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Self-organized MEH-PPV domains in a TPU matrix and the consequences to the luminescence spectra

机译:TPU矩阵中的自组织MEH-PPV域及其对发光光谱的影响

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摘要

Self-sustained cast films formed from heterogeneous blends of poly(2-methoxy-5-(2'-ethyl-hexyloxy)1,4-phenylenevinylene) (MEH-PPV) conjugated polymer and thermoplastic polyurethane (TPU) were investigated by photoluminescence (PL) and scanning electron microscopy (SEM). A blue shift is observed for the pure electronic transition PL peak (E-00) with decreasing MEH-PPV concentration. The two clear shoulders in the PL spectra at higher energy than the E-00 peak appear due to the formation of small conjugation segments of the MEH-PPV molecules at the interface of the spherical MEH-PPV domains. This assumption and the origin of the blue shift were confirmed by correlating the average size of the MEH-PPV domains, observed from SEM images, and the analysis of the PL spectra at low temperatures. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 109: 3659-3664, 2008.
机译:通过光致发光研究了由聚(2-甲氧基-5-(2'-乙基-己氧基)1,4-亚苯基亚乙烯基)(MEH-PPV)共轭聚合物和热塑性聚氨酯(TPU)的异质共混物形成的自持流延膜( PL)和扫描电子显微镜(SEM)。随着MEH-PPV浓度的降低,观察到纯电子跃迁PL峰(E-00)发生蓝移。由于在球形MEH-PPV域的界面处形成了MEH-PPV分子小的共轭链段,因此在PL光谱中出现了比E-00峰高的两个清晰的肩峰。通过关联从SEM图像观察到的MEH-PPV域的平均大小以及在低温下对PL光谱的分析,可以确认这一假设和蓝移的起源。 (c)2008 Wiley Periodicals,Inc. J Appl Polym Sci 109:3659-3664,2008。

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