Patent ID: 8618728

Claim:
A light-emitting device comprising: an anode; a cathode; a first light-emitting unit provided between the anode and the cathode, the first light-emitting unit having at least one light-emitting layer that emits light in response to application of a voltage between the anode and the cathode; a second light-emitting unit provided between the cathode and the first light-emitting unit, the second light-emitting unit having at least one light-emitting layer that emits light in response to application of a voltage between the anode and the cathode; and a carrier generation layer provided between the first light-emitting unit and the second light-emitting unit, the carrier generation layer generating holes and electrons in response to application of a voltage between the anode and the cathode, wherein the carrier generation layer includes an n-type electron transport layer and an electron-withdrawing layer, the n-type electron transport layer being positioned between the first light-emitting unit and the electron-withdrawing layer, the electron-withdrawing layer contacting the n-type electron transport layer and containing organic cyanide having an aromatic ring, the organic cyanide being a hexaazatriphenylene derivative, and the n-type electron transport layer is a mixed material of tris (8-quinolinolato) aluminum and lithium oxide, an amount of the lithium oxide in the mixed material decreases from 2.0% of volume ratio at a side of the electron-withdrawing layer to 0.5% volume ratio at an another side.