Patent ID: 8518558

Claim:
An organic electroluminescent element comprising a substrate, an anode, a cathode, and three light-emitting layers being sandwiched between the anode and the cathode, the light-emitting layers being operable for emitting white light, wherein the three light-emitting layers in their entirety consist of four kinds of light-emitting materials and optionally at least one host material, said four kinds of light-emitting materials are as follows: a blue light-emitting material having an emission maximum wavelength (λ max) of 430 to 480 nm, a green light-emitting material having an emission maximum wavelength (λ max) of 510 to 560 nm, a yellow-red light-emitting material having an emission maximum wavelength (λ max) of 570 to 610 nm, and a red light-emitting material having an emission maximum wavelength (λ max) of 610 to 650 nm, wherein the green light-emitting material, the yellow-red light-emitting material and the red light-emitting material each is a phosphorescent light-emitting material, and the blue light-emitting material is a phosphorescent light-emitting compound represented by the following Formula (1): wherein R 1 represents a substituent; Z represents a non-metal atom group necessary to form a 5- to 7-membered ring; n1 represents an integer of 0 to 5; each of B 1 to B 5 independently represents a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom, wherein at least one of B 1 to B 5 represents a nitrogen atom; M 1 represents a metal of Groups 8 to 10 of the Periodic Table of the Elements; each of X 1 and X 2 independently represents a carbon atom, a nitrogen atom, or an oxygen atom; L 1 , together with X 1 and X 2 , represents a group of atoms to form a bidentate ligand; m1 is an integer of 1 to 3, and m2 is an integer of 0 to 2, wherein the sum of m1 and m2 is 2 or 3, and the green light-emitting material and the red light-emitting material are simultaneously incorporated in a light-emitting layer located on the anode side of a blue light-emitting layer; and the green light-emitting material and the yellow-red light-emitting material are simultaneously incorporated in a light-emitting layer located on the cathode side of the blue light-emitting layer.