A1 Refereed original research article in a scientific journal
Upconversion from fluorophosphate glasses prepared with NaYF4:Er3+,Yb3+ nanocrystals
Authors: N. Ojha, M. Tuomisto, M. Lastusaari, L. Petit
Publisher: ROYAL SOC CHEMISTRY
Publication year: 2018
Journal: RSC Advances
Journal name in source: RSC ADVANCES
Journal acronym: RSC ADV
Volume: 8
Issue: 34
First page : 19226
Last page: 19236
Number of pages: 11
ISSN: 2046-2069
DOI: https://doi.org/10.1039/c8ra03298j
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/32063087
Abstract
The direct doping method was applied to fabricate upconverter fluorophosphate glasses in the system (90NaPO(3)-(10-x)Na2O-xNaF) (mol%) by adding NaYF4:Er3+,Yb3+ nanocrystals. An increase in the network connectivity, a red shift of the optical band gap and a decrease in the thermal properties occur when Na2O is progressively replaced by NaF. To ensure the survival and the dispersion of the nanocrystals in the glasses with x = 0 and 10, three doping temperatures (T-doping) (525, 550 and 575 degrees C) at which the nanocrystals were added in the glass melt after melting and 2 dwell times (3 and 5 minutes) before quenching the glasses were tested. Using 5 wt% of the NaYF4:Er3+,Yb3+ nanocrystals, green emission from the NaYF4:Er3+,Yb3+ nanocrystals-containing glasses was observed using a 980 nm pumping, the intensity of which depends on the glass composition and on the direct doping parameters (T-doping and dwell time). The strongest upconversion was obtained from the glass with x = 10 prepared using a T-doping of 550 degrees C and a 3 min dwell time. Finally, we showed that the upconversion, the emission at 1.5 m and of the transmittance spectra of the nanocrystals-containing glasses could be measured to verify if decomposition of the nanocrystals occurred in glass melts during the preparation of the glasses.
The direct doping method was applied to fabricate upconverter fluorophosphate glasses in the system (90NaPO(3)-(10-x)Na2O-xNaF) (mol%) by adding NaYF4:Er3+,Yb3+ nanocrystals. An increase in the network connectivity, a red shift of the optical band gap and a decrease in the thermal properties occur when Na2O is progressively replaced by NaF. To ensure the survival and the dispersion of the nanocrystals in the glasses with x = 0 and 10, three doping temperatures (T-doping) (525, 550 and 575 degrees C) at which the nanocrystals were added in the glass melt after melting and 2 dwell times (3 and 5 minutes) before quenching the glasses were tested. Using 5 wt% of the NaYF4:Er3+,Yb3+ nanocrystals, green emission from the NaYF4:Er3+,Yb3+ nanocrystals-containing glasses was observed using a 980 nm pumping, the intensity of which depends on the glass composition and on the direct doping parameters (T-doping and dwell time). The strongest upconversion was obtained from the glass with x = 10 prepared using a T-doping of 550 degrees C and a 3 min dwell time. Finally, we showed that the upconversion, the emission at 1.5 m and of the transmittance spectra of the nanocrystals-containing glasses could be measured to verify if decomposition of the nanocrystals occurred in glass melts during the preparation of the glasses.
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