(a) Structure of the oligofluorenes and polyfluorene; OF represents -mer; (b) structure of OF3K, OF5K, and OF7K.
The steady-state UV-Vis and fluorescence spectra of OF3 and OF3K in solution (chloroform) and thin film.
(a) The monoexponential fluorescence decay plots of the oligofluorenes and polyfluorene in MTHF solution at room temperature. The concentration of fluorene units is ; (b) relation between the fluorescence lifetimes and the reciprocal number of the fluorene units [the experimental data were shown with square symbols; for comparison, the data from literature (Ref. 41) were shown by circle symbols].
(Color) The decay of emission of OF5 in solution and film at room temperature and 77 K.
The delayed fluorescence spectra of in solution and film at room temperature and 77 K. The delay time of measurement of DF for is 1.3 ns at 77 K and 1 ns at room temperature.
The dependence of fluorescence and delayed fluorescence intensity of OF5 in MTHF on laser pulse energy probed at 406 nm at room temperature and 77 K. The time delay for measurements of DF was 10 ns; excitation wavelength is 365 nm.
Delayed emission spectra of OF5 in -THF at 77 K at different delay time.
The combined CW fluorescence of OF5K, DF, and phosphorescence spectra of OF5 at 77 K ( OF5 and OF5K in frozen MTHF matrix).
Summary of UV-Vis absorption (abs), fluorescence (flu) spectra, transition dipole moment , and lifetime of fluorenyl oligomers and polymer in chloroform solution.
The compilation of the energy gap, such as , and for OF1, OF3, OF5, and . (OF1: the fluorene monomer).
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