Abstract
Quenching effects, including graphite-shell quenching and impurity quenching, on negatively charged nitrogen-vacancy centers in fluorescent nanodiamonds (FNDs) can reduce the fluorescence quantum yield and bring about multiexponential decay fluorescence to FNDs. This causes the number of centers to be underestimated when using the photon correlation method, which presumes identical emitters. This study proposes a method that combines time-resolved spectroscopy and photon correlation spectroscopy to modify the number measurement with the photon correlation method. The average number of centers in 35 nm FNDs was corrected from 7.6 with the unmodified method to 11.96 with the modified method.
© 2012 Optical Society of America
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