TY - JOUR
T1 - Electric field effect on the charge migration of methylene-linked carbazole and terephthalic acid methyl ester in PMMA polymer films
AU - Nishimura, Yoshinobu
AU - Ohta, Nobuhiro
AU - Yamamoto, Masahide
AU - Yamazaki, Iwao
N1 - Funding Information:
This work was supported by Grant-in-Aids for Scientific Research #I09740507 from the Ministry of Education, Science and Culture of Japan.
PY - 1997/8/25
Y1 - 1997/8/25
N2 - Photoinduced inter- and intramolecular electron transfer reactions of methylene-linked (n) carbazole and terephthalic acid methyl ester (abbreviated as D-(n)-A, n=4 and 12) have been examined by using external electromodulated fluorescence spectroscopy and photocurrent measurement, which allow one to obtain information about the Stark shift and the efficiency of fluorescence quenching as well as photocarrier generation induced by an electric field. The action spectra of the photocurrent could be successfully measured at various concentrations in the absorption region of carbazole (240-365 nm). The obtained action spectra agree well with the simultaneously measured fluorescence excitation spectra, indicating that photocarrier generation occurs following the relaxations including internal conversion to S1 and excitation energy migration among carbazole chromophores. Furthermore, the efficiency of photocarrier generation of D-(12)-A is higher than that of D-(4)-A, indicating that an intramolecular recombination process plays an important role in charge recombination of a photogenerated ion-pair state.
AB - Photoinduced inter- and intramolecular electron transfer reactions of methylene-linked (n) carbazole and terephthalic acid methyl ester (abbreviated as D-(n)-A, n=4 and 12) have been examined by using external electromodulated fluorescence spectroscopy and photocurrent measurement, which allow one to obtain information about the Stark shift and the efficiency of fluorescence quenching as well as photocarrier generation induced by an electric field. The action spectra of the photocurrent could be successfully measured at various concentrations in the absorption region of carbazole (240-365 nm). The obtained action spectra agree well with the simultaneously measured fluorescence excitation spectra, indicating that photocarrier generation occurs following the relaxations including internal conversion to S1 and excitation energy migration among carbazole chromophores. Furthermore, the efficiency of photocarrier generation of D-(12)-A is higher than that of D-(4)-A, indicating that an intramolecular recombination process plays an important role in charge recombination of a photogenerated ion-pair state.
UR - https://www.scopus.com/pages/publications/0032056978
M3 - Conference article
AN - SCOPUS:0032056978
SN - 1058-725X
VL - 315
SP - 483/181-488/186
JO - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
T2 - Proceedings of the 1997 8th Sympoisum on Unconventional Photoactive Systems (UPS)
Y2 - 25 May 1997 through 29 May 1997
ER -