Chen Biao, Huang Wenhuan, Su Hao, Miao Hui, Zhang Xuepeng, Zhang Guoqing
Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China.
Angew Chem Int Ed Engl. 2020 Jun 15;59(25):10023-10026. doi: 10.1002/anie.202000865. Epub 2020 Apr 21.
Organic luminogens with persistent room-temperature phosphorescence (RTP) have found a wide range of applications. However, many RTP luminogens are prone to severe quenching in the crystalline state. Herein, we report a strategy to construct a donor-sp -acceptor type luminogen that exhibits aggregation-induced emission (AIE) while the donor-sp -acceptor counterpart structure exhibits a non-emissive solid state. Unexpectedly, it was discovered that a trace amount (0.01 %) of the structurally similar derivative, produced by a side reaction with the DMF solvent, could induce strong RTP with an absolute RTP yield up to 25.4 % and a lifetime of 48 ms, although the substance does not show RTP by itself. Single-crystal XRD-based calculations suggest that n-σ* orbital interactions as a result of structural similarity may be responsible for the strong RTP in the bicomponent system. This study provides a new insight into the design of multi-component, solid-state RTP materials from organic molecular systems.
具有持久室温磷光（RTP）的有机发光剂已得到广泛应用。然而，许多RTP发光剂在结晶状态下容易发生严重猝灭。在此，我们报道了一种构建供体-sp-受体型发光剂的策略，该发光剂表现出聚集诱导发光（AIE），而供体-sp-受体对应结构在固态时不发光。出乎意料的是，发现与DMF溶剂发生副反应生成的痕量（0.01%）结构相似衍生物，尽管该物质本身不显示RTP，但能诱导出绝对RTP产率高达25.4%且寿命为48 ms的强RTP。基于单晶XRD的计算表明，由于结构相似导致的n-σ*轨道相互作用可能是双组分体系中强RTP的原因。这项研究为从有机分子体系设计多组分固态RTP材料提供了新的见解。
