Shi Huifang, Song Lulu, Ma Huili, Sun Chen, Huang Kaiwei, Lv Anqi, Ye Wenpeng, Wang He, Cai Suzhi, Yao Wei, Zhang Yujian, Zheng Ruilin, An Zhongfu, Huang Wei
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China.
Department of Materials Chemistry , Huzhou University , East 2nd Ring Road, No. 759 , Huzhou 313000 , China.
J Phys Chem Lett. 2019 Feb 7;10(3):595-600. doi: 10.1021/acs.jpclett.8b03712. Epub 2019 Jan 25.
Metal-free organic phosphorescent materials have attracted considerable attention in the fields of organic electronics and bioelectronics. However, it remains a great challenge to achieve organic phosphors with high quantum efficiency in a single-component system. We designed and synthesized two organic phosphors (PDCz and PDBCz) with an ultralong organic phosphorescence (UOP) feature. Both molecules showed ultralong emission lifetime of >200 ms. For PDBCz crystal, it was found that the absolute phosphorescence quantum efficiency reaches up to 38.1%. Combining the experimental and theoretical studies, the highly efficient UOP was mainly attributed to the intramolecular space heavy-metal effect, which facilitates the spin-orbit coupling between singlet and triplet excited states to effectively promote the intersystem crossing. This study will provide a new platform to rationally design highly efficient UOP materials and show its potential in the field of flexible electronics.
无金属有机磷光材料在有机电子学和生物电子学领域引起了广泛关注。然而，在单一组分体系中实现具有高量子效率的有机磷光体仍然是一个巨大的挑战。我们设计并合成了两种具有超长有机磷光（UOP）特性的有机磷光体（PDCz和PDBCz）。两种分子都表现出大于200 ms的超长发射寿命。对于PDBCz晶体，发现其绝对磷光量子效率高达38.1%。结合实验和理论研究，高效的UOP主要归因于分子内空间重金属效应，这有助于单重态和三重态激发态之间的自旋轨道耦合，从而有效地促进系间窜越。本研究将为合理设计高效UOP材料提供一个新平台，并展示其在柔性电子学领域的潜力。
