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Pumped with a 980-nm diode laser, violet/ultraviolet upconversion fluorescence was presented in Y 0.83 Yb 0.15 Er 0.02 F 3 nanocrystals. Observed emissions at 318nm and 379nm were affirmed coming from a four-photon excitation process. In comparison with a bulk sample having the same chemical compositions, the nanocrystals had a markedly enhanced ability of emitting...
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