| abstract |
An organic electroluminescence device ( 1 ) includes: an anode ( 3 ); a cathode ( 4 ); and an emitting layer ( 5 ) provided between the anode ( 3 ) and the cathode ( 4 ). The emitting layer contains a first host, a second host and a phosphorescent dopant. A triplet energy of each of the first host and the second host is 2.8 eV or more. An ionization potential of the first host is 5.5 eV or less. An affinity Af 1 of the first host is smaller than an affinity Af 2 of the second host. |