An Unexpected Chromophore-Solvent Reaction Leads to Bicomponent Aggregation-Induced Phosphorescence
An Unexpected Chromophore-Solvent Reaction Leads to Bicomponent Aggregation-Induced Phosphorescence
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发色团与溶剂的非预期反应导致双组分聚集诱导磷光
DOI：
10.1002/anie.202000865
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发表时间：
2020-04-21
影响因子：
16.6
通讯作者：
Zhang, Guoqing
中科院分区：
文献类型：
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作者：
Chen, Biao;Huang, Wenhuan;Zhang, Guoqing
具有持久室温磷光（RTP）的有机发光体已得到广泛的应用。然而，许多RTP发光体在结晶状态下容易发生严重猝灭。在此，我们报告了一种构建供体-sp(3)-受体型发光体的策略，该发光体表现出聚集诱导发射(AIE)，而供体-sp(2)-受体对应结构表现出非发射固态。出乎意料的是，我们发现微量（0.01％）结构相似的衍生物（通过与DMF溶剂的副反应产生）可以诱导强RTP，绝对RTP产率高达25.4％，寿命为48毫秒，尽管该物质本身不显示RTP。基于单晶 XRD 的计算表明，结构相似性导致的 n-sigma* 轨道相互作用可能是双组分体系中强 RTP 的原因。这项研究为有机分子系统的多组分固态 RTP 材料的设计提供了新的见解。
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(3)-acceptor type luminogen that exhibits aggregation-induced emission (AIE) while the donor-sp(2)-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-sigma* 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.