Additives and solvents-induced phase and morphology modification of NaYF4 for improving up-conversion emission

作者：Zhuang, Jianle^*; Yang, Xianfeng; Wang, Jing; Lei, Bingfu; Liu, Yingliang; Wu, Mingmei^*

来源：Journal of Solid State Chemistry, 2016, 233: 178-185.

DOI：10.1016/j.jssc.2015.10.027

• NaYF4
• Hydro/solvo-thermal
• Phase transformation
• Up-conversion

Both cubic and hexagonal NaYF4 were synthesized in different reaction systems via hydro/solvo-thermal route. The effects of reaction temperature, solvents, and additives on the synthesis of NaYF4 have been studied in detail. It has been shown that phase transformation from cubic NaYF4 to hexagonal NaYF4 always occurred. The sequence of the ability for inducing the phase transformation was ethanol > H2O > acetic acid. It is found that ethanol can not only facilitate the formation of hexagonal NaYF4 but also control the growth of the crystal. This is quite unusual for the growth of H-NaYF4. The up conversion emission properties of Yb/Er co-doped NaYF4 have also been investigated and the results demonstrated some general principles for improving up-conversion emission.

• 出版日期2016-1
• 单位中山大学; 华南农业大学