Synthesis of monodispersed hierarchical Yb(OH)xF3−x microcrystals and their conversion to Yb6O5F8

作者：Jianle Zhuang; Wan Zhou; Huihong Lin; Ziran Huang; Yijin Cai; Bingfu Lei; Haoran Zhang; Yingliang Liu

来源：Materials Research Bulletin, 2017, 94: 489-492.

• Crystal growth
• Phosphors
• Microstructure
• Optical properties

The fabrication of rare earth luminescent materials with monodispersed and hierarchical morphology is of great importance due to their various applications. In this report, monodispersed hierarchical Yb(OH)xF3−x microcrystals assembled by nanorod arrays were synthesized by a mild hydrothermal route. Calcination of Yb(OH)xF3−x resulted in the formation of Yb6O5F8 with the retention of morphology. The crystallographic structure relationship between Yb(OH)xF3−x and Yb6O5F8 and the transformation mechanism from Yb(OH)xF3−x to Yb6O5F8 were disclosed. The upconversion emission properties of the Er3+ doped samples were investigated. It can be found that Yb6O5F8: 5%Er3+ exhibited an intense red light upconversion emission with the strongest peaks around 658 nm while Yb(OH)xF3−x: 5%Er3+ shows no upconversion emission.