TY - JOUR
T1 - Femtosecond relaxation kinetics of fluorescent and nonfluorescent states in blue- and red-phase polydiacetylenes
AU - Yoshizawa, M.
AU - Kubo, A.
AU - Saikan, S.
PY - 1999
Y1 - 1999
N2 - Relaxation kinetics of photoexcitations in polydiacetylenes (PDA’s) has been investigated using femtosecond fluorescence spectroscopy. Transient response of the fluorescence in red-phase PDA has decay time constants of 160±40 fs, 0.8±0.1 ps, and 6.7±0.4 ps. The decay kinetics is consistent with transient absorbance changes observed by femtosecond photoinduced absorption spectroscopy. On the other hand, the fluorescence in blue-phase PDA disappears much faster than the transient absorbance change. The photoexcitations in red-phase PDA are fluorescent during the whole relaxation kinetics, but the photoexcited exciton in blue-phase PDA relaxes to nonfluorescent state within 170 fs.
AB - Relaxation kinetics of photoexcitations in polydiacetylenes (PDA’s) has been investigated using femtosecond fluorescence spectroscopy. Transient response of the fluorescence in red-phase PDA has decay time constants of 160±40 fs, 0.8±0.1 ps, and 6.7±0.4 ps. The decay kinetics is consistent with transient absorbance changes observed by femtosecond photoinduced absorption spectroscopy. On the other hand, the fluorescence in blue-phase PDA disappears much faster than the transient absorbance change. The photoexcitations in red-phase PDA are fluorescent during the whole relaxation kinetics, but the photoexcited exciton in blue-phase PDA relaxes to nonfluorescent state within 170 fs.
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U2 - 10.1103/PhysRevB.60.15632
DO - 10.1103/PhysRevB.60.15632
M3 - Article
AN - SCOPUS:0000231035
SN - 0163-1829
VL - 60
SP - 15632
EP - 15635
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 23
ER -