中空LaF_3:Tb纳米晶的水热法制备与光谱性能研究

Hydrothermal Synthesis and Spectroscopic Properties of Hollow LaF_3:Tb Nanocrystals

采用水热法制备了中空LaF3∶Tb纳米晶。通过X射线粉末衍射(XRD)、透射电子显微镜(TEM)和紫外激发荧光光谱等测试表征手段,研究了水热合成温度、反应原料配比等物理化学条件对合成LaF3∶Tb粒子晶粒尺寸、形貌、分散状态以及发光性能的影响。实验结果表明,在水热温度180℃且当Tb3+的掺杂浓度为20 mol%时具有最强的荧光发射,其主发光峰位于542 nm的绿光区域。高分辨透射电镜分析发现,通过调节制备条件可合成具有中空结构的纳米LaF3颗粒,其颗粒尺寸仅为30～40 nm左右。

Hollow LaF3： Tb nanocrystals were prepared by hydrothermal synthesis processing. The effects of reaction temperatures, reaction materials proportion on luminescent properties, size and morphology of obtained LaF3 nanocrystals were characterized by XRD, TEM, and UV fluorescent spectrum. The results indicated that under hydrothermal conditions of 180 ℃ for 2 h, the obtained LaF3 nanocrystallines doped with 20 mol % of Tb3＋ exhibited the highest luminescence intensity at wavelength of 542 nm. Furthermore, the HRTEM images indicated that nanosized LaF3 grain with a hollow structure can be prepared by adjusting the synthesis conditions, the typical particle size is about 30-40 nm.