@ARTICLE{Kochanowicz_M._Up-conversion_2016,
 author={Kochanowicz, M. and Zmojda, J. and Ragin, T. and Miluski, P. and Jelen, P.},
 volume={vol. 24},
 number={No 3},
 journal={Opto-Electronics Review},
 pages={155-161},
 howpublished={online},
 year={2016},
 publisher={Polish Academy of Sciences (under the auspices of the Committee on Electronics and Telecommunication) and Association of Polish Electrical Engineers in cooperation with Military University of Technology},
 abstract={In the paper the analysis of up-conversion (UC) luminescence in 0.5Yb2O3/(0.25-1)Eu2O3 (mol.%) co-doped germanate glass and optical fibre has been investigated. Up-conversion emission of bands at 591, 616, 652, 701 nm to which correspond Eu3+: 5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3, 5D0 → 7F4 transitions, respectively was obtained as a result of cooperative energy transfer between Yb3+ and Eu3+ ions. The highest up-conversion emission (Yb3+ → Eu3+ energy transfer efficiency η = 24%) was obtained in 0.5Yb2O3/0.75Eu2O3 co-doped glass. Comparison of up-conversion and down-conversion luminescence spectra of bulk glass, glass fibre and different length double-clad optical fibre (up to 5 m) showed subtle differences in shape of the spectrum. In comparison to down – conversion emission (λexc = 405 nm) main UC luminescence band is red-shifted by 2 nm and is characterized by 5 nm greater full – width half – maximum (FWHM).},
 type={Article},
 title={Up-conversion luminescence in germanate glass and double-clad optical fibre co-doped with Yb3+/Eu3+ ions},
 URL={http://journals.pan.pl/Content/116102/PDF-MASTER/pan_doi_blank.pdf},
 keywords={germanate glass, co-doped with Yb3+/Eu3+, optical fibre, up-conversion luminescence},
}