New highly efficient two-photon fluorescent dyes

Kevin D. Belfield; Alma R. Morales; Sheng Yao; Allyn Brice; Joel M. Hales; David J. Hagan; Eric W. Van Stryland

doi:10.1117/12.529633

18 June 2004 New highly efficient two-photon fluorescent dyes

Kevin D. Belfield, Alma R. Morales, Sheng Yao, Allyn Brice, Joel M. Hales, David J. Hagan, Eric W. Van Stryland

Proceedings Volume 5351, Organic Photonic Materials and Devices VI; (2004) https://doi.org/10.1117/12.529633
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

Organic compounds that undergo strong nonlinear, multiphoton absorption have been gaining greater interest, mainly in the developing fields of multiphoton fluorescence imaging, optical data storage, 3-D microfabrication, and photodynamic therapy. Systematic studies have shown that conjugated organic molecules with large delocalized π electron systems show very large nonlinear optical effects. Two-photon absorbing chromophores have also been incorporated into dendrimers to increase two-photon absorptivity. A cooperative enhancement of two-photon absorption (2PA) has been observed, such as in the linkage of branched chromophores through a common amine group and chromophore-metal complexes. This enhancement may be related to extensive two-dimensional π-delocalization in these molecules. Herein, we describe the synthesis, structural characterization and photophysical study of a series of compounds (model, oligomer, and polymer) with symmetric molecular structure of the D-π-D motif and branched D-π-D dendrimeric structures based on substituted fluorene derivatives. Femtosecond 2PA cross sections were very large for some derivatives (over 10,000 GM) and often exhibited substantial solvent effects.

Citation Download Citation

Kevin D. Belfield, Alma R. Morales, Sheng Yao, Allyn Brice, Joel M. Hales, David J. Hagan, and Eric W. Van Stryland "New highly efficient two-photon fluorescent dyes", Proc. SPIE 5351, Organic Photonic Materials and Devices VI, (18 June 2004); https://doi.org/10.1117/12.529633

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