoluminescence measurement of NaLa （MoO4）2： Eu^3＋ shows that the sample can be effectively excited by UV, near-UV and blue light, and gives strong red emission at 616 nm. The red phosphor can be potentially applied in light-emitting diodes.