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Investigations on the fluorescence quenching of graphene have been carriedout with two organic donor molecules, pyrene butanaoic acid succinimidyl ester(PyBS, I) and oligo(p-phenylenevinylene) methyl ester (OPV-ester, II).Absorption and photoluminescence spectra of I and II recorded in mixture withincreasing the concentrations of graphene showed no change in the former, butremarkable quenching of fluorescence. The property of graphene to quenchfluorescence of these aromatic molecules is shown to be associated withphoto-induced electron transfer, on the basis of fluorescence decay andtime-resolved transient absorption spectroscopic measurements.

Quenching of fluorescence of aromatic molecules by graphene due to electron transfer