Abstract

Yb3+/Er3+ co-doped nano-glass ceramics (GCs) containing isotropic KY3F10 nanocrystals (NCs) are obtained from a simple ternary oxyfluoride glass by controlled crystallization. The nano-GCs thus obtained, albeit having very large crystallinity of 35%, are ultratransparent in the whole visible-light wavelength region of 300–700 nm. Remarkably enhanced green upconversion luminescence (UCL) of Er3+ (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±0.02% in the GCs under 10W/cm2 power density. The UCL efficiency is comparable to that of the famous ZBLAN: Yb3+/Er3+ glass and GCs containing β-NaYF4:Yb3+/Er3+ NCs, and nearly twice as large as that of GCs containing KYF4:Yb3+/Er3+ NCs under the same excitation conditions.

© 2019 Optical Society of America

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