Wang Tao, Hu Zhubin, Nie Xiancheng, Huang Linkun, Hui Miao, Sun Xiang, Zhang Guoqing
Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei, China.
Division of Arts and Science, NYU-ECNU Center for Computational Chemistry, NYU Shanghai, Shanghai, China.
Nat Commun. 2021 Mar 1;12(1):1364. doi: 10.1038/s41467-021-21676-5.
Aggregation-induced emission (AIE) has proven to be a viable strategy to achieve highly efficient room temperature phosphorescence (RTP) in bulk by restricting molecular motions. Here, we show that by utilizing triphenylamine (TPA) as an electronic donor that connects to an acceptor via an sp linker, six TPA-based AIE-active RTP luminophores were obtained. Distinct dual phosphorescence bands emitting from largely localized donor and acceptor triplet emitting states could be recorded at lowered temperatures; at room temperature, only a merged RTP band is present. Theoretical investigations reveal that the two temperature-dependent phosphorescence bands both originate from local/global minima from the lowest triplet excited state (T). The reported molecular construct serves as an intermediary case between a fully conjugated donor-acceptor system and a donor/acceptor binary mix, which may provide important clues on the design and control of high-freedom molecular systems with complex excited-state dynamics.
聚集诱导发光（AIE）已被证明是一种通过限制分子运动在本体中实现高效室温磷光（RTP）的可行策略。在此，我们表明，通过使用三苯胺（TPA）作为电子供体，经由sp连接基连接到受体，获得了六种基于TPA的AIE活性RTP发光体。在较低温度下，可以记录到分别从主要局域化的供体和受体三重态发射态发出的不同双磷光带；在室温下，仅存在一个合并的RTP带。理论研究表明，这两个与温度相关的磷光带均源自最低三重激发态（T）的局部/全局极小值。所报道的分子结构是完全共轭供体-受体体系和供体/受体二元混合物之间的中间情况，这可能为设计和控制具有复杂激发态动力学的高自由度分子体系提供重要线索。
