Abstract
This paper reports that hexagonal-phase LaF3:Yb0.203+, Er0.023+ and LaF3:Yb0.203+, Tm0.023+ 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 La F3:Yb0.023+ Er0.023+ and LaF3:Yb0.023+, Tm0.023+ NCs are investigated with a 980-nm diode laser as excitation source.
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