Journal
ANALYST
Volume 144, Issue 18, Pages 5547-5557Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9an00236g
Keywords
-
Categories
Funding
- EPSRC Cambridge NanoDTC [EP/L015978/1]
Ask authors/readers for more resources
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 acted as the reference signal for ratiometric pH measurements. Contrary to previous expectation, there was little evidence for a resonance energy transfer (RET) mechanism even when the anthraquinones were attached onto the UCNPs through electrostatic attraction. Since the UCNPs are point emitters, only emitters close to the surface of the UCNP are within the expected Forster distance and UC-RET is via IFE.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available