Enhancing Ultralong Organic Phosphorescence by Effective π‐Type Halogen Bonding,Advanced Functional Materials

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Enhancing Ultralong Organic Phosphorescence by Effective π‐Type Halogen Bonding
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-09 , DOI: 10.1002/adfm.201705045
Suzhi Cai ₁ , Huifang Shi ₁ , Dan Tian ₁ , Huili Ma ₁ , Zhichao Cheng ₁ , Qi Wu ₁ , Mingxing Gu ₁ , Ling Huang ₁ , Zhongfu An ₁ , Qian Peng ₂ , Wei Huang _{1,

3}

Affiliation

Efficient ultralong organic phosphorescent materials have potential applications in some fields, such as bioimaging, anti‐counterfeiting, and sensors. Nevertheless, phosphorescence efficiencies of metal‐free organic materials are low due to weak spin–orbit coupling and vigorous nonradiative transitions under ambient conditions. Here a chemical strategy to improve phosphorescence efficiency with intermolecular π‐type halogen bonding construction via isomerism is presented. X‐ray single crystal analysis reveals that different halogen bonding is formed among p‐BrTCz, m‐BrTCz, and o‐BrTCz crystals. Phosphorescence efficiency of m‐BrTCz in solid can reach 13.0%, seven times of o‐BrTCz in solid owing to effective π‐type halogen bonding, which is further confirmed by theoretical calculations. However, ultralong phosphorescence lifetimes are little affected, 155, 120, and 156 ms for p‐BrTCz, m‐BrTCz, and o‐BrTCz in the solid state, respectively. Furthermore, a simple pattern for data encryption and decryption is first demonstrated under sunlight. This result will provide an approach for improving the phosphorescent efficiency of metal‐free organic phosphors with ultralong luminescence.

中文翻译：

通过有效的π型卤素键增强超长有机磷光

高效的超长有机磷光材料在某些领域具有潜在的应用前景，例如生物成像，防伪和传感器。然而，由于弱自旋轨道耦合和在环境条件下剧烈的非辐射跃迁，不含金属的有机材料的磷光效率很低。本文提出了一种通过异构通过分子间π型卤素键结构提高磷光效率的化学策略。X射线单晶分析表明，在p -BrTCz，m -BrTCz和o- BrTCz晶体之间形成了不同的卤素键。固体中m -BrTCz的磷光效率可以达到13.0％，是o的7倍由于有效的π型卤素键，固体中的‐BrTCz得到了理论计算的进一步证实。然而，超长磷光寿命几乎不受影响，固态的p -BrTCz，m -BrTCz和o -BrTCz分别为155、120和156 ms 。此外，首先在阳光下展示了一种简单的数据加密和解密模式。该结果将提供一种改善具有超长发光的无金属有机磷光体的磷光效率的方法。

更新日期：2018-01-09

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