Commercial dyes are extensively utilized to stain specific phases for the visualization applications in emulsions and bioimaging. In general, dyes emit only one specific fluorescence signal and thus, in order to stain various phases and/or interfaces, one needs to incorporate multiple dyes and carefully consider their compatibility to avoid undesirable interactions with each other and with the components in the system. Herein, surfactant‐type, perylene‐endcapped fluorescent conjugated polymers that exhibit two different emissions are reported, which are cyan in water and red at oil–water interfaces. The interfacially distinct red emission results from enhanced exciton migration from the higher‐bandgap polymer backbone to the lower‐bandgap perylene endgroup. The confocal microscopy images exhibit the localized red emission exclusively from the circumference of oil droplets. This exciton migration and dual fluorescence of the polymers in different physical environments can provide a new concept of visualization methods in many amphiphilic colloidal systems and bioimaging.

中文翻译：

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通过共轭聚合物的激子迁移，水包油型乳液具有不同的界面荧光

商业染料被广泛地用于染色特定的相，以用于乳剂和生物成像中的可视化应用。通常，染料仅发射一种特定的荧光信号，因此，为了染色各种相和/或界面，需要掺入多种染料并仔细考虑它们的相容性，以避免彼此之间以及与系统中各组分的不良相互作用。在此，据报道，表面活性剂型，per封端的荧光共轭聚合物表现出两种不同的发射，在水中为青色，在油水界面为红色。界面不同的红色发射是由于激子从高带隙聚合物主链向低带隙per per端基迁移的增强所致。共聚焦显微镜图像仅从油滴周围显示出局部红色发射。聚合物在不同物理环境中的这种激子迁移和双重荧光可以为许多两亲性胶体系统和生物成像提供可视化方法的新概念。