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The effect of surface ligand, solvent and Yb3+ co-doping on the luminescence properties of Er3+ in colloidal NaGdF4 nanocrystals.
Autorzy
Rok wydania
2014
Czasopismo
Journal of Materials Chemistry C
Numer woluminu
2
Strony
8244-8251
DOI
10.1039/c4tc00228h
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The emission properties of NaGdF4 nanoparticles (NPs) doped with Er3+ and/or Yb3+ ions and their colloidal dispersions in different solvents were investigated. The organic ligands present on the surface of the NPs decrease the decay time of Er3+ emission. In contrast, virtually no change in decay times was observed after dispersing the NPs in solvents. Both surface ligands and solvent molecules exert a pronounced effect on the intensity ratio of the 2H11/2 + 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions. Co-doping with Yb3+ is revealed as another important factor influencing the relative intensities of Er3+ emission bands. The influence of surface ligands and solvent molecules on emission spectra upon NIR excitation at 980 nm was investigated. The decay times of Er3+ emission were longer for Yb3+ co-doped NPs than for analogous NPs single doped with Er3+. This is ascribed to a feedback energy transfer process between Yb3+ and Er3+.
Adres publiczny
http://dx.doi.org/10.1039/c4tc00228h
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