Highly fluorescent push-pull (D--A) systems for luminescent solar concentrators
Hussein Abdullah Zaky Sabek;
Abstract
Solvation-dependent photophysical properties of two push–pull thiophene-based compounds with donor–π–acceptor (D–π–A) structures were investigated using absorption, fluorescence emis-sion and time resolved spectroscopy, and supported by different solvation models. Intramolecular charge transfer characteristics of these structurally similar 2-fluoro-4-(5-(4-methoxyphenyl) thiophen-2-yl) benzonitrile (MOT) and 4-(5-(4-(dimethylamino) phenyl) thiophen-2-yl)-2-fluorobenzonitrile (DMAT) were investigated.
Significant enhancement of intramolecular charge transfer strength has been observed through molecular structure modification of the electron donating group from methoxy to dimethylamine group. Ground state absorption spectra show a small red shift of about 10 nm and 18 nm while the fluorescence emission spectra show a large red shift of about 66 nm and 162 nm on changing from the nonpolar cyclohexane to the aprotic polar DMSO for MOT and DMAT, respectively. Dipole moment change from the ground state to the charge transfer excited state is calculated to be 6.6 D in MOT and 9.0 D in DMAT.
The fluorescence quantum yield, fluorescence lifetime and the derived radiative and non-radiative rate constants were found to be better correlated to the emission energy rather than any of
Significant enhancement of intramolecular charge transfer strength has been observed through molecular structure modification of the electron donating group from methoxy to dimethylamine group. Ground state absorption spectra show a small red shift of about 10 nm and 18 nm while the fluorescence emission spectra show a large red shift of about 66 nm and 162 nm on changing from the nonpolar cyclohexane to the aprotic polar DMSO for MOT and DMAT, respectively. Dipole moment change from the ground state to the charge transfer excited state is calculated to be 6.6 D in MOT and 9.0 D in DMAT.
The fluorescence quantum yield, fluorescence lifetime and the derived radiative and non-radiative rate constants were found to be better correlated to the emission energy rather than any of
Other data
| Title | Highly fluorescent push-pull (D--A) systems for luminescent solar concentrators | Other Titles | أنظمة فلوريسينية قوية من نوع (D--A) لتصنيع مركزات شمسية مضيئة | Authors | Hussein Abdullah Zaky Sabek | Issue Date | 2021 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| BB10778.pdf | 945.49 kB | Adobe PDF | View/Open |
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