Patent ID: 7812521

Claim:
A white light-emitting organic EL device, comprising: an anode; a cathode; at least a red light-emitting layer, a blue light-emitting layer, and a green light-emitting layer provided between the anode and the cathode; and an intermediate layer formed of one of a hole-transporting material, an electron-transporting material, a hole-blocking material, and an electron-blocking material and provided between any two adjacent layers of the respective light-emitting layers, wherein, when CIE chromaticity coordinates of a material incorporated into the red light-emitting layer responsible for emission of red light are represented by (x R , y R ), CIE chromaticity coordinates of a material incorporated into the blue light-emitting layer responsible for emission of blue light are represented by (x B , y B ), CIE chromaticity coordinates of a material incorporated into the green light-emitting layer responsible for emission of green light are represented by (x G , y G ), and target CIE chromaticity coordinates of white light emitted from the device are represented by (x t , y t ), Δy represented as a difference between y R and y B , and Δx represented as a difference between x G and x t satisfy the following relationships: Δy≦0.18 Δx≦0.10.