Perevedentsev Aleksandr, Chander Nathan, Kim Ji-Seon, Bradley Donal D C
Department of Materials Eidgenössische Technische Hochschule (ETH) Zürich Vladimir-Prelog-Weg 5 Zürich 8093 Switzerland; Department of Physics and Centre for Plastic Electronics Imperial College London, South Kensington Campus London SW7 2AZ United Kingdom.
Department of Physics and Centre for Plastic Electronics Imperial College London, South Kensington Campus London SW7 2AZ United Kingdom.
J Polym Sci B Polym Phys. 2016 Oct 1;54(19):1995-2006. doi: 10.1002/polb.24106. Epub 2016 Jun 29.
Poly(9,9-dioctylfluorene) (PFO) is a widely studied blue-emitting conjugated polymer, the optoelectronic properties of which are strongly affected by the presence of a well-defined chain-extended "β-phase" conformational isomer. In this study, optical and Raman spectroscopy are used to systematically investigate the properties of PFO thin films featuring a varied fraction of β-phase chain segments. Results show that the photoluminescence quantum efficiency (PLQE) of PFO films is highly sensitive to both the β-phase fraction and the method by which it was induced. Notably, a PLQE of ∼69% is measured for PFO films possessing a ∼6% β-phase fraction induced by immersion in solvent/nonsolvent mixtures; this value is substantially higher than the average PLQE of ∼55% recorded for other β-phase films. Furthermore, a linear relationship is observed between the intensity ratios of selected Raman peaks and the β-phase fraction determined by commonly used absorption calibrations, suggesting that Raman spectroscopy can be used as an alternative means to quantify the β-phase fraction. As a specific example, spatial Raman mapping is used to image a mm-scale β-phase stripe patterned in a glassy PFO film, with the extracted β-phase fraction showing excellent agreement with the results of optical spectroscopy. © 2016 The Authors. Journal of Polymer Science Part B: Polymer Physics Published by Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. , , 1995-2006.
聚（9,9 - 二辛基芴）（PFO）是一种被广泛研究的蓝色发光共轭聚合物，其光电性能受到一种定义明确的链延伸“β相”构象异构体的强烈影响。在本研究中，利用光学和拉曼光谱系统地研究了具有不同β相链段比例的PFO薄膜的性能。结果表明，PFO薄膜的光致发光量子效率（PLQE）对β相比例及其诱导方法都高度敏感。值得注意的是，对于通过浸入溶剂/非溶剂混合物诱导出约6%β相比例的PFO薄膜，测得的PLQE约为69%；该值显著高于其他β相薄膜记录的约55%的平均PLQE。此外，观察到选定拉曼峰的强度比与通过常用吸收校准确定的β相比例之间存在线性关系，这表明拉曼光谱可作为量化β相比例的替代方法。作为一个具体例子，使用空间拉曼映射对玻璃态PFO薄膜中图案化的毫米级β相条纹进行成像，提取的β相比例与光谱学结果显示出极好的一致性。© 2016作者。《聚合物科学杂志B辑：聚合物物理学》由威利期刊公司出版。J. Polym. Sci., Part B: Polym. Phys.,, 1995 - 2006。
