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research
Excitation energy transfer from dye molecules to doped graphene
Authors
K L Sebastian
R S Swathi
Publication date
15 April 2011
Publisher
View
on
arXiv
Abstract
Recently, we have reported theoretical studies (J. Chem. Phys. 129, 054703, 2008 and J. Chem. Phys. 130, 086101, 2009) on the rate of energy transfer from an electronically excited molecule to graphene. It was found that graphene is a very efficient quencher of the electronically excited states and that the rate
β
\propto
β
(
d
i
s
t
a
n
c
e
)
β
4
(distance)^{-4}
(
d
i
s
t
an
ce
)
β
4
. The process was found to be effective up to
30
β β
n
m
30\;nm
30
nm
which is well beyond the traditional FRET limit. In this report, we study the transfer of an amount of energy
β
Ξ©
\hbar \Omega
βΞ©
from a dye molecule to doped graphene. We find a crossover of the distance dependence of the rate from
(
d
i
s
t
a
n
c
e
)
β
4
(distance)^{-4}
(
d
i
s
t
an
ce
)
β
4
to exponential as the Fermi level is increasingly shifted into the conduction band, with the crossover occurring at a shift of the Fermi level by an amount
β
Ξ©
/
2
\hbar \Omega/2
βΞ©/2
.Comment: This paper was submitted to J. Chem. Phys. on 20/05/201
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