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Issue 7, 2012
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A melt-processable squaraine-based organic glass for nonlinear optics

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Abstract

The synthesis and properties of a new indole-based squaraine dye functionalized with ethylhexyl substituents are reported. The chromophore displays a large two-photon absorption cross-section of ∼1490 GM at a resonance wavelength of 1160 nm. The crystalline material exhibits a melting temperature of 222 °C, which is sufficiently low to allow for melt-processing without significant thermal decomposition. Crystallization of the dye from the melt is exceedingly slow, so that amorphous glasses with a glass transition temperature of 60 °C can easily be produced, even without particularly rapid cooling. This allows the fabrication of thin films and more complex shapes, which offer a maximum of dye content, yet lack the scattering effects associated with organic crystalline materials.

Graphical abstract: A melt-processable squaraine-based organic glass for nonlinear optics

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Publication details

The article was received on 31 Oct 2011, accepted on 22 Dec 2011 and first published on 11 Jan 2012


Article type: Communication
DOI: 10.1039/C2JM15573G
J. Mater. Chem., 2012,22, 2848-2850

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    A melt-processable squaraine-based organic glass for nonlinear optics

    B. T. Makowski, B. Valle, K. D. Singer and C. Weder, J. Mater. Chem., 2012, 22, 2848
    DOI: 10.1039/C2JM15573G

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