Title

Superfluorescent Squaraine with Efficient Two-Photon Absorption and High Photostability

Authors

Authors

K. D. Belfield; M. V. Bondar; H. S. Haniff; I. A. Mikhailov; G. Luchita;O. V. Przhonska

Comments

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Abbreviated Journal Title

ChemPhysChem

Keywords

density functional calculations; donor-acceptor systems; fluorescence; hydrogen bonds; photochemistry; EXCITED-STATE ABSORPTION; NONLINEAR-OPTICAL PROPERTIES; SINGLET OXYGEN; GENERATION; ONE-PHOTON; MOLECULAR DESIGN; CROSS-SECTIONS; QUANTUM; YIELDS; DYES; DERIVATIVES; POLYMETHINE; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

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 (approximate to 0.7) and very high photostability (photodecomposition quantum yields approximate to 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 approximate to 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.

Journal Title

Chemphyschem

Volume

14

Issue/Number

15

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

3532

Last Page

3542

WOS Identifier

WOS:000328674000018

ISSN

1439-4235

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