Patent ID: 8384070

Claim:
An organic electroluminescence device, comprising: an anode; a cathode; and an organic compound layer interposed between the anode and the cathode, and including at least an emission layer, wherein: the emission layer comprises a first emission layer provided on an anode side and a second emission layer provided on a cathode side; the first emission layer contains a first host and a first dopant; the second emission layer contains a second host and a second dopant; the following relationship (a) is established between the first host and the first dopant; the following relationship (b) is established between the second host and the second dopant; and the following relationship (c) is established between the first host and the second host: |LUMO( H 1 )−LUMO( D 1 )|>|HOMO( H 1 )−HOMO( D 1 )|, (a) |LUMO( H 2 )−LUMO( D 2 )|>|HOMO( H 2 )−HOMO( D 2 )|, and (b) |HOMO( H 1 )|>|HOMO( H 2 )| (c) where: LUMO(H 1 ), LUMO(D 1 ), LUMO(H 2 ), and LUMO(D 2 ) represent LUMOs of the first host, the first dopant, the second host, and the second dopant, respectively; and HOMO(H 1 ), HOMO(D 1 ), HOMO(H 2 ), and HOMO(D 2 ) represent HOMOs of the first host, the first dopant, the second host, and the second dopant, respectively.