Organic electroluminescent display device having superior characteristics at high temperature

An organic electroluminescent display device comprising a substrate, a first electrode and a second electrode formed on the substrate, and an organic film layer comprising at least one emitting layer between the first electrode and the second electrode. The emitting layer includes at least one phosphorescent dopant, and the dopant is represented by L3M or L2ML', wherein the M is a transition metal selected from the group consisting of Ir, Pt, Zn and Os, the L and L' are bidendate ligands coordinated with carbon and nitrogen, and at least one of the L and L' has 15 or more carbon atoms in the ligand.