Organic electroluminescent element, display device and lighting device

摘要

An organic electroluminescent device having high luminance and long-term stability under high temperature, high humidity conditions. This organic electroluminescent device is suppressed in voltage increase and generation of dark spots when driven at a constant current. Additionally, a display and an illuminating device can be made using the organic electroluminescent device. The organic electroluminescent device is characterized in that at least one of organic layers constituting the device is a light-emitting layer containing a host compound and a phosphorescent compound of the general formula:;
and the at least one organic layer has a film surface density of 1.10-1.25 g/cm3.

主权项

1. An organic electroluminescent element comprising a substrate having thereon an electrode and one or more organic layers,
wherein one of the organic layers is a light emitting layer which incorporates a phosphorescent compound represented by Formula (1) and a host compound, and the light emitting layer has a film surface density of 1.10-1.25 g/cm3: wherein R1 represents a substituent; Z represents a group of non-metallic atoms necessary to form a 5- to 7-membered ring; n1 represents an integer of 0 -5; B1-B5 each represents the following set (i) or set (ii): set (i) B1 and B3 are a nitrogen atom, and B2, B4, and B5 are a carbon atom, set (ii) B2 and B5 are a nitrogen atom, and B1, B3, and B4 are a carbon atom; M1 represents a metal in Groups 8-10 of a periodic table; X1 and X2 each represents a carbon atom, a nitrogen atom, or an oxygen atom; L1 represents a group of atoms which forms a bidentate ligand together with X1 and X2; m1 represents an integer of 1-3; and m2 represents an integer of 0-2, provided that a sum of m1 and m2 is an integer of 2 or 3.