Aggregation and continuous π-stacking have been the major obstacles hindering the fluorescence (FL) quantum yield (Φ_F) of perylene diimide (PDI) derivatives in the condensed phase. To prepare polymer microspheres with nearly unity Φ_F, in this work a POSS functionalized PDI derivative, POSS–PDI–POSS (PPP), was applied as the red fluorophore of poly(3-hydroxylbutyrate-co-3-hydroxyvalerate) (PHBV) and polystyrene (PS) microspheres. The electrosprayed PPP/PHBV and PPP/PS microspheres have unique hollow structures. Moreover, they show bright red FL under a fluorescence microscope. A photophysical study of the microspheres indicates a significant role of the polymer matrix in disrupting the aggregation state and the Φ_F of the embedded PPP fluorophore. Both the PPP/PHBV and the PPP/PS microspheres show higher Φ_F than most PDI materials in the condensed phase. The PPP/PHBV microspheres show Φ_F of 28%, whereas the PPP/PS microspheres give nearly unity Φ_F.

中文翻译：

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苝二亚胺染料掺杂 PS 和 PHVB 微球的形貌和荧光量子产率

聚集和连续 π 堆积一直是阻碍苝二亚胺 (PDI) 衍生物在凝聚相中的荧光 (FL) 量子产率 ( Φ _{F ) 的主要障碍。}为了制备具有几乎统一的Φ _F的聚合物微球，在这项工作中，使用 POSS 功能化 PDI 衍生物 POSS-PDI-POSS (PPP) 作为聚 (3-羟基丁酸酯-共-3-羟基戊酸酯) (PHBV)的红色荧光团和聚苯乙烯 (PS) 微球。电喷雾 PPP/PHBV 和 PPP/PS 微球具有独特的中空结构。此外，它们在荧光显微镜下显示出明亮的红色 FL。微球的光物理研究表明聚合物基质在破坏聚集状态和Φ_F的嵌入式 PPP 荧光团。PPP/PHBV 和 PPP/PS 微球在凝聚相中都显示出比大多数 PDI 材料更高的Φ _F。PPP/PHBV 微球的Φ _F为 28%，而 PPP/PS 微球的Φ _F几乎为一。