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    • Excitation energy transfer from dye molecules to doped graphene

      R S Swathi K L Sebastian

      Volume 124 Issue 1 January 2012 pp 233-240

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/124/01/0233-0240

    • Keywords

       

      FRET; graphene; quenching; doping; Dirac cone approximation; Fermi golden rule; K-Point; electron-hole pairs.

    • Abstract

       

      Recently, we have reported theoretical studies 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 $\alpha z^{−4}$. The process was found to be effective up to 30 $nm$ which is well beyond the traditional FRET limit. In this report, we study the transfer of an amount of energy $\hbar \Omega$ from a dye molecule to doped graphene. We find a crossover of the distance dependence of the rate from $z^{−4}$ 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 $\hbar \Omega/2$.

    • Author Affiliations

       

      R S Swathi1 K L Sebastian2

      1. School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram 695 016, India
      2. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India

    • Dates

       
      Published
      January 2012

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