Nonlinear transmission and excited-state absorption in fluorene derivatives.
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 (approximately 8000 cm(-1)), high quantum yields (approximately 0.9-1.0), 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 under one-photon excitation by use of picosecond pulsed irradiation.
Belfield
Kevin D
KD
Department of Chemistry and College of Optics and Photonics, University of Central Florida, P.O. Box 162366, Orlando, Florida 32816-2366, USA. kbelfiel@mail.ucf.edu
Bondar
Mykhailo V
MV
Hernandez
Florencio E
FE
Morales
Alma R
AR
Przhonska
Olga V
OV
Schafer
Katherine J
KJ