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Observation of Room-Temperature Photoluminescence Blinking in Armchair-Edge Graphene Nanoribbons
journal contribution
posted on 2018-10-18, 00:00 authored by Markus Pfeiffer, Boris V. Senkovskiy, Danny Haberer, Felix R. Fischer, Fan Yang, Klaus Meerholz, Yoichi Ando, Alexander Grüneis, Klas LindforsBy
enhancing the photoluminescence from aligned seven-atom wide
armchair-edge graphene nanoribbons using plasmonic nanoantennas, we
are able to observe blinking of the emission. The on- and off-times
of the blinking follow power law statistics. In time-resolved spectra,
we observe spectral diffusion. These findings together are a strong
indication of the emission originating from a single quantum emitter.
The room temperature photoluminescence displays a narrow spectral
width of less than 50 meV, which is significantly smaller than the
previously observed ensemble line width of 0.8 eV. From spectral time
traces, we identify three optical transitions, which are energetically
situated below the lowest bulk excitonic state E11 of the
nanoribbons. We attribute the emission to transitions involving Tamm
states localized at the end of the nanoribbon. The photoluminescence
from a single ribbon is strongly enhanced when its end is in the antenna
hot spot resulting in the observed single molecule characteristics
of the emission. Our findings illustrate the essential role of the
end termination of graphene nanoribbons in light emission and allow
us to construct a model for photoluminescence from nanoribbons.
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Room-Temperature Photoluminescence Blinkingtime tracesArmchair-Edge Graphene Nanoribbonsensemble line widthbulk excitonic state E 11power law statisticsplasmonic nanoantennasgraphene nanoribbonsroom temperature photoluminescence displaysend terminationlight emissionfinding50 meVmolecule characteristics0.8 eVarmchair-edge graphene nanoribbonsTamm statestransitiontime-resolved spectraquantum emitter
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