| abstract |
The light-emitting device of the present invention includes a cathode, an anode, and a light-emitting portion, and the light-emitting portion includes a first light-emitting layer, an intermediate layer, a second light-emitting layer, and a third light-emitting layer which are laminated from the anode side to the cathode side, and the second and the second light-emitting portions Each of the three light-emitting layers includes a light-emitting material, a host material, and an auxiliary dopant material, and the intermediate layer includes a host material and an auxiliary dopant material, and the second light-emitting layer and the third light-emitting layer are When the concentration of the auxiliary dopant material contained in the intermediate layer is CAssist (EML2), CAssist (EML3), and CAssist (IML), respectively, the relationship (A) is satisfied.nCAssist(IML)>CAssist(EML2)≧CAssist(EML3) (A) |