TY - JOUR
T1 - Femtosecond fluorescence spectroscopy and near-field spectroscopy of water-soluble tetra(4-sulfonatophenyl)porphyrin and its J-aggregate
AU - Miura, Atsushi
AU - Shibata, Yutaka
AU - Chosrowjan, Haik
AU - Mataga, Noboru
AU - Tamai, Naoto
N1 - Funding Information:
This work was partially supported by Grant-in-Aid for Scientific Research on Priority Areas of Molecular Nano Dynamics, from MEXT, Japan.
PY - 2006/3/20
Y1 - 2006/3/20
N2 - Fluorescence dynamics of tetra(4-sulfonatophenyl)porphyrin (TPPS) in aqueous solution and mesoscopic structures of TPPS in thin films have been investigated by femtosecond fluorescence up-conversion spectroscopy and scanning probe microscopy (AFM/SNOM), respectively. We observed very short lifetime in B-state fluorescence of J-aggregate (140 ± 10 fs) which was shorter than that of monomer (200 ± 10 fs) and protonated monomer (530 ± 10 fs). In addition to the very short lifetime component in B state, we found very weak and short lifetime component in Q state of monomer TPPS. Fluorescence observed at the shorter wavelength edge of the monomer Q band has a comparable short lifetime of 240 ± 20 fs as well as B-state component which has been assigned to the fluorescence from Qy(0, 0) state. TPPS J-aggregate prepared by spin coating on the substrate shows quasi-2D nano-rod structures originated from the interaction between 1D J-aggregate. Large microcrystalline structures were observed in drop cast film. Near-field absorption and fluorescence images suggest the structural inhomogeneities of J-aggregate microcrystals.
AB - Fluorescence dynamics of tetra(4-sulfonatophenyl)porphyrin (TPPS) in aqueous solution and mesoscopic structures of TPPS in thin films have been investigated by femtosecond fluorescence up-conversion spectroscopy and scanning probe microscopy (AFM/SNOM), respectively. We observed very short lifetime in B-state fluorescence of J-aggregate (140 ± 10 fs) which was shorter than that of monomer (200 ± 10 fs) and protonated monomer (530 ± 10 fs). In addition to the very short lifetime component in B state, we found very weak and short lifetime component in Q state of monomer TPPS. Fluorescence observed at the shorter wavelength edge of the monomer Q band has a comparable short lifetime of 240 ± 20 fs as well as B-state component which has been assigned to the fluorescence from Qy(0, 0) state. TPPS J-aggregate prepared by spin coating on the substrate shows quasi-2D nano-rod structures originated from the interaction between 1D J-aggregate. Large microcrystalline structures were observed in drop cast film. Near-field absorption and fluorescence images suggest the structural inhomogeneities of J-aggregate microcrystals.
KW - Fluorescence up-conversion spectroscopy
KW - J-aggragate
KW - Scanning near-field optical microscopy
KW - Tetra(4-sulfonatophenyl)porphyrin
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U2 - 10.1016/j.jphotochem.2005.10.037
DO - 10.1016/j.jphotochem.2005.10.037
M3 - Article
AN - SCOPUS:33144468723
SN - 1010-6030
VL - 178
SP - 192
EP - 200
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 2-3 SPEC. ISS.
ER -