Abstract
Uniform hexagonal NaYF 4: Yb 3+, Er 3+ nanocrystals (NCs) with bright green upconversion fluorescence were prepared. The nanocrystals were highly hydrophobic and dispersed in cyclohexane forming a transparent colloidal solution due to the use of oleic acid as a capping ligand. Temperature dependence for emission of Er 3+ ions in this sample was also studied. The green emission intensity of Er 3+ ions had a maximum at 160 K under 980 nm excitation, which was attributed to the thermally activated distribution of electrons and the thermal quenching effect. The transparent colloidal solution is expected to be a good candidate for research in biological imaging or display applications.
Original language | English |
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Pages (from-to) | 1825-1828 |
Number of pages | 4 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 10 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2010 |
Externally published | Yes |
Keywords
- NaYF
- Nonradiative relaxation
- Rare earth