| abstract |
An organic electroluminescence device (1) includes an anode (10), an emitting layer (20), a blocking layer (30), an electron injecting layer (40), and a cathode (50) in sequential order. The emitting layer (20) includes a host and dopant. The blocking layer (30) includes an aromatic heterocyclic derivative. A triplet energy E T n b (eV) of the blocking layer (30) is larger than a triplet energy E T n h (eV) of the host. An affinity A b (eV) of the blocking layer (30) and an affinity A e (eV) of the electron injecting layer satisfy a relationship of A e -A b <0.2. |