Ying Ao, Gong Shaolong
Hubei Key Lab on Organic and, Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, China.
Chemistry. 2023 Oct 23;29(59):e202301885. doi: 10.1002/chem.202301885. Epub 2023 Sep 8.
Coinage metal (gold, silver, and copper) complexes are attractive candidates to substitute the widely studied noble metal complexes, such as, iridium(III) and platinum(II), as luminescent materials in organic light-emitting diodes (OLEDs). However, the development of coinage metal complexes exhibiting high emission quantum yields and short exciton lifetimes is still a formidable challenge. In the past few years, coinage metal complexes featuring a carbene-metal-amide (CMA) motif have emerged as a new class of luminescent materials in OLEDs. Thanks to the coinage metal-bridged linear geometry, coplanar conformation, and the formation of excited states with dominant ligand-to-ligand charge transfer character and reduced metal d-orbital participation, most CMA complexes have high radiative rates via thermally activated delayed fluorescence. Currently, the family of CMA complexes have rapidly evolved and remarkable progresses in CMA-based OLEDs have been made. Here, a Concept article on CMA complexes is presented, with a focus on molecular design principles, the correlation between molecular structure/conformation and optoelectronic properties, as well as OLED performance. The future prospects of CMA complexes are also discussed.
铜族金属（金、银和铜）配合物是替代广泛研究的贵金属配合物（如铱（III）和铂（II））作为有机发光二极管（OLED）发光材料的有吸引力的候选物。然而，开发具有高发射量子产率和短激子寿命的铜族金属配合物仍然是一项艰巨的挑战。在过去几年中，具有卡宾-金属-酰胺（CMA） motif的铜族金属配合物已成为OLED中一类新型的发光材料。由于铜族金属桥连的线性几何结构、共平面构象以及具有主导的配体到配体电荷转移特性和减少的金属d轨道参与的激发态的形成，大多数CMA配合物通过热激活延迟荧光具有高辐射率。目前，CMA配合物家族迅速发展，基于CMA的OLED取得了显著进展。在此，发表一篇关于CMA配合物的概念文章，重点关注分子设计原理、分子结构/构象与光电性能之间的相关性以及OLED性能。还讨论了CMA配合物的未来前景。
