Patent ID: 7709833

Claim:
An organic light-emitting device comprising: a substrate; and a plurality of organic light-emitting elements provided on the substrate, the plurality of organic light-emitting elements including a first organic light-emitting element that emits light having a first luminescent color and a second organic light-emitting element that emits light having a second luminescent color different from the first luminescent color, wherein the first luminescent color has a wavelength shorter than a wavelength of the second luminescent color, an order of interference of the first luminescent color is the same as an order of interference of the second luminescent color, the first and second organic light-emitting elements each comprise a sputtered cathode, an anode, an organic light-emitting layer formed between the sputtered cathode and the anode, and an electron injection layer formed between the sputtered cathode and the light-emitting layer, and the electron injection layer comprises an organic compound and an electron injection dopant material; and wherein a thickness of the electron injection layer in the first organic light-emitting element is thinner than a thickness of the electron injection layer in the second organic light-emitting element, and a concentration of the electron injection dopant material in the first organic light-emitting element is higher than a concentration of the electron injection dopant material in the second organic light-emitting element.