Patent ID: 7474049

Claim:
An organic electroluminescent device, comprising: a substrate; a first electrode and a second electrode opposite to the first electrode disposed over the substrate; a hole transport layer disposed between the first electrode and the second electrode; an electron transport layer disposed between the second electrode and the hole transport layer; at least three emissive layers disposed between the hole transport layer and the electron transport layer, so that two of the at least three emissive layers comprises a group and another of the at least three emissive layers comprises an un-group, one of the layers of the group being a first fluorescent emissive layer and another of the layers of the group being a first phosphorescent emissive layer, wherein the visible light of the first fluorescent emissive layer and the visible light of the first phosphorescent emissive layer are not absorbed by each other, and the visible light spectrums of the first fluorescent emissive layer and the visible light spectrums of the first phosphorescent emissive layer are not affected by each other; and an exciton blocking layer disposed between the group and the un-group.