Patent ID: 8735873

Claim:
An organic light emitting diode, comprising: a first electrode; a first hole transporting layer on the first electrode; a first emitting material layer on the first hole transporting layer, the first emitting material layer comprising a first host with a first dopant, wherein an energy level of a lowest unoccupied molecular orbital of the first dopant is higher than an energy level of a lowest unoccupied molecular orbital of the first host; a first electron transporting layer on the first emitting material layer; and a second electrode on the first electron transporting layer, wherein an energy level of each of the first hole transporting layer and the first electron transporting layer is higher than an energy level of a triplet state exciton of the first emitting material layer, wherein the first emitting material layer includes a first side portion adjacent to the first electron transporting layer and a second side portion adjacent to the hole transporting layer, and wherein an amount of the first dopant in the first side portion is greater than an amount of the first dopant in the second side portion.