Patent ID: 8304764
Filing Date: 2012-11-06
Classification: C09K,H01L,H05B,Y02B

Abstract:
1. An organic electroluminescent element comprising a substrate and, provided on the substrate, at least an anode, a cathode, and a light emitting layer held between the anode and the cathode, and emitting white light, wherein the light emitting layer contains at least three types of light emitting materials different from each other in λ max, and an absolute value of HOMO level of the light emitting material having a shortest wavelength is smaller than an absolute value of HOMO level of other light emitting materials, and wherein the light emitting material having the shortest wavelength is a phosphorescent compound represented by Formula (1) wherein R 1 represents a substituent; Z represents a group of non-metallic atoms which are necessary to form a 5 to 7 member ring; n1 represents an integer of 0 to 5; B 1 through B 5 each represents a carbon atom, a nitrogen atom, an oxygen atom, or a sulfur atom, while at least one of B 1 through B 5 represents a nitrogen atom; M 1 represents a metal in Groups 8 to 10 of the element periodic table; each of X 1 and X 2 represents a carbon atom, a nitrogen atom, or an oxygen atom; L 1 represents a group of atoms which form a bidentate ligand together with X 1 and X 2 ; m1 represents an integer of 1, 2, or 3; and m2 represents an integer of 0, 1, or 2, while m1+m2 is 2 or 3.