Abstract

The upconverting luminescence properties of phosphors are dependent on the hosts. In this work, the ${\mathrm{WO}}_3\text{:}{\mathrm{Yb}}^{3+}$, ${\mathrm{Er}}^{3+}$ phosphor was prepared, and the reversible phase transformation from the ${\mathrm{WO}}_3$ to the ${\mathrm{WO}}_2$ was obtained by alternating the sintering in a reducing atmosphere or in air. The influence of reversible phase transformation on the upconversion luminescence was investigated first. The ${\mathrm{WO}}_3\text{:}{\mathrm{Yb}}^{3+}$, ${\mathrm{Er}}^{3+}$ phosphor exhibits the visible upconversion luminescence, while no upconversion luminescence was observed in the ${\mathrm{WO}}_2\text{:}{\mathrm{Yb}}^{3+}$, ${\mathrm{Er}}^{3+}$ phosphor. The reversible modulation of upconversion luminescence of the ${\mathrm{WO}}_3\text{:}{\mathrm{Yb}}^{3+}$, ${\mathrm{Er}}^{3+}$ phosphor retains the excellent reproducibility, exhibiting the potential applications in data storage and optical switches.

© 2018 Optical Society of America

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