Superfluorescent Squaraine with Efficient Two-Photon Absorption and High Photostability

Authors

  • Prof. Kevin D. Belfield,

    Corresponding author
    1. Department of Chemistry, University of Central Florida, P.O. Box 162366, Orlando, FL 32816-2366 (USA)
    2. CREOL, The College of Optics and Photonics, University of Central Florida, P.O. Box 162366, Orlando, FL 32816-2366 (USA)
    • Department of Chemistry, University of Central Florida, P.O. Box 162366, Orlando, FL 32816-2366 (USA)

    Search for more papers by this author
  • Dr. Mykhailo V. Bondar,

    1. Institute of Physics National Academy of Sciences of Ukraine, Prospect Nauki, 46, Kiev-28, 03028 (Ukraine)
    Search for more papers by this author
  • Hafeez S. Haniff,

    1. Department of Chemistry, University of Central Florida, P.O. Box 162366, Orlando, FL 32816-2366 (USA)
    Search for more papers by this author
  • Dr. Ivan A. Mikhailov,

    1. Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, St. Petersburg (Russia)
    Search for more papers by this author
  • Dr. Gheorghe Luchita,

    1. Department of Chemistry, University of Central Florida, P.O. Box 162366, Orlando, FL 32816-2366 (USA)
    Search for more papers by this author
  • Dr. Olga V. Przhonska

    1. Institute of Physics National Academy of Sciences of Ukraine, Prospect Nauki, 46, Kiev-28, 03028 (Ukraine)
    Search for more papers by this author

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.

Ancillary