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Star-shaped ladder-type ter(p-phenylene)s for efficient multiphoton absorption.

Lei Guo¹, King Fai Li, Man Shing Wong

¹Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China.

Chemical Communications (Cambridge, England)

|March 26, 2013

Summary

Star-shaped ter(p-phenylene)s demonstrate exceptional two-photon absorption (2PA) and three-photon absorption (3PA) capabilities. These blue-emissive molecules achieve high multiphoton absorption despite their compact π-conjugated structure.

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Area of Science:

Materials Science
Organic Chemistry
Photophysics

Background:

Multiphoton absorption (MPA) is crucial for advanced optical applications.
Designing molecules with efficient MPA requires careful consideration of electronic structure and conjugation length.
Star-shaped molecular architectures offer unique possibilities for enhancing optical properties.

Purpose of the Study:

To investigate the multiphoton absorption properties of star-shaped ladder-type ter(p-phenylene)s.
To correlate molecular structure with observed nonlinear optical behavior.
To explore the potential of these molecules as blue-emissive materials with efficient MPA.

Main Methods:

Femtosecond transient absorption spectroscopy was employed to measure MPA cross-sections.
Synthesis of star-shaped ladder-type ter(p-phenylene) derivatives.
Spectroscopic characterization including absorption and emission spectra.

Main Results:

Achieved a two-photon absorption (2PA) cross-section of up to 2579 GM at 700 nm.
Measured a three-photon absorption (3PA) cross-section of up to 3.35 × 10(-76) cm(6) s(2) in the femtosecond regime.
Demonstrated efficient blue emission from the synthesized molecules.

Conclusions:

Star-shaped ter(p-phenylene)s possess remarkable MPA properties, including high 2PA and 3PA cross-sections.
Efficient MPA is achievable even with a short π-conjugated framework in these star-shaped molecules.
These findings highlight the potential of star-shaped architectures for developing novel materials for nonlinear optics and photonics.