Tang Man-Chung, Chan Mei-Yee, Yam Vivian Wing-Wah
Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China.
Chem Rev. 2021 Jul 14;121(13):7249-7279. doi: 10.1021/acs.chemrev.0c00936. Epub 2021 Jun 18.
The advancement of high-efficiency luminescent and thermally stable organometallic complexes has offered opportunities for the commercialization of metal phosphors for fabricating organic light-emitting devices (OLEDs). Since the first report on the potential use of iridium(III) and platinum(II) complexes for applications in OLEDs in the late 1990s, extensive efforts have been made by researchers on the development of various heavy metal-containing compounds with rich photophysical and luminescence properties and the engineering of device architectures to improve device efficiencies. Apart from the more well-studied iridium(III) and platinum(II) complexes, complexes of gold(III) recently have demonstrated their capabilities to serve as phosphorescent or thermally stimulated delayed phosphorescent or thermally activated delayed fluorescent emitters, and their promising performances in OLEDs have attracted growing interest in the past decade. Nowadays, complexes of gold(III) with emission energies ranging from sky-blue to near-infrared with high electroluminescence performances have been obtained. In addition, high-efficiency vacuum-deposited and solution-processed OLEDs with benchmark efficiencies comparable to those of the iridium(III) and platinum(II) complexes have been realized. This Focus Review summarizes the development of various series of luminescent gold(III) complexes to date and highlights important milestones in the development and advancement of gold(III)-based OLEDs. Focus will be made on the molecular design strategies for gold(III) emitters for application as dopants in OLEDs, including those fabricated by vacuum-deposition and solution-processing techniques.
高效发光且热稳定的有机金属配合物的发展为用于制造有机发光二极管（OLED）的金属磷光体商业化提供了机遇。自20世纪90年代末首次报道铱（III）和铂（II）配合物在OLED中的潜在应用以来，研究人员为开发具有丰富光物理和发光特性的各种含重金属化合物以及设计器件结构以提高器件效率付出了巨大努力。除了研究较多的铱（III）和铂（II）配合物外，金（III）配合物最近已证明其可作为磷光、热激发延迟磷光或热激活延迟荧光发射体，并且在过去十年中它们在OLED中的优异性能引起了越来越多的关注。如今，已获得发射能量范围从天蓝色到近红外且具有高电致发光性能的金（III）配合物。此外，还实现了具有与铱（III）和铂（II）配合物相当的基准效率的高效真空沉积和溶液处理OLED。本聚焦综述总结了迄今为止各类发光金（III）配合物的发展情况，并突出了基于金（III）的OLED发展进程中的重要里程碑。重点将放在用作OLED掺杂剂的金（III）发射体的分子设计策略上，包括通过真空沉积和溶液处理技术制造的OLED。
