Abstract Luminescent poly p-phenylene vinylene (PPV) thin films were produced by the layer-by-layer technique, using organic dyes as the counter ion. It was observed that, when dyes with azo groups are incorporated in the PPV polymeric chains, the fluorescence intensity can be substantially increased by the photo-irradiation of the film with a linearly polarized laser beam. The data show that such emission enhancement is due to the alignment of the dye molecules caused by the photo-isomerization of the azo groups. This process leads to an absorbance of the dyes that is dependent both of the photo-irradiation dose and the polarization direction of the irradiation source, which affects the fluorescence emitted by the polymer. Thus, the incorporation of azo dyes can be used to modulate the fluorescence response of polymeric thin films.

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通过偶氮染料的光异构化控制发光薄膜的荧光强度

摘要 采用有机染料作为抗衡离子，采用逐层技术制备发光聚对苯撑乙烯（PPV）薄膜。观察到，当具有偶氮基团的染料掺入 PPV 聚合物链时，荧光强度可以通过用线性偏振激光束光照射薄膜而显着增加。数据表明，这种发射增强是由于偶氮基团的光异构化引起的染料分子的排列。该过程导致染料的吸光度取决于光辐射剂量和辐射源的偏振方向，这会影响聚合物发射的荧光。因此，偶氮染料的掺入可用于调节聚合物薄膜的荧光响应。