The object of the present invention is to provide an organic EL element, and the like utilizing the aforementioned organometallic complex that shows phosphorescence light emission and that has excellent light-emitting efficiency, thermal and electrical stability, and long drive lifetime. The organic EL element of the present invention contains organometallic complex has properties comprising; a metal atom and, a terdentate ligand that is terdentate-bonded to this metal atom through two nitrogen atoms and a carbon atom, and the carbon atom is situated in-between these two nitrogen atoms, and a monodentate ligand that is monodentate-bonded to the aforementioned metal atom through one of the atom selected from a N atom, an O atom and a S atom, and also comprises a ring structure having a substituent group or substituted by a halogen atom at the position, excluding the para-position as compared with the metal atom.
本发明的目的是提供一种有机EL元件,以及利用上述有机
金属配合物,该配合物具有
磷光发射和出色的发光效率、热电稳定性和长期驱动寿命。本发明的有机EL元件含有具有以下性质的有机
金属配合物:
金属原子和三齿
配体,该三齿
配体通过两个氮原子和一个碳原子与该
金属原子形成三齿配位键,且该碳原子位于这两个氮原子之间;以及单齿
配体,该单齿
配体通过从N原子、O原子和S原子中选择的一种原子之一与上述
金属原子形成单齿配位键,并且还包括在该
金属原子相对位置除去对位的位置上具有取代基或被卤素原子取代的环结构。