Gd_2O_2SO_4∶Eu^(3+)亚微米棒的水热合成及发光性能

Hydrothermal Synthesis and Luminescent Properties of Gd_2O_2SO_4∶Eu^(3+) Sub-microrods

以Gd2O3、Eu2O3、H2SO4和NaOH为实验原料,采用水热法合成了Gd2O2SO4∶Eu3+亚微米棒。XRD和FT-IR分析表明,前驱体Gd2(OH)4SO4·nH2O通过水热合成和随后的热处理(900℃,2h)能转化成纯相Gd2O2SO4。FE-SEM显示,Gd2O2SO4粉体具有边长500～800nm、长度大于10μm的亚微米棒状结构。PL光谱分析表明,在270nm紫外光激发下,Gd2O2SO4∶Eu3+的主发射峰位于618nm,呈现红光发射,归属于Eu3+的5D0→7F2跃迁,其跃迁具有单指数衰减行为,荧光寿命为1.13ms。

Gd2O2SO4 ： Eua＋ sub-microrods are synthesized by hydrothermal synthesis using Gd2O3, Eu2O3 , H2SO4 and NaOH as starting materials. XRD and FT-IR show that the Gd2 （OH）4SO4·nH2O precursor can be transformed into pure Gd2O2 SO4 phase by hydrothermal synthesis and subsequent heat treatment（900℃ for 2h）. FESEM images indicate that the Gd2O2SO4 phosphors are sub-microrods with a side length of 500-800nm and a length of more than 10μm. PL spectra reveals that the strongest red emission peak of Gd2O2 SO4：Eu3＋ sub-microrods is located at 618nm under 270nm ultraviolet light excitation, which correspond to the a D0→7F2 transition of Eu3＋. And the 5D0→7F2 transition of Eu3＋ has a single exponential decay behavior with a corresponding lifetime of 1.13ms.