均相共沉淀法制备纳米ZnO:(Eu,Li)红色荧光粉的光致发光(英文)

以Zn(NO3)2·2H2O,Co(NH2)2,Eu(NO3)2·6H2O和LiNO3·2H2O为原料,采用均相共沉淀法制备了Eu,Li共掺的纳米ZnO:(Eu,Li)荧光粉.用扫描电镜、X射线衍射、热重-差示扫描量热分析等表征了样品的结构、形貌.研究了Eu与Li的摩尔比和煅烧温度对样品的发光性能的影响.结果表明:合成的ZnO:(Eu,Li)粉体具有六方纤锌矿结构的ZnO晶型,粒度分布均匀,粒径尺寸为20～40 nm.当Eu与Li的摩尔比为3:1时,700℃下煅烧2h的样品发光强度最高.在发射光谱中样品的发射峰位于570～620nm,其发射主峰位于61nm处,对应于Eu的5D0→7F2跃迁.

HOMOGENEOUS CO-PRECIPITATION SYNTHESIS AND PHOTOLUMINESCENCE OF NANO ZnO:(Eu, Li) PHOSPHOR WITH RED FLUORESCENCE

Eu, Li co-doped ZnO:(Eu, Li) nanopowders were synthesized by the homogeneous co-precipitation method usingv Zn(NO3)2·2H2O, CO(NH2)2, Eu(NO3)3·6H2O and LiNO3·2H2O as raw materials. The structure and morphology of the samples were characterized by scanning electron microscopy, X-ray diffraction and thermogravimetry-differential scanning calorimetry analysis.The effects of the mole ratio of Eu to Li and calcination temperature on photoluminescenee properties of samples were investigated.The results show that the ZnO:(Eu, Li) nanopowder is a pure hexagonal wurtzite sta'ucture of ZnO crystal. The particle sizes of the nanopowders are distributed uniformly in the range of 20-40 nm. When the mole ratio of Eu to Li is 3:1, the luminescence intensity of the nanopowder sample calcined at 700 ℃ for 2 h increases to the maximum. The emission peak of the nanopowders in the emission spectra are located at 570-620 nm, and the maximum emission peak is at 611 um with 463 nm excitation, corresponding to the 5D0→7F2 transition of Eu.