Hexagonal phase nanoparticles of NaYF4:Yb,Er and NaYF4:Yb,Tm (∼8.5 ± 0.8 nm) were synthesized. Significant enhancements of upconversion fluorescence were observed after coating with an undoped NaYF4 shell (core/shell ∼ 11.1 ± 1.5 nm). The hydrophobic core/shell nanoparticles were rendered hydrophilic by a subsequent amphiphilic coating of PAA. These nanostructures have great potentials as bio-probes.
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Yi et al. (2006) studied this question.
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