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Upconversion nanoparticles for sensing pH

Tsai, Evaline S. ; Himmelstoß, Sandy F. ; Wiesholler, Lisa M. ; Hirsch, Thomas ; Hall, Elizabeth A. H.


Upconversion nanoparticles (UCNPs) can provide a vehicle for chemical imaging by coupling chemically sensitive dyes and quenchers. The mechanism for coupling of two anthraquinone dyes, Calcium Red and Alizarin Red S, was investigated as a function of pH. The green emission band of the UCNPs was quenched by a pH-dependent inner filter effect (IFE) while the red emission band remained unchanged and ...


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