Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China.
J Am Chem Soc. 2017 Jul 12;139(27):9341-9349. doi: 10.1021/jacs.7b04788. Epub 2017 Jul 3.
A new class of brightly blue-green-emitting arylgold(III) complexes has been synthesized, characterized, and applied as phosphorescent dopants in the fabrication of solution-processable and vacuum-deposited organic light-emitting devices (OLEDs). These arylgold(III) complexes can be readily synthesized by reacting the corresponding arylboronic acids with the gold(III) precursor complexes in a one-pot Suzuki-Miyaura coupling reaction. When compared to the structurally related alkynylgold(III) complex, arylgold(III) complexes 1 and 2 exhibit much higher photoluminescence quantum yields in solution state. High photoluminescence quantum yields are also observed in solid-state thin films. More importantly, the solid-state emission spectra show strong resemblance to those in solution, irrespective of the dopant concentration, leading to significant improvement in the color purity of the OLEDs by suppressing any excimer emission resulting from the π-stacking of the tridentate ligand. High performance solution-processable and vacuum-deposited blue-green-emitting OLEDs have also been realized, with maximum external quantum efficiencies of 7.3% and 14.7%, respectively, representing the first demonstration of efficient blue-green-emitting OLEDs based on cyclometalated arylgold(III) complexes.
一类新型亮蓝色-绿色电致磷光芳基金属（III）配合物已被合成、表征，并作为磷光掺杂剂应用于溶液加工和真空沉积有机发光器件（OLEDs）的制备中。这些芳基金属（III）配合物可通过将相应的芳基硼酸与金（III）前体配合物在一锅 Suzuki-Miyaura 偶联反应中反应来轻易合成。与结构相关的炔基金属（III）配合物相比，芳基金属（III）配合物 1 和 2 在溶液状态下表现出更高的光致发光量子产率。在固态薄膜中也观察到高的光致发光量子产率。更重要的是，固态发射光谱与溶液中的光谱非常相似，无论掺杂浓度如何，通过抑制由于三齿配体的π堆积而导致的任何激基复合物发射，从而显著提高 OLED 的色纯度。还实现了高性能的溶液加工和真空沉积的蓝绿色电致发光 OLED，其最大外量子效率分别为 7.3%和 14.7%，这代表了基于金属环戊二烯基芳基金属（III）配合物的高效蓝绿色电致发光 OLED 的首次展示。
