Fleetham Tyler, Ji Yunlong, Huang Liang, Fleetham Trenten S, Li Jian
Materials Science and Engineering , Arizona State University , Tempe , AZ 85287 , USA . Email:
Chem Sci. 2017 Dec 1;8(12):7983-7990. doi: 10.1039/c7sc02512b. Epub 2017 Sep 11.
A tetradentate Pd(ii) complex, Pd3O3, which exhibits highly efficient excimer emission is synthesized and characterized. Pd3O3 can achieve blue emission despite using phenyl-pyridine emissive ligands which have been a mainstay of stable green and red phosphorescent emitter designs, making Pd3O3 a good candidate for stable blue or white OLEDs. Pd3O3 exhibits strong and efficient phosphorescent excimer emission expanding the excimer based white OLEDs beyond the sole class of Pt complexes. Devices of Pd3O3 demonstrate peak external quantum efficiencies as high as 24.2% and power efficiencies of 67.9 Lm per W for warm white devices. Furthermore, Pd3O3 devices in a carefully designed stable structure achieved a device operational lifetime of nearly 3000 h at 1000 cd m without any outcoupling enhancement while simultaneously achieving peak external quantum efficiencies of 27.3% and power efficiencies over 81 Lm per W.
合成并表征了一种具有高效准分子发射的四齿钯（II）配合物Pd3O3。尽管使用的苯基吡啶发光配体一直是稳定的绿色和红色磷光发射体设计的主要成分，但Pd3O3仍能实现蓝色发射，这使得Pd3O3成为稳定的蓝色或白色有机发光二极管的良好候选材料。Pd3O3表现出强烈且高效的磷光准分子发射，将基于准分子的白色有机发光二极管扩展到铂配合物之外的类别。Pd3O3器件在暖白色器件中展示出高达24.2%的峰值外量子效率和每瓦67.9流明的功率效率。此外，具有精心设计的稳定结构的Pd3O3器件在1000 cd/m²下实现了近3000小时的器件工作寿命，且没有任何出耦合增强，同时实现了27.3%的峰值外量子效率和超过每瓦81流明的功率效率。
