Tang Man-Chung, Li Lok-Kwan, Lai Shiu-Lun, Cheung Wai-Lung, Ng Maggie, Wong Chun-Yin, Chan Mei-Yee, Yam Vivian Wing-Wah
Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
Angew Chem Int Ed Engl. 2020 Nov 16;59(47):21023-21031. doi: 10.1002/anie.202006911. Epub 2020 Sep 15.
Phosphorescent dopants are promising candidates for organic light-emitting diodes (OLEDs). Although it has been established that the out-coupling efficiency and overall performances of vacuum-deposited OLEDs can be significantly improved by a horizontal orientation of the dopants, no horizontally oriented gold(III) complexes have been reported to date. Herein, a novel class of tetradentate C^C^N^N ligand-containing gold(III) complexes with a preferential horizontal orientation successfully generated through a one-pot reaction is reported. These complexes demonstrate high photoluminescence quantum yields of 70 % and a high horizontal dipole ratio of 0.87 in solid-state thin films. Green-emitting OLEDs based on these complexes operate with a maximum external quantum efficiency of 20.6 % with an estimated out-coupling efficiency of around 30 %. A promising device stability has been achieved in the vacuum-deposited OLEDs, with operational half-lifetimes of around 37 500 h at 100 cd m .
磷光掺杂剂是有机发光二极管（OLED）的理想候选材料。尽管已经证实，通过掺杂剂的水平取向可以显著提高真空沉积OLED的外耦合效率和整体性能，但迄今为止尚未报道过水平取向的金（III）配合物。在此，报道了一类通过一锅法成功制备的具有优先水平取向的新型含四齿C^C^N^N配体的金（III）配合物。这些配合物在固态薄膜中表现出70%的高光致发光量子产率和0.87的高横向偶极比。基于这些配合物的绿色发光OLED的最大外部量子效率为20.6%，估计外耦合效率约为30%。在真空沉积的OLED中实现了有前景的器件稳定性，在100 cd m 下的工作半衰期约为37500 h。
