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Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm 3+ . The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYb 3 F 10  nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb 3+  when the doping concentration varies from 0.5 to 1.5 mol%. Pure near-infrared upconversion emissions are observed and the emission intensities are enhanced in the glass-ceramics as compared to in the precursor glass due to the incorporation of Tm 3+  into the KYb 3 F 10  crystal structures via substitutions for Yb 3+ . Furthermore, KYb 2 F 7  crystals are also nano-crystallized in the glass-ceramics when the Yb 3+  concentration exceeds 2.0 mol%. The upconversion emission intensity of Tm 3+  is further enhanced by seven times as Tm 3+  enters the lattice sites of pure KYb 2 F 7  nanocrystals. The designed glass ceramics provide efficient gain materials for optical applications in the biological transmission window. Moreover, the controllable nano-crystallization strategy induced by Yb 3+  opens a new way for engineering a wide range of functional nanomaterials with effective incorporation of Ln 3+  ions into fluoride crystal structures.

Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb3+ for Efficient Near-Infrared Upconversion Luminescence of Tm3+