Patent ID: 8207526

Claim:
An organic electroluminescence device, comprising: an anode for injecting holes; a phosphorescent-emitting layer; a charge blocking layer; a fluorescent-emitting layer; and a cathode for injecting electrons, in this order, the phosphorescent-emitting layer containing a phosphorescent host and a phosphorescent dopant for providing phosphorescence, the fluorescent-emitting layer containing a fluorescent host and a fluorescent dopant for providing fluorescence, the charge blocking layer blocking the electrons injected into the fluorescent-emitting layer from being injected toward the charge blocking layer from the fluorescent-emitting layer, the charge blocking layer also injecting the holes into the fluorescent-emitting layer from the phosphorescent-emitting layer, a triplet energy gap Eg PD of the phosphorescent dopant, a triplet energy gap Eg EB of the charge blocking layer and a triplet energy gap Eg FH of the fluorescent host satisfying a formula (1) as follows, Eg PD <Eg EB <Eg FH (1).