Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 7, Pages 2848-2850Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm15573g
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Funding
- US National Science Foundation (NSF) [DMR-0602767, DMR-0423914]
- Adolphe Merkle Foundation
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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 similar to 1490 GM at a resonance wavelength of 1160 nm. The crystalline material exhibits a melting temperature of 222 degrees 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 degrees 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.
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