@ARTICLE{Leśniak_Magdalena_Efficient_2024,
 author={Leśniak, Magdalena and Jiménez, Lesly G. and Starzyk, Bartłomiej and Szymczak, Patryk and Vázquez-López, Carlos and Kochanowicz, Marcin and Kuwik, Marta and Pisarska, Joanna and Pisarski, Wojciech A. and Dorosz, Dominik},
 volume={vol. 31},
 number={No 1},
 journal={Metrology and Measurement Systems},
 pages={37-50},
 howpublished={online},
 year={2024},
 publisher={Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation},
 abstract={Transparent Yb3+/Er3+glass-ceramic was successfully obtained by the extrusion method. The extrusion of oxyfluoride tellurite-germanate glass co-doped with Yb3+and Er3+ions at 520°C resulted in the formation of Ba0:75Er0:25F2:25 nanocrystals, leading to an increase in the upconversion (UC) emission intensity of 35 times in glass-ceramic with respect to the glass. The glass to glass-ceramic transition was confirmed by X-ray diffraction (XRD) and Transmission electron microscope (TEM). Also, the structural changes that occurred during crystallization were assessed using Fourier-transform infrared (FTIR) spectroscopy. Furthermore, the pump power and temperature UC emission dependence of glass and glass-ceramic under 976 nm laser excitation were investigated in detail. The assessments showed that i) two-phonons are involved in the UC process and ii) the temperature has a significant influence over it. The Yb3+/Er3+ codoped glass-ceramic shows relatively high Sa and Sr values in a wide temperature range from 300 to 573 K, presenting the maximal Sa value of 3:50 x 10–3 at 573 K and the maximal Sr value of 6:30 x 10–3at 364 K. These results suggest that the glass-ceramic is a good candidate for optical applications such as luminescent thermometry.},
 type={Article},
 title={Efficient green upconversion emission in transparent Teo2-Geo2 glass-ceramic obtained by billet extrusion},
 URL={http://ochroma.man.poznan.pl/Content/131350/03_5k.pdf},
 doi={10.24425/mms.2024.148540},
 keywords={glass-ceramics, extrusion method, upconversion, temperature sensor, structure-property relationship},
}