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Nonlinear optical responses and ultrafast dynamics of three soluble ladder-conjugated molecules: A study on the terminal group effect.
- Source :
-
Journal of Luminescence . Jan2021, Vol. 229, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- To study the structure-property relationship as well as the intramolecular charge transfer properties of typical ladder-conjugated molecules, three ladder-conjugated molecules named LT2 , LT3 and BPTF-2 were systematically investigated by UV–vis absorption spectra and fluorescence spectra, the open-aperture Z-scan technique, two-photon excited fluorescence and femtosecond pump-probe experiments. These ladder-conjugated molecules employ the same fluorene group as the π -bridge and the central core, with substituent changes at the terminal position. These molecules exhibit a large two-photon absorption response and two molecules emit intense two-photon fluorescence at a wavelength of 800 nm, which is a commonly used wavelength in two-photon absorption/two-photon fluorescence applications. Our results indicate that the π -bridge and the terminal group play an important role in determining the two-photon absorption response. The dynamic results obtained from degenerated pump-probe experiments revealed that the evolution times of the intramolecular charge transfer state were >1000 ps, >1000 ps, and 40 ps for LT2 , LT3 and BDTF-2 , respectively. The results match those of the two-photon absorption responses and the fluorescence emission properties of these ladder-conjugated molecules. Our results also indicate that ladder-conjugated molecules have potential applications in two-photon absorption/two-photon fluorescence fields. • Terminal groups play important role in determining the nonlinear optical response. • The ultrafast dynamics and DFT calculations approved the terminal groups effect. • Ladder-conjugated molecules have potential applications in TPA/TPF fields. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 229
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 146977262
- Full Text :
- https://doi.org/10.1016/j.jlumin.2020.117678