微乳液法合成的Eu3+掺杂La2（MoO4）3材料及其发光性能

摘要

La2 ( MoO4 ) 3 micro-materials with different morphologies were prepared by microemulsion reaction of sodium molybdate (Na2MoO4·2H2O) and lanthanum nitrate(La(NO3)3·6H2O) un-der the help of micro emulsion system. The morphology of La2 ( MoO4 ) 3 samples gradually transform from oval shape to close spherical shape with the concentration of the surfactant of CTAB increasing from 0.2 mol/L to 0.4 mol/L. Under 396 nm excitation, La2(MoO4)3∶Eu3+samples calcined at 800 ℃ for 4 h emit 617 nm red light due to the forced electric dipole transition of 5 D0→7 F2 . The emission is strongest when the mole fraction of Eu3+ is up to 20%.%在微乳体系(十六烷基三甲基溴化氨/水/戊烷/戊醇)协助下,采用钼酸钠和硝酸镧通过微乳反应制备了具有不同微结构的La2(MoO4)3。在表面活性剂CTAB浓度由0.2 mol/L增加到0.4 mol/L的过程中,La2-( MoO4)3的结构由蚕蛹状逐渐转变成近球形。经800℃煅烧处理4 h后的La2( MoO4)3∶Eu3+材料通过396 nm紫外光激发,发射出由5 D0→7 F2的受迫电偶极跃迁产生的波长为617 nm红光,且当Eu3+掺杂摩尔分数达到20%时,发光强度达到最大。