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We have studied phosphor doping of core / shell nanocrystals (NCs) where the impurity emitter resides in the shell.
We have found that a two step synthesis can be used to create these non-toxic materials that efficiently transfer energy
from the core to the doped shell. These core / shell NCs retain ample brightness when solubilized in water. We
explored the functionalization of these materials in water as well to create ratiometric chemical sensing agents. First,
we used a method of controlled polymerization to synthesize amphiphilic polymers to solubilize the intrinsically
hydrophobic NCs into water. The polymer has a build in "chemical handle" which we use to functionalize the polymers
closely bound to the NC with a fluorescent dye in aqueous solution. We have found that there exists efficient Förster
resonant energy transfer from the shell doped phosphors to the surface bound dyes. Conjugation of the NC to an
environmentally sensitive dye such as fluorescein has also demonstrated that non-toxic doped NCs can be used to
develop ratiometric sensing / biological imaging agents. Last, we have found that the same technique can be applied to
functionalize non-emissive magnetic nanocrystals as well.
Yingchuan Chen,Leah Page,Rahul Thakar, andPreston T. Snee
"Synthesis and functionalization of non-toxic visible-emitting nanocrystals", Proc. SPIE 6866, Colloidal Quantum Dots for Biomedical Applications III, 686603 (22 February 2008); https://doi.org/10.1117/12.784058
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Yingchuan Chen, Leah Page, Rahul Thakar, Preston T. Snee, "Synthesis and functionalization of non-toxic visible-emitting nanocrystals," Proc. SPIE 6866, Colloidal Quantum Dots for Biomedical Applications III, 686603 (22 February 2008); https://doi.org/10.1117/12.784058