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首页> 外文会议>Symposium on Luminescent Materials, held April 5-8, 1999, San Francisco, California, U.S.A. >Optical activity and order in luminescent langmuir-blodgett poly (p-phenylene vinylene) films
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Optical activity and order in luminescent langmuir-blodgett poly (p-phenylene vinylene) films

机译：发光朗缪尔-布洛杰特（对亚苯基亚乙烯基）薄膜的光学活性和有序

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摘要

Langmuir-Blodgett (LB) PPV films of poly(p-phenylene vinylene) (PPV) have been obtained using a mixture of a PPV precursor, poly(xylylidene tetrahydrothiophenium chloride) (PTHT), with the sodium salt of dodecylsulfonic acid (BDSA) as the spreading solution. Spincoated films were prepared in order to compare their properties with those of LB films. A large circular dichroism was observed for LB films but not for spin-coated ones. Optical activity of PPV films was characterized by circular dichroism technique, while optical properties were evaluated by optical absorption and luminescence measurements at various temperatures. Overall, the results obtained allowed us to conclude that the layer-by-layer LB process yields a high degree of molecular order in the PPV films with low interchain interaction. Polarized absorption and circular dichroism measurements demonstrate a preferential chain orientation along the dipping direction in the LB processing. The origin of the CD in the PPV-LB can be ascribed to convenient packing of individual monolayers given by the Z-type deposition.
机译：使用PPV前体，聚二甲苯基四氢噻吩氯化物（PTHT）和十二烷基磺酸钠盐（BDSA）的混合物获得了聚对亚苯基亚乙烯基（PPV）的Langmuir-Blodgett（LB）PPV膜作为传播解决方案。制备旋涂膜是为了将其性能与LB膜进行比较。 LB膜观察到较大的圆二色性，而旋涂膜则没有。 PPV膜的光学活性通过圆二色性技术进行了表征，而光学性能则通过在各种温度下的光吸收和发光测量来评估。总的来说，获得的结果使我们可以得出结论：逐层LB工艺在链间相互作用低的PPV膜中产生了高度的分子有序性。偏振吸收和圆二色性测量结果表明，在LB处理中，沿浸入方向的链优先取向。 PPV-LB中CD的起源可归因于Z型沉积所赋予的单个单层的便利堆积。

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