Abstract

Under 980nm excitation, Eu3+Tm3+Yb3+ tri-doped YF3 nanocrystals emitted ultraviolet and visible fluorescence. Besides the upconversion emissions from Tm3+ ions, not only were the unusual D25F37, D35FJ7 emissions of Eu3+ observed, but also the ultraviolet upconversion luminescence of Eu3+ from H375, G265, L65F07 transitions were recorded. This unique optical property was attributed to the bridging function of Tm3+ ions in populating high-energy states of Eu3+ ions.

© 2009 Optical Society of America

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