| abstract |
An organic electroluminescence device that includes an anode, an emitting layer that includes a host and a dopant, a blocking layer, an electron injecting layer, and a cathode where the blocking layer includes an aromatic heterocyclic derivative, the triplet energy E T b (eV) of the blocking layer is larger than a triplet energy E T h (eV) of the host, and the affinity A b (eV) of the blocking layer and an affinity A e (eV) of the electron injecting layer satisfy a relationship of A e −−A b <0.2. |