Abstract

UVC upconversion emission is observed in a ${\mathrm{LiYF}}_4\text{:}{\mathrm{Pr}}^{3+}$ microcrystal under sunlight excitation. The dependence of UVC UC emission intensity on the excitation density of a 488 nm laser and sunlight is investigated. The obtained data indicates that two-photon processes play an important role in UVC UC emission. The UVC UC mechanisms of ${\mathrm{Pr}}^{3+}$ under the excitation of a laser and sunlight are presented and discussed. The UVC emission under sunlight excitation has broad prospects for application.

© 2016 Optical Society of America

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