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Optical properties of Ho3+-Yb3+co-doped nanostructured SiO2-LaF3glass-ceramics prepared by sol-gel method

✍ Scribed by Velázquez, J. J. ;Yanes, A. C. ;Castillo, J. del ;Méndez-Ramos, J. ;Rodríguez, V. D.

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
318 KB
Volume
204
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

Transparent glass‐ceramics with composition of 95SiO~2~–5LaF~3~ doped with 0.1 mol% of Ho^3+^ or co‐doped with 0.1 mol% of Ho^3+^ and 0.3 mol% of Yb^3+^ were synthesized by thermal treatment of precursor sol–gel glasses. Segregation of LaF~3~ 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 Ho^3+^ ions into the precipitated LaF~3~ 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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