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Optical properties of Ho 3+ –Yb 3+ co‐doped nanostructured SiO 2 –LaF 3 glass‐ceramics prepared by sol–gel method
Author(s) -
Velázquez J. J.,
Yanes A. C.,
Castillo J. del,
MéndezRamos J.,
Rodríguez V. D.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200675349
Subject(s) - doping , materials science , sol gel , nanocrystal , analytical chemistry (journal) , ion , ceramic , nuclear chemistry , mineralogy , nanotechnology , chemistry , optoelectronics , composite material , organic chemistry
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)