Beucher Hélène, Kumar Sudhir, Kumar Roopender, Merino Estíbaliz, Hu Wei-Hsu, Stemmler Gerrit, Cuesta-Galisteo Sergio, González Jorge A, Bezinge Léonard, Jagielski Jakub, Shih Chih-Jen, Nevado Cristina
Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zürich, Switzerland.
Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH-Zürich, 8093, Zürich, Switzerland.
Chemistry. 2020 Dec 23;26(72):17604-17612. doi: 10.1002/chem.202003571. Epub 2020 Nov 19.
Efficient OLED devices have been fabricated using organometallic complexes of platinum group metals. Still, the high material cost and low stability represent central challenges for their application in commercial display technologies. Based on its innate stability, gold(III) complexes are emerging as promising candidates for high-performance OLEDs. Here, a series of alkynyl-, N-heterocyclic carbene (NHC)- and aryl-gold(III) complexes stabilized by a κ -(N^C^C) template have been prepared and their photophysical properties have been characterized in detail. These compounds exhibit good photoluminescence quantum efficiency (η ) of up to 33 %. The PL emission can be tuned from sky-blue to yellowish green colors by variations on both the ancillary ligands as well as on the pincer template. Further, solution-processable OLED devices based on some of these complexes display remarkable emissive properties (η 46.6 cd.A and η 14.0 %), thus showcasing the potential of these motifs for the low-cost fabrication of display and illumination technologies.
利用铂族金属的有机金属配合物制备了高效的有机发光二极管（OLED）器件。然而，高材料成本和低稳定性仍是其在商业显示技术中应用的主要挑战。基于其固有的稳定性，金（III）配合物正成为高性能OLED的有前途的候选材料。在此，制备了一系列由κ -（N^C^C）模板稳定的炔基、N-杂环卡宾（NHC）和芳基金（III）配合物，并详细表征了它们的光物理性质。这些化合物表现出高达33%的良好光致发光量子效率（η）。通过改变辅助配体以及钳形模板，可以将PL发射从天蓝色调至黄绿色。此外，基于其中一些配合物的可溶液加工的OLED器件表现出显著的发光特性（η 46.6 cd.A和η 14.0%），从而展示了这些结构在低成本制造显示和照明技术方面的潜力。
