Phosphorescent κ<sup>3</sup>‐(N^C^C)‐Gold(III) Complexes: Synthesis, Photophysics, Computational Studies and Application to Solution‐Processable OLEDs
Hélène Beucher, Sudhir Kumar, Roopender Kumar, Estı́baliz Merino, Wei‐Hsu Hu, Gerrit Stemmler, Sergio Cuesta‐Galisteo, Jorge A. González, Léonard Bezinge, Jakub Jagielski, Chih‐Jen Shih, Cristina Nevado
Abstract
Abstract 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 3 ‐(N^C^C) template have been prepared and their photophysical properties have been characterized in detail. These compounds exhibit good photoluminescence quantum efficiency ( η PL ) 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 CE 46.6 cd.A −1 and η ext 14.0 %), thus showcasing the potential of these motifs for the low‐cost fabrication of display and illumination technologies.