超支化聚苯硫醚溶液的光诱导瑞利光散射:光散射开关模型。

IF 4.7 Q1 POLYMER SCIENCE ACS polymers Au Pub Date : 2024-11-08 eCollection Date: 2024-12-11 DOI:10.1021/acspolymersau.4c00044
Usha Kalra, James E Hanson
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引用次数: 0

摘要

本文描述了超支化聚亚苯基硫醚材料的异常光物理和散射行为。这些材料在基态和激发态下都显示出芳香族单体单元的 π 系统之间的相互作用,从而产生了宽广的光吸收和发射范围。这些材料还显示出不寻常的散射行为;这归因于单体单元相互作用导致的非定位激发态散射增强。在共振瑞利散射和二阶散射光谱中可以看到这种增强的散射。利用这些材料构建基于光诱导散射的开关的能力得到了证实:使用 ∼400 nm 的激光可使 700 nm 光的散射增加约 20%。
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Photoinduced Rayleigh Light Scattering by Hyperbranched Poly(phenylene sulfide) Solutions: A Model for a Light Scattering Switch.

Unusual photophysical and scattering behavior is described for hyperbranched poly(phenylene sulfide) materials. These materials show interactions between the π systems of the aromatic monomer units in both ground and excited states, resulting in broad ranges for absorption and emission of light. The materials also display unusual scattering behavior; this is attributed to enhanced scattering by delocalized excited states resulting from the monomer unit interactions. This enhanced scattering is seen in the resonance Rayleigh scattering and second order scattering spectra. The ability to use these materials to construct a switch based on photoinduced scattering is demonstrated: application of ∼400 nm laser light increased scattering of 700 nm light by approximately 20%.

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