Enhanced temporal stability of a highly efficient guest–host electro-optic polymer through a barrier layer assisted poling process
2012; Royal Society of Chemistry; Volume: 22; Issue: 38 Linguagem: Inglês
10.1039/c2jm33979j
ISSN1364-5501
AutoresSu Huang, Jingdong Luo, Zhian Jin, Xinghua Zhou, Zhengwei Shi, Alex K.‐Y. Jen,
Tópico(s)Liquid Crystal Research Advancements
ResumoSignificantly enhanced temporal stability of poled electro-optic (E-O) polymers could be achieved by inserting a thin sol–gel derived titanium dioxide (TiO2) barrier layer in the high electric field poling process. The resulting poled film can retain >90% of its original r33 value (169 pm V−1 at 1310 nm) after being annealed at 85 °C for 500 h. This is significantly higher (∼30%) compared to that obtained without the TiO2 layer. This barrier approach is also applicable to a variety of dielectric polymers although the degree of enhancement varies. The enhanced temporal stability of E-O polymers is attributed to reduced charge injection/accumulation that improves the stability of screening charges for poled films.
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