Patent ID: 8927974
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A display apparatus comprising: a first organic electroluminescent element to emit blue color; and a second organic electroluminescent element to emit a second color different from the first color, the both of the first and second 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 and that of the second organic electroluminescent element are in common, a second light-emitting layer of the second organic electroluminescent element is disposed in contact with the first light-emitting layer and in the side nearer to the cathode than is the first light-emitting layer, and further comprising a third organic electroluminescent element to emit a third color different from the first color and the second color, wherein the first light-emitting layer is disposed in common to the third organic electroluminescent element as well, and a third light-emitting layer of the third organic electroluminescent element is disposed in contact with the first light-emitting layer and in the side nearer to the cathode than is the first light-emitting layer; the first light-emitting layer contains a host material and a light-emitting dopant material and is configured to satisfy Formulae (1) and (2) described below, where LUMO H1 and HOMO H1 represent the LUMO level energy and the HOMO level energy, respectively, of the host material contained in the first light-emitting layer and LUMO D1 and HOMO D1 represent the LUMO level energy and the HOMO level energy, respectively, of the light-emitting dopant material contained in the first light-emitting layer, wherein the second light-emitting layer is configured to have the HOMO level energy HOMO wherein the third light-emitting layer is configured to have the HOMO level energy HOMO