Reinforced Site Isolation Leading to Remarkable Thermal Stability and High Electrooptic Activities in Cross-Linked Nonlinear Optical Dendrimers
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- 作者：Zhengwei Shi ; Jingdong Luo ; Su Huang ; Xing-Hua Zhou ; Tae-Dong Kim ; Yen-Ju Cheng ; Brent M. Polishak ; Todd R. Younkin ; Bruce A. Block ; Alex K.-Y. Jen
- 刊名：Chemistry of Materials
- 出版年：2008
- 出版时间：October 28, 2008
- 年：2008
- 卷：20
- 期：20
- 页码：6372-6377
- 全文大小：181K
- 年卷期：v.20,no.20(October 28, 2008)
- ISSN：1520-5002
文摘
A series of cross-linkable electro-optic (E-O) dendrimers have been developed with anthracene- and acrylate-containing dendrons functionalized on the periphery of chromophores that can form thermally stable Diels−Alder adducts. These new E-O dendrimers with a high density of standardized AJL8-type chromophore are originally prone to thermo-decomposition in their thermoplastic form but can be converted into thermally stable networks to provide excellent site isolation for these chromophores. After poling, large E-O coefficients (up to 84 pm/V at 1310 nm) can be obtained in these dendrimers. These poled E-O dendrimers can maintain their alignment stability at 200 °C for 30 min and also possess impressive long-term stability at 150 °C for more than 200 h. This result provides a very effective molecular engineering approach to systematically increase the thermal stability of highly polarizable dipolar chromophores for high temperature on-chip applications.