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In this work, dot-sized upconversion nanocrystals (UCN-dots) with diameterc.a. 3.4-0.15 nm have been synthesized. These UCN-dots exhibit visible emission(at 497, 527 and 545 nm) under the excitation with 980 nm CW-NIR laser.Further, these UCN-dots exhibit high energy upconversion emission (UV region,206 to 231 nm) with Ti-Sapphire Femtosecond laser of 140-femtoseconds durationat 80 MHz repetition rate at different excitation, which has never beenreported. This is interesting to report that the generation of high energyUV-Vis emission and their shifting from 206 to 231 nm for the UCN-dots bytuning the excitation wavelength ranging from 950 nm to 980 nm irradiated fromTi: sapphire Femtosecond laser observed. We have demonstrated the generation ofhigh energy upconversions with change in energy band gaps as well as number ofabsorbed photons per photon emitted under the Femtosecond-laser excitationpower. Additionally, we report the photo luminescence of UCN-dots in visiblerange with 450 nm excitation wavelength exhibiting blue and red emission(visible to visible). The generation of high energy up-conversion in UV-Visregion could be useful for designing optoelectronic and biomedical devices fortherapeutic application.

Upconverting nanodots of nayf4yb3er3 synthesis characterization and uv visible luminescence study through ti sapphire 140 femtosecond laser pulses