Patent ID: 8461574

Claim:
An organic electroluminescence device, comprising in sequential order: an anode; a hole-transporting region, an emitting layer an electron-transporting region and a cathode in opposition to the anode, wherein the emitting layer comprises a red emitting portion, a green emitting portion, and a blue emitting portion; the blue emitting portion comprises a host BH and a fluorescent dopant FBD; a triplet energy E T fbd of the fluorescent dopant FBD is larger than a triplet energy E T bh of the host BH; the green emitting portion comprises a host GH and a phosphorescent dopant PGD; the electron-transporting region comprises a common electron-transporting layer adjacent to the red emitting portion, the green emitting portion and the blue emitting portion; the common electron-transporting layer comprises a material having a triplet energy E T el larger than the E T bh ; and a difference between an affinity of the host GH and an affinity of the material constituting the common electron-transporting layer is 0.4 eV or less.