Abstract
AbstractTransparent glass‐ceramics with composition of 95SiO2–5LaF3 doped with 0.1 mol% of Ho3+ or co‐doped with 0.1 mol% of Ho3+ and 0.3 mol% of Yb3+ were synthesized by thermal treatment of precursor sol–gel glasses. Segregation of LaF3 nanocrystals in the matrix was confirmed from a structural analysis by means of X‐ray diffraction. Blue, green and red efficient up‐conversion emissions were observed under 980 nm excitation at room temperature. These results could be attributed to the partition of a fraction of Ho3+ ions into the precipitated LaF3 nanocrystals. Moreover, near infrared down‐conversion at 1.2 μm is also observed. The mechanisms involved in the up‐conversion emissions could be ascribed to a two‐ and three‐ photon process. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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