Patent ID: 8853715

Claim:
A display apparatus comprising: a first organic electroluminescent element to emit a first color; and a second organic electroluminescent element to emit a second color different from the first color, a third organic electroluminescent element to emit a third color different from the first color and the second color, both first, second and third organic electroluminescent elements being provided with an anode, a cathode, and a light-emitting layer disposed between the anode and the cathode, wherein a first light-emitting layer of the first organic electroluminescent element is disposed in common to the second and the third organic electroluminescent elements, a second light-emitting layer of the second organic electroluminescent element is disposed in contact with the first light-emitting layer and disposed between the cathode and the first light-emitting layer, and the second light-emitting layer contains a host material and a light-emitting dopant material and is configured to satisfy Relational expressions (A) and (B) described below, |LUMO D2 |>|LUMO H2 | (A) |LUMO D2 |−|LUMO H2 |>|HOMO H2 |−|HOMO D2 | (B) where LUMO H2 and HOMO H2 represent the LUMO level energy and the HOMO level energy, respectively, of the host material contained in the second light-emitting layer and LUMO D2 and HOMO D2 represent the LUMO level energy and the HOMO level energy, respectively, of the light-emitting dopant material contained in the second light-emitting layer, a third light-emitting layer of the third organic electroluminescent element is disposed in contact with the first light-emitting layer and disposed between the anode and the first light-emitting layer, and the third light-emitting layer contains a host material and a light-emitting dopant material and is configured to satisfy Relational expressions (E) and (F) described below, |HOMO D3 |<|HOMO H3 | (E) |HOMO H3 |−|HOMO D3 |>|LUMO D3 |−|LUMO H3 | (F) where LUMO H3 and HOMO H3 represent the LUMO level energy and the HOMO level energy, respectively, of the host material contained in the third light-emitting layer and LUMO D3 and HOMO D3 represent the LUMO level energy and the HOMO level energy, respectively, of the light-emitting dopant material contained in the third light-emitting layer.