Patent ID: 8920942
Filing Date: 2014-12-30
Classification: C09K,H01L,H05B,Y10S

Abstract:
1. An organic electroluminescent element comprising a substrate having thereon an electrode and at least one organic layer, wherein at least one of the organic layers is a light-emitting layer containing a phosphorescent compound and a host compound, wherein the host compound is represented by Formula (1): wherein R wherein R 1 represents a substituent; Z represents a group of non-metal elements necessary to form a five- to seven-membered ring; n1 is an integer of 0 to 5; B 1 -B 5 each represent a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom and at least one of them represents a nitrogen atom; M 1 is an metal of 8-10 group in the periodic table; X 1 and X 2 each represent a carbon atom, a nitrogen atom or an oxygen atom; L 1 is a group of elements forming ligands having coordination number 2 with X 1 and X 2 ; m1 is an integer of 1 to 3; m2 is an integer of 0 to 2; and m1+m2 is 2 or 3 and has a HOMO of from −5.15 to −3.50 eV and a LUMO of from −1.25 to +1.00 eV, and the host compound has a 0-0 band of 460 nm or less in a phosphorescence spectrum and the host compound has a glass transition temperature of 90° C. or more.