Speaker
Mr
Tero Laihinen
(University of Turku, Department of Chemistry, Turku, Finland)
Description
In up-conversion luminescence, the absorption of two or more low energy photons is followed by the emission of a high energy photon. NaYF4:Yb3+,R3+ (R: Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er or Tm) materials were prepared to study up-conversion luminescence. The materials were studied with TG-DSC, FTIR and XPD methods. Up-conversion luminescence was studied with NIR laser excitation at 976 nm. The DSC curves showed an exothermic signal at 400-500 oC due to the cubic-to-hexagonal phase transition of NaRF4. The TG curves showed only small mass losses (ca. 2-4 %) during heating to 500 °C. The FTIR spectra did not reveal other impurities apart from water absorbed in the KBr discs. The XPD patterns confirmed the hexagonal structure of the annealed materials. The up-conversion luminescence was observed of Pr3+, Nd3+, Eu3+, Tb3+, Ho3+, Er3+ and Tm3+. The up-conversion luminescence was not obtained of Sm3+ and Dy3+.
Please provide the name and email address of your supervisor.
Mika Lastusaari, miklas@utu.fi
Are you currently a postgraduate student? (Yes/No)
yes
At what level of studies are you currently? (Hons/MSc/PhD)
MSc
Primary author
Mr
Tero Laihinen
(University of Turku, Department of Chemistry, Turku, Finland)
Co-authors
Prof.
Jorma Hölsä
(University of Turku, Department of Chemistry, Turku, Finland)
Dr
Laura Pihlgren
(University of Turku, Department of Chemistry, Turku, Finland)
Prof.
Lucas Rodrigues
(Universidade de São Paulo, Instituto de Química, São Paulo-SP, Brazil)
Dr
Mika Lastusaari
(University of Turku, Department of Chemistry, Turku, Finland)
