Journal
DYES AND PIGMENTS
Volume 104, Issue -, Pages 15-23Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2013.12.023
Keywords
Nonlinear optical chromophores; Donor modification; Poling; Electra-optic coefficients; Steric hindrance; Molecular free mobility
Funding
- Directional Program of the Chinese Academy of Sciences [(KICX2.YW.H02]
- Innovation Fund of the Chinese Academy of Sciences [CXJJ-11-M035]
- National Natural Science Foundation of China [61101054]
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We synthesized three new donor-modified push-pull chromophores with the same divinylenethio-phenyl bridge and tricyanofuran acceptor, but with different modified donor moieties. Structure analysis and photophysical properties were carried out to compare the molecular mobility and steric hindrance effect of different donor-modified chromophores. Density functional theory calculations and thermal properties showed the different results of chromophores' microscopic nonlinearity and thermal stability. In electro-optic activities, the poling process demonstrated that guest-host electro-optic polymers containing the chromophores with different steric hindrance and molecular free mobility, required different optimal poling condition to achieve the large macroscopic electro-optic coefficients. After the exploration of the poling condition, it showed an ultra large electro-optic coefficient (266 pm/V) for electro-optic polymer WJ5-APC-2, which indicated the fine-tuning of steric hindrance and molecular free mobility of chromophore WJ5 in host polymer APC-2. Meanwhile, steric hindrance also improved the temporal stability of electro-optic coefficients for WJ5-APC-2. (C) 2013 Elsevier Ltd. All rights reserved.
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