Li Ningyan, Yang Xipeng, Wang Binbin, Chen Panyi, Ma Yixian, Zhang Qianqian, Huang Yiyao, Zhang Yan, Lü Shaoyu
State Key Laboratory of Applied Organic Chemistry, Lanzhou Magnetic Resonance Center, Department of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
Adv Sci (Weinh). 2024 Aug;11(30):e2404698. doi: 10.1002/advs.202404698. Epub 2024 Jun 14.
Polymeric room-temperature phosphorescence (RTP) materials especially multicolor RTP systems hold great promise in concrete applications. A key feature in these applications is a triplet charge transfer transition. Aromatic electron donors and electron acceptors are often essential to ensure persistent RTP. There is much interest in fabricating non-aromatic charge-transfer-mediated RTP materials and it still remains a formidable challenge to achieve color-tunable RTP via charge transfer. Herein, a charge-transfer-mediated RTP material by embedding quinoline derivatives within a non-aromatic polymer matrix such as polyacrylamide (PAM) or polyvinyl alcohol (PVA) is developed. Through-space charge transfer (TSCT) is achieved upon alkali- or heat treatment to realize a long phosphorescence lifetime of up to 629.90 ms, high phosphorescence quantum yield of up to 20.51%, and a green-to-blue afterglow for more than 20 s at room temperature. This color-tunable RTP emerges from a nonaromatic polymer to single phosphor charge transfer that has rarely been reported before. This finding suggests that an effective and simple approach can deliver new color-tunable RTP materials for applications including multicolor display, information encryption, and gas detection.
聚合物室温磷光（RTP）材料，尤其是多色RTP体系，在具体应用中具有巨大潜力。这些应用中的一个关键特征是三重态电荷转移跃迁。芳香族电子供体和电子受体通常对于确保持久的RTP至关重要。制备非芳香族电荷转移介导的RTP材料备受关注，而通过电荷转移实现颜色可调的RTP仍然是一项艰巨的挑战。在此，通过将喹啉衍生物嵌入聚丙烯酰胺（PAM）或聚乙烯醇（PVA）等非芳香族聚合物基质中，开发了一种电荷转移介导的RTP材料。通过碱处理或热处理实现了空间电荷转移（TSCT），从而在室温下实现了长达629.90毫秒的长磷光寿命、高达20.51%的高磷光量子产率以及超过20秒的绿到蓝余辉。这种颜色可调的RTP源自非芳香族聚合物到单一磷光体的电荷转移，此前鲜有报道。这一发现表明，一种有效且简单的方法可以提供新的颜色可调RTP材料，用于多色显示、信息加密和气体检测等应用。
