Nonlinear transmission and excited-state absorption in fluorene derivatives
Abbreviated Journal Title
The nonlinear transmission and the excited-state absorption spectra of three fluorene derivatives exhibiting large two-photon absorptivity were measured by the third harmonic of a picosecond Nd:YAG laser. We analyzed their capability for exhibiting stimulated emission in polar solvents and found that asymmetrical fluorene compounds with a diphenylamino substituent exhibited large Stokes shifts (similar to8000 cm(-1)), high quantum yields (similar to0.9-1.0), and no optical gain over their entire fluorescence spectral region. In contrast, a symmetrical fluorene derivative with vinylphenylbenzothiazole substituents in positions 2 and 7 underwent lasing tinder one-photon excitation by use of picosecond pulsed irradiation. (C) 2004 Optical Society of America.
"Nonlinear transmission and excited-state absorption in fluorene derivatives" (2004). Faculty Bibliography 2000s. 4201.