Patent ID: 7960912

Claim:
A light-emitting device comprising: a cathode; an anode; a red light-emitting layer that is disposed between the cathode and the anode and that emits red light; a blue light-emitting layer that is disposed between the red light-emitting layer and the cathode and that emits blue light; a green light-emitting layer that is disposed between the blue light-emitting layer and the cathode and that emits green light; and an intermediate layer that is disposed between and in contact with the red light-emitting layer and the blue light-emitting layer and that functions to prevent energy transfer of excitons between the red light-emitting layer and the blue light-emitting layer, the intermediate layer including a first intermediate layer disposed in contact with the red light-emitting layer and mainly containing a first intermediate material and a second intermediate layer disposed in contact with the blue light-emitting layer and mainly containing a second intermediate material different from the first intermediate material, and the layers of the light-emitting device are stacked on top of each other such that both the highest occupied molecular orbitals and the lowest unoccupied molecular orbitals of the materials of the layers rise gradually in energy level from the anode side to the cathode side.