Intrinsic persistent room temperature phosphorescence derived from 1H-benzo[f]indole itself as a guest

The influence of 1H-benzo[f]indole(Bd) and its derivatives on room temperature phosphorescence(RTP)has raised great concern since they were found to significantly affect RTP of the extensively studied carbazole(Cz) derivatives. However, the role of Bd itself existing in Cz-based or other doping systems was still unclear. In order to clarify its intrinsic phosphorescent property, Bd was introduced as a guest into different organic matrixes including substituted Cz derivatives and polymers. The phosphorescence located in 560–620 nm was confirmed to be derived from Bd itself, which can be detected whatever Bd was doped in the crystal or amorphous state of Cz derivatives. The suitable energy gap between Cz derivatives and Bd is the key to achieve ultralong RTP of Bd. Additionally, when doped in polymers with plenty of hydrogen bonds, RTP of Bd with lifetime over 280 ms was easily obtained. Among them, Bd@PHEMA(poly(hydroxyethyl methacrylate) exhibited superior phosphorescence, with yellow afterglow lasting for over 2.5 s. Therefore, this work demonstrated that a new organic RTP phosphor, Bd, is discovered, and ultralong RTP of Bd can be achieved not only doped in Cz derivatives but also in polymers as the hosts.

共轭多孔聚合物应用于近红外光热转换材料

近红外光热转换材料在光热治疗、光驱动智能器件等医学和能源领域受到广泛重视.本文以商业化芳香小分子为单体,通过一步简单的交联聚合方法制得了四种共轭多孔聚合物,并首次系统研究了它们的光热转换性能.结果表明,它们均具有灵敏的近红外光热响应性,且材料的光热转换效率与单体结构中共轭苯环数有很大关系,其中两种聚合物的光热转换效率可高达47%以上.同时,该类共轭多孔聚合物可作为光热转换填料,将其少量填充于热敏型形状记忆材料基体中,可实现远程、快速、定点调控材料形状的回复,且其对基材的热性质和力学性能影响很小.研究表明,由于其合成简单、原料易得、光热转换效率高,该共轭多孔聚合物是一类很有应用前景的光热转换材料.