Photoinduced energy and electron transfer in rubrene-benzoquinone and rubrene-porphyrin systems
AuthorsKhan, Jafar Iqbal
Abbas, Abdullah Saud
Aly, Shawkat Mohammede
Mohammed, Omar F.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
KAUST Solar Center (KSC)
Chemical Science Program
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AbstractExcited-state electron and energy transfer from singlet excited rubrene (Ru) to benzoquinone (BQ) and tetra-(4-aminophenyl) porphyrin (TAPP) were investigated by steady-state absorption and emission, time-resolved transient absorption, and femtosecond (fs)-nanosecond (ns) fluorescence spectroscopy. The low reduction potential of BQ provides the high probability of electron transfer from the excited Ru to BQ. Steady-state and time-resolved results confirm such an excited electron transfer scenario. On the other hand, strong spectral overlap between the emission of Ru and absorption of TAPP suggests that energy transfer is a possible deactivation pathway of the Ru excited state.
SponsorsShawkat M. Aly is grateful for the post-doctoral fellowship provided by Saudi Basic Industries Corporation (SABIC). The work reported herein was supported by the King Abdullah University of Science and Technology.
JournalChemical Physics Letters