NaLa(MoO_4)_2∶Eu^(3+)的水热调控合成与发光特性研究

Hydrothermal controlled synthesis and luminescence properties of NaLa(MoO_4)_2:Eu^(3+) microcrystals

采用水热法合成了不同粒径的NaLa(MoO4)2∶Eu3+微晶.通过调节乙二醇浓度和反应时间,研究了NaLa(MoO4)2∶Eu3+微晶的形貌演变过程,在水热条件下180℃反应16h获得了均一梭子形NaLa(MoO4)2∶Eu3+微晶,其晶粒长度约为2.0μm.荧光光谱分析表明,Eu3+取代了NaLa(MoO4)2中La3+的格位,Eu3+在613nm处红光发射(5D0—7F2跃迁)的浓度猝灭机理是电偶极-电四极相互作用,并发生了Eu3+(5D1)+Eu3+(7F0)→Eu3+(5D0)+Eu3+(7F3)交叉弛豫,由此导致浓度猝灭.

Eu3＋ doped NaLa（MoO4）2 microcrystals with different sizes are synthesized by a mild hydrothermal method,and the morphologies of the microcrystals can be easily controlled by adjusting the volume ratio of ethylene glycol to water and the aging time.Uniform high-quality shuttle-like microcrystals with an average length of 2.0 μm are obtained under the hydrothermal condition of 180℃ for 16 h.From the emission spectra of NaLa（MoO4）2：Eu3＋ microcrystals,it is concluded that the dopant Eu3＋ ion occupies a La3＋ site.It is indicated that the concentration quenching of the emission peak at 613 nm of Eu3＋ is ascribed to the electric dipole-electric quadrupole interaction,and the cross relaxation process of Eu3＋（5D1） ＋ Eu3＋（7F0）→ Eu3＋（5D0） ＋ Eu3＋（7F3） appear.