NDLI: Structural control of side-chain chromophores to achieve highly efficient electro-optic activity

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Physical Chemistry Chemical Physics Vol - 19 Issue - 9

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Structural control of side-chain chromophores to achieve highly efficient electro-optic activity

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Xinhou Jiang, Guohua Chen, Zhuo Zhen, Zhen Liu, Jialei Yang, Yuhui Xiao, Hongyan
Copyright Year	2017
Abstract	A series of chromophores J1–J4 have been synthesized based on julolidine donors modified with different rigid steric hindrance groups. Compared with the chromophore (J1) without the isolation group, chromophores J2, J3 and J4 show better stability. Structural analysis and photophysical property measurements were carried out to compare the molecular mobility and steric hindrance effect of the different donor-modified chromophores. All of these chromophores with isolation groups showed superb thermal stabilities with high thermal decomposition temperatures above 250 °C. Furthermore, with rigid steric hindrance, chromophores J3 and J4 showed more enhanced thermal stabilities with thermal decomposition temperatures of 269 °C and 275 °C, respectively. Density functional theory was used to calculate the hyperpolarizability (β), and the high molecular hyperpolarizability of these chromophores can be effectively translated into large electro-optic coefficients. The electro-optic coefficients of poled films containing 20 wt% of these new chromophores doped in amorphous polycarbonate were 127, 266 and 209 pm V−1 at 1310 nm for chromophores J1–J3, respectively, while the film containing chromophore J4 showed the largest r33 value of only 97 pm V−1 at 25 wt%. These results indicated that the introduced isolation group can reduce intermolecular electrostatic interactions, thus enhancing the macroscopic electro-optic activity, while the size of the isolation group should be suitable.
Starting Page	11502
Ending Page	11509
Page Count	8
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	18
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c7cp01582h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Square pyramid Density functional theory Steric effects Hyperpolarizability Polycarbonate Chromophore
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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