Patent ID: 8766534

Claim:
An organic electroluminescence element comprising: an anode; a first emitting layer comprising at least a first host material and a first dopant; a second emitting layer comprising at least a second host material and a second dopant; and a cathode in the order mentioned, wherein the energy gap E gh 1 of the first host material, the energy gap E gd 1 of the first dopant, the energy gap E gh 2 of the second host material, and the energy gap E gd 2 of the second dopant satisfy the following formulas: E gh 1>E gd 1 E gh 2>E gd 2 E gd 1>E gd 2>2.7 eV, wherein the first host material is the same as the second host material, wherein both the first emitting layer and the second emitting layer can emit light.