TY - JOUR
T1 - Fluorescence spectrum of a blue-phase polydiacetylene obtained by probe saturation spectroscopy
AU - Yasuda, A.
AU - Yoshizawa, M.
AU - Kobayashi, T.
N1 - Funding Information:
The authors thank Mr. S. Takeuchi and Dr. K. Misawa for valuable discussions, Professor T. Koda, Dr. K. Ishikawa, and Dr. K. Kanetake for advice on preparing oriented PDA-C,UC, film, Messrs. A. Ueki and S. Otsuka for technical assistance in the sample preparation. This research was partly supported by a Grant-in-Aid for Encouragement of Young Scientists (04740159) from the Ministry of Education, Science, and Culture of Japan to MY and a Grant-in-Aid for General Scientific Research (02452299) from the Ministry of Education to TK.
PY - 1993/7/2
Y1 - 1993/7/2
N2 - The dependence of the transient difference transmission spectrum on probe-light intensity was investigated for a blue-phase polydiacetylene with side groups of substituted urethanes. The spectra of stimulated emission and photoinduced absorption of the lowest 1Bu exciton were separately determined in the polymer, which exhibits extremely weak fluorescence with quantum efficiency < 10-5 and ultrashort lifetime of 140 fs, by "probe saturation spectroscopy" newly proposed here. The fluorescence spectrum calculated from the stimulated emission spectrum has a peak near 1.9 eV and is an approximate mirror image to the stationary absorption spectrum. The relaxation time constant from the higher excited state m 1Ag exciton to the lowest 1Bu exciton is estimated to be shorter than 50 fs.
AB - The dependence of the transient difference transmission spectrum on probe-light intensity was investigated for a blue-phase polydiacetylene with side groups of substituted urethanes. The spectra of stimulated emission and photoinduced absorption of the lowest 1Bu exciton were separately determined in the polymer, which exhibits extremely weak fluorescence with quantum efficiency < 10-5 and ultrashort lifetime of 140 fs, by "probe saturation spectroscopy" newly proposed here. The fluorescence spectrum calculated from the stimulated emission spectrum has a peak near 1.9 eV and is an approximate mirror image to the stationary absorption spectrum. The relaxation time constant from the higher excited state m 1Ag exciton to the lowest 1Bu exciton is estimated to be shorter than 50 fs.
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U2 - 10.1016/0009-2614(93)80108-2
DO - 10.1016/0009-2614(93)80108-2
M3 - Article
AN - SCOPUS:0001350388
SN - 0009-2614
VL - 209
SP - 281
EP - 286
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 3
ER -