Abstract

With a specially designed composition, highly transparent ${\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$-doped fluorosilicate glass ceramic (GC) containing ${\mathrm{KMnF}}_3$ perovskite nanocrystals (NCs) is obtained for the first time. The rare-earth ions are preferentially accumulated in regions embedded with ${\mathrm{KMnF}}_3$ NCs; as a result, a remarkably enhanced (by an order of magnitude) single-band red upconversion luminescence (UCL) is achieved. Absolute quantum efficiency of the red UCL, which cannot be measured in previous GCs owing to insufficiency, reaches as high as $0.10\%\pm 0.02\%$ in the GC sample reported in this Letter. This value is even higher than that of the well-known multiband emitting $\beta \text{-}{\mathrm{NaYF}}_4\text{:}{\mathrm{Er}}^{3+}/{\mathrm{Yb}}^{3+}$ NCs and widely recognized GCs containing ${\mathrm{NaYF}}_4\text{:}{\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}\mathrm{NCs}$.

© 2019 Optical Society of America

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