${\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$ co-doped nano-glass ceramics (GCs) containing isotropic ${\mathrm{KY}}_3{\mathrm{F}}_{10}$ nanocrystals (NCs) are obtained from a simple ternary oxyfluoride glass by controlled crystallization. The nano-GCs thus obtained, albeit having very large crystallinity of $\sim 35\%$, are ultratransparent in the whole visible-light wavelength region of 300–700 nm. Remarkably enhanced green upconversion luminescence (UCL) of ${\mathrm{Er}}^{3+}$ (by 55 times) is observed in the nano-GCs as compared to the precursor glass. Absolute quantum efficiency of the green UCL reaches as high as $0.41\pm 0.02\%$ in the GCs under $10\mathrm{W}/{\mathrm{cm}}^2$ power density. The UCL efficiency is comparable to that of the famous ZBLAN: ${\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$ glass and GCs containing $\beta \text{-}{\mathrm{NaYF}}_4\text{:}{\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$ NCs, and nearly twice as large as that of GCs containing ${\mathrm{KYF}}_4\text{:}{\mathrm{Yb}}^{3+}/{\mathrm{Er}}^{3+}$ NCs under the same excitation conditions.

中文翻译：

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含有各向同性KY ₃ F ₁₀纳米晶体的高度结晶的超透明纳米玻璃陶瓷中的高效绿色上转换发光

$b^{3+}/{尔}^{3+}$ 包含各向同性的共掺杂纳米玻璃陶瓷（GC） $Y_3{\mathrm{F}}_{10}$纳米晶体（NCs）是通过控制结晶从简单的三元氟氟化玻璃中获得的。由此获得的纳米GC尽管具有非常大的结晶度。$〜35％$在整个300-700 nm的可见光波长范围内都是超透明的。显着增强了绿色的上转换发光（UCL）${尔}^{3+}$与前体玻璃相比，在纳米气相色谱仪中观察到（55倍）。绿色UCL的绝对量子效率高达$0.41\pm 0.02％$ 在GC下 $10\mathrm{w\; ^}/{\mathrm{厘米}}^{\mathrm{2个}}$功率密度。UCL的效率与著名的ZBLAN相当：$b^{3+}/{尔}^{3+}$ 玻璃和含有GC的GC $\beta \text{--}{\mathrm{NaYF}}_4\text{：}{b}^{3+}/{尔}^{3+}$ NC，几乎是包含以下内容的GC的两倍 ${\mathrm{肯尼迪}}_4\text{：}{b}^{3+}/{尔}^{3+}$ NC在相同的激励条件下。