Disclosed is a phosphorescent organometallic complex having: a 6-membered aromatic heterocycle having a nitrogen atom; iridium or platinum to which the nitrogen atom coordinates; and an aryl group which is bonded to an α-carbon of the nitrogen atom and is ortho-metalated with the iridium or platinum, where at least one of the aromatic heterocycle and the aryl group has an alicyclic hydrocarbon having an intramolecular carbon-carbon bridged bond as a substituent. The ability of the bulky structure of the alicyclic hydrocarbon to inhibit aggregation of the organometallic complex, concerted with the strong electron-donating property of the alicyclic hydrocarbon to the aromatic heterocycle or the aryl group, contributes to the increase in absorption coefficient and phosphorescent efficiency of the organometallic complex. The improved absorption coefficient and the phosphorescent efficiency allow the formation of a light-emitting element with excellent external quantum efficiency over 25%.
本发明揭示了一种
磷光有机
金属配合物,其具有:含有氮原子的6元芳香杂环;氮原子与
铱或
铂配位;以及与氮原子的α-碳键合并与
铱或
铂发生邻位
金属化的芳基基团,其中至少有芳香杂环和芳基基团中的一个具有作为取代基的脂
环烃,其具有分子内碳-碳桥键。脂
环烃的臃肿结构能够抑制有机
金属配合物的聚集,与脂
环烃对芳香杂环或芳基基团的强电子给体性质协同作用,有助于提高有机
金属配合物的吸收系数和
磷光效率。改进的吸收系数和
磷光效率使得形成的发光元件具有优异的外部量子效率超过25%。