Bansal, A. K. and Penzkofer, Alfons (2008) Linear and nonlinear optical spectroscopic characterisation of triphenylamine and 1,2,3-tris(3-methylphenylphenylamino)benzene. CHEMICAL PHYSICS, 352 (1-3). pp. 48-56. ISSN 0301-0104,
Full text not available from this repository. (Request a copy)Abstract
The molecule triphenylamine (TPA) in tetrahydrofuran (THF) and the starburst triphenylamine oligomer 1,3,5-tris(3-methylphenylphenylamino)benzene (m-MTDAB) in THF and as neat film are characterized. Absorption and emission spectroscopic parameters are determined. The SO-S, transition is found to be weak (n pi(+) transition) with small fluorescence quantum yield and efficient non-radiative decay (singlet-triplet intersystem crossing). The S-0-S-1 absorption cross-section spectra in the tails of the broad first absorption bands of the compounds are separated out by radiative lifetime determination and applying the mirror-image relation between absorption and emission. Excimer formation is observed for m-MTDAB neat films, its photo-dynamics is studied, and monomer and excimer stimulated emission cross-section spectra are extracted. Reverse saturable absorption is observed for TPA and m-MTDAB in picosecond laser nonlinear transmission measurements (laser duration 35 ps, laser wavelength 347.15 nm) and the responsible excited-state absorption cross-sections are determined. A new method is developed to calculate the excited-state absorption cross-section spectra of the samples in the fluorescence spectral region by amplification/attenuation of spontaneous emission measurements. The excited-state absorption is found to be larger than the stimulated emission for TPA in THF and for m-MTDAB films excluding their lasing ability. For m-MTDAB in THF the stimulated emission is found to be slightly larger than the excited-state absorption at the wavelength position of peak fluorescence emission. (C) 2008 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; METHYL-SUBSTITUTED DERIVATIVES; AMORPHOUS MOLECULAR MATERIALS; PHOTO-PHYSICAL CHARACTERIZATION; HOLE-TRANSPORT; THIN-FILMS; NEAT FILMS; AROMATIC-AMINES; LASING CHARACTERIZATION; FLUORESCENCE BEHAVIOR; triphenylamine TPA; tris(3-methylphenylphenylamino)benzene; m-MTDAB; OLED hole-transport materials; neat films; absorption spectroscopy; fluorescence spectroscopy; reverse saturable absorption; attenuation/amplification of spontaneous emission; excited-state absorption |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Oct 2020 07:12 |
| Last Modified: | 26 Oct 2020 07:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30296 |
Actions (login required)
 |
View Item |
