YbF2.357, YbF3, Ba2YbF7, and BaF2upconversion nanocrystals doped with emitter Er3+ion were synthesized in thesame solvent system just with changing the molar ratio of Ba2+to Yb3+in the precursor, which corresponed to the crystal phases of rhom-bohedral, orthorhombic, tetragonal, and cubic, respectively. All the samples emittedboth 660 nm red light and 543/523nm green light which originatedfrom Er3+-4fnelectronic transitions4F9/2-4I15/2and4S3/2/2H11/2-4I15/2, respectively.It was worth mentioning that YbF3:Er3+, Ba2YbF7:Er3+, and BaF2:Er3+couldemit dazzlingly bright light even under the excitation of a 980 nm CW laser with out-put power of 0.1 W. Upconversion emission mechanism analysis indicatedthat the intensity ratio of red to green light highly depend-ed on the synergistic effect of crystal structure, concentration quenching, and particle size, butwerenot sensitive to crystallinity as previously reported for NaLnF4(Ln=lanthanide).
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