Patent ID: 8723171

Claim:
An organic electroluminescence device, comprising opposite anode and cathode, and a hole-transporting region, an emitting layer and an electron-transporting region in sequential order from the anode between the anode and the cathode, 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; the triplet energy E T fbd of the fluorescent dopant FBD is larger than the 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 of formula (20); and the material constituting the common electron-transporting layer has a triplet energy E T el larger than E T bh ; HAr-L 1 -Ar 1 -Ar 2 (20) wherein HAr is a substituted or unsubstituted nitrogen-containing heterocycle having 3 to 40 carbon atoms; L 1 is a single bond, a substituted or unsubstituted arylene group having 6 to 40 carbon atoms or a substituted or unsubstituted heteroarylene group having 3 to 40 carbon atoms; Ar 1 is a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 40 carbon atoms; and Ar 2 is a substituted or unsubstituted aryl group having 6 to 40 carbon atoms or a substituted or unsubstituted heteroaryl group having 3 to 40 carbon atoms.