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Superfluorescent squaraine with efficient two-photon absorption and high photostability.
- Source :
-
Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2013 Oct 21; Vol. 14 (15), pp. 3532-42. Date of Electronic Publication: 2013 Sep 10. - Publication Year :
- 2013
-
Abstract
- The synthesis, linear photophysical, two-photon absorption (2PA), femtosecond transient absorption, and superfluorescence properties of a new symmetrical squaraine derivative (1) are reported. Steady-state linear spectral and photochemical properties, fluorescence lifetimes, and excitation anisotropy of 1 were investigated in various organic solvents. High fluorescence quantum yields (≈0.7) and very high photostability (photodecomposition quantum yields ≈10(-6)-10(-8)) were observed. An open-aperture Z-scan method was used to obtain 2PA spectra of 1 over a broad spectral range (maximum 2PA cross section ≈1000 GM). Excited-state absorption (ESA) and gain was observed by femtosecond transient absorption spectroscopy, in which both reached a maximum at approximately 500 fs. Squaraine 1 exhibits efficient superfluorescence. The quantum chemical study of 1 revealed the simulated vibronic nature of the 1PA and 2PA spectra were in good agreement with experimental data; this may provide the ability to predict potential advanced photonic materials.<br /> (Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1439-7641
- Volume :
- 14
- Issue :
- 15
- Database :
- MEDLINE
- Journal :
- Chemphyschem : a European journal of chemical physics and physical chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 24022985
- Full Text :
- https://doi.org/10.1002/cphc.201300447