TY - JOUR
T1 - Photophysics and transient nonlinear optical response of donor-[60]fullerene hybrids
AU - Aloukos, Panagiotis
AU - Iliopoulos, Konstantinos
AU - Couris, Stelios
AU - Guldi, Dirk M.
AU - Sooambar, Chloe
AU - Mateo-Alonso, Aurelio
AU - Nagaswaran, Praveen Ganesh
AU - Bonifazi, Davide
AU - Prato, Maurizio
PY - 2011/2/28
Y1 - 2011/2/28
N2 - The photophysical properties of some recently synthesized donor-[60]fullerene hybrids, porphyrinyl- and ferrocenyl-[60]fullerene dyads, are studied by means of absorption, fluorescence and femtosecond transient absorption spectroscopy. The formation of charge transfer states is experimentally confirmed, while it is shown that an efficient photoinduced intra-molecular electron-transfer process takes place between the donors (i.e. porphyrin, ferrocene) and the acceptor (i.e. [60]fullerene). In addition, the transient nonlinear optical response of these [60]fullerene dyads is investigated under visible nanosecond laser excitation. Both dyads were found to exhibit significantly enhanced second hyperpolarizability (γ) compared to that of unfunctionalized [60]fullerene, while the refractive part of their nonlinearity dominated their nonlinear optical response in contrast to what has been observed for pristine fullerene and other functionalized fullerenes. Moreover, their optical limiting action is investigated both experimentally and by means of a five-level model. The results are discussed and compared with other literature reports.
AB - The photophysical properties of some recently synthesized donor-[60]fullerene hybrids, porphyrinyl- and ferrocenyl-[60]fullerene dyads, are studied by means of absorption, fluorescence and femtosecond transient absorption spectroscopy. The formation of charge transfer states is experimentally confirmed, while it is shown that an efficient photoinduced intra-molecular electron-transfer process takes place between the donors (i.e. porphyrin, ferrocene) and the acceptor (i.e. [60]fullerene). In addition, the transient nonlinear optical response of these [60]fullerene dyads is investigated under visible nanosecond laser excitation. Both dyads were found to exhibit significantly enhanced second hyperpolarizability (γ) compared to that of unfunctionalized [60]fullerene, while the refractive part of their nonlinearity dominated their nonlinear optical response in contrast to what has been observed for pristine fullerene and other functionalized fullerenes. Moreover, their optical limiting action is investigated both experimentally and by means of a five-level model. The results are discussed and compared with other literature reports.
UR - http://www.scopus.com/inward/record.url?scp=79751476067&partnerID=8YFLogxK
U2 - 10.1039/c0jm03520c
DO - 10.1039/c0jm03520c
M3 - Article
AN - SCOPUS:79751476067
SN - 0959-9428
VL - 21
SP - 2524
EP - 2534
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 8
ER -