Nonlinear transmission and excited-state absorption in fluorene derivatives

Kevin D. Belfield, Mykhailo V. Bondar, Florencio E. Hernandez, Alma R. Morales, Olga V. Przhonska, Katherine J. Schafer

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The nonlinear transmission and the excited-state absorption spectra of three fluorene derivatives exhibiting large two-photon absorptivity were measured by the third harmonic of a picosecond Nd:YAG laser. We analyzed their capability for exhibiting stimulated emission in polar solvents and found that asymmetrical fluorene compounds with a diphenylamino substituent exhibited large Stokes shifts (∼8000 cm-1), high quantum yields (∼0.9-1.0), and no optical gain over their entire fluorescence spectral region. In contrast, a symmetrical fluorene derivative with vinylphenylbenzothiazole substituents in positions 2 and 7 underwent lasing under one-photon excitation by use of picosecond pulsed irradiation.

Original languageEnglish (US)
Pages (from-to)6339-6343
Number of pages5
JournalApplied Optics
Volume43
Issue number34
DOIs
StatePublished - Dec 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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