Li Jiayi, Wang Liding, Zhao Zifeng, Li Xiaoyue, Yu Xiao, Huo Peihao, Jin Qionghua, Liu Zhiwei, Bian Zuqiang, Huang Chunhui
Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing Engineering Technology Research Centre of Active Display, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Department of Chemistry, Capital Normal University, Beijing, 100048, China.
Angew Chem Int Ed Engl. 2020 May 18;59(21):8210-8217. doi: 10.1002/anie.201916379. Epub 2020 Mar 6.
As a kind of photoluminescent material, Cu complexes have many advantages such as adjustable emission, variable structures, and low cost, attracting attention in many fields. In this work, two novel two-coordinate Cu -N-heterocyclic carbene complexes were synthesized, and they exhibit unique dual emission properties, fluorescence and phosphorescence. The crystal structure, packing mode, and photophysical properties under different conditions were systematically studied, proving the emissive mechanism to be the locally excited state of the carbazole group. Based on this mechanism, ultralong room-temperature phosphorescence (RTP) with a lifetime of 140 ms is achieved by selective deuteration of the carbazole group. These results deepen the understanding of the luminescence mechanism and design strategy for two-coordinate Cu complexes, and prove their potential in applications as ultralong RTP materials.
作为一种光致发光材料，铜配合物具有许多优点，如发射可调节、结构可变和成本低等，在许多领域引起了关注。在这项工作中，合成了两种新型的二配位铜-氮杂环卡宾配合物，它们表现出独特的双重发射特性，即荧光和磷光。系统研究了不同条件下的晶体结构、堆积模式和光物理性质，证明发射机制为咔唑基团的局域激发态。基于这一机制，通过对咔唑基团进行选择性氘代，实现了寿命为140 ms的超长室温磷光（RTP）。这些结果加深了对二配位铜配合物发光机制和设计策略的理解，并证明了它们作为超长RTP材料在应用中的潜力。
