Patent ID: 8643268

Claim:
An organic electroluminescence device comprising a pair of electrodes and an organic compound layer between the pair of electrodes, the organic compound layer comprising an emitting layer comprising a first material and a second material, wherein the second material is a fluorescent material, singlet energy EgS(H) of the first material and singlet energy EgS(D) of the second material satisfy a relationship of a formula (1) below, and the first material satisfies a relationship of a formula (2) below in terms of a difference ΔST(H) between the singlet energy EgS(H) and an energy gap Eg 77K (H) at 77K EgS ( H )> EgS ( D ) (1) Δ ST ( H )= EgS ( H )− Eg 77K ( H )<0.3 (eV). (2)