Dou Xueyu, Zhu Tianwen, Wang Zhengshuo, Sun Wei, Lai Yueying, Sui Kunyan, Tan Yeqiang, Zhang Yongming, Yuan Wang Zhang
State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile Technology, College of Materials Science and Engineering, Qingdao University, No. 308 Ningxia Rd., Shinan District, Qingdao, 266071, China.
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Lab of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Minhang District, Shanghai, 200240, China.
Adv Mater. 2020 Nov;32(47):e2004768. doi: 10.1002/adma.202004768. Epub 2020 Oct 21.
Achieving persistent room-temperature phosphorescence (p-RTP), particularly those of tunable full-colors, from pure organic amorphous polymers is attractive but challenging. Particularly, those with tunable multicolor p-RTP in response to excitation wavelength and time are highly important but both fundamentally and technically underexplored. Here, a facile and general strategy toward color-tunable p-RTP from blue to orange-red based on amidation grafting of luminophores onto sodium alginate (SA) chains, resulting in amorphous polymers with distinct p-RTP and even impressively excitation-dependent and time-dependent afterglows is reported. p-RTP is associated with the unique semi-rigidified SA chains, effective hydrogen bonding network, and oxygen barrier properties of SA, whereas excitation-dependent and time-dependent afterglows should stem from the formation of diversified p-RTP emissive species with comparable but different lifetimes. These results outline a rational strategy toward amorphous smart luminophores with colorful, excitation-dependent, and time-dependent p-RTP, excellent solution processability, and film-forming ability for versatile applications.
从纯有机无定形聚合物中实现持久室温磷光（p-RTP），尤其是那些具有可调全色的磷光，既具有吸引力又具有挑战性。特别是，那些响应激发波长和时间而具有可调多色p-RTP的聚合物非常重要，但在基础和技术方面都未得到充分探索。在此，报道了一种基于将发光体酰胺化接枝到海藻酸钠（SA）链上的简便通用策略，可实现从蓝色到橙红色的颜色可调p-RTP，从而得到具有独特p-RTP的无定形聚合物，甚至具有令人印象深刻的激发依赖性和时间依赖性余辉。p-RTP与SA独特的半刚性链、有效的氢键网络以及SA的氧阻隔性能相关，而激发依赖性和时间依赖性余辉应源于形成具有可比但不同寿命的多种p-RTP发射物种。这些结果概述了一种合理的策略，用于制备具有彩色、激发依赖性和时间依赖性p-RTP、优异的溶液加工性和成膜能力的无定形智能发光体，以实现多功能应用。
