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%.
本发明涉及一种
磷光有机
金属配合物,包括:含有一个氮原子的6元芳杂环;与氮原子配位的
铱或
铂;以及与氮原子的α-碳键合并与
铱或
铂发生正
金属化的芳基基团,其中芳杂环和芳基基团中至少有一个含有内环碳-碳桥键的脂
环烃作为取代基。脂
环烃的笨重结构能够抑制有机
金属配合物的聚集,同时脂
环烃对芳杂环或芳基基团的强电子给体性有助于提高配合物的吸收系数和
磷光效率。改进后的吸收系数和
磷光效率使得可以形成外部量子效率超过25%的发光元件。