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Superfluorescent Squaraine with Efficient Two‐Photon Absorption and High Photostability
Author(s) -
Belfield Kevin D.,
Bondar Mykhailo V.,
Haniff Hafeez S.,
Mikhailov Ivan A.,
Luchita Gheorghe,
Przhonska Olga V.
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300447
Subject(s) - ultrafast laser spectroscopy , femtosecond , absorption (acoustics) , two photon absorption , excited state , chemistry , photochemistry , fluorescence , absorption spectroscopy , spectroscopy , quantum efficiency , absorption cross section , materials science , optoelectronics , optics , atomic physics , laser , cross section (physics) , physics , quantum mechanics , composite material
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.