Abstract
UVC upconversion emission is observed in a 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 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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