Abstract

Under $980\mathrm{nm}$ excitation, ${\mathrm{Eu}}^{3+}∕{\mathrm{Tm}}^{3+}∕{\mathrm{Yb}}^{3+}$ tri-doped $\mathrm{Y}{\mathrm{F}}_3$ nanocrystals emitted ultraviolet and visible fluorescence. Besides the upconversion emissions from ${\mathrm{Tm}}^{3+}$ ions, not only were the unusual ${}^{5}D_2\to {}^{7}F_3$, ${}^{5}D_3\to {}^{7}F_J$ emissions of ${\mathrm{Eu}}^{3+}$ observed, but also the ultraviolet upconversion luminescence of ${\mathrm{Eu}}^{3+}$ from ${}^{5}H_{3–7}$, ${}^{5}G_{2–6}$, ${}^{5}L_6\to {}^{7}F_0$ transitions were recorded. This unique optical property was attributed to the bridging function of ${\mathrm{Tm}}^{3+}$ ions in populating high-energy states of ${\mathrm{Eu}}^{3+}$ ions.

© 2009 Optical Society of America

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