Infrared-to-visible and infrared-to-violet up fluorescence of rare earth doped LaF3 nanocrystals

• 来源期刊: 中国物理B（英文版）
• 关键词: upconversion fluorescence infrared-to-visible infrared-to-violet nanocrystals
• 年，卷（期）: 2008,（9）
• 页码范围: 3300-3305
• 页数: 6页
• 语种: 英文

摘要

This paper reports that hexagonal-phase LaF3:Yb3+0.20,Er3+0.02 and LaF3:Yb3+0.20,Tm3+0.02 nanocrystals(NCs)were synthesized via a hydrothermal method.The transmission electron microscopy,selected area electron diffraction,powder x-ray diffraction,and thermogravimetric analysis are used to characterize the NCs.Under 980 nm excitation,the Yb3+/Er3+and Yb3+/Tm3+codoped NCs colloidal solutions present bright green and blue upconversion fluorescence,respectively.These NCs show efficient infrared-to-violet and infrared-to-visible upconversion.The upconversion fluorescence mechanisms of LaF3:Yb3+0.20,Er3+0.02 and LaF3:Yb3+0.20,Tm3+0.02 NCs are investigated with a 980-nm diode laser as excitation source.