Patent ID: 8563144

Claim:
An electroluminescent (EL) device, comprising: a stack structure comprising a hole injection layer, a hole transport layer, an emitting layer, an electron-transport layer and an electron injection layer sequentially between a first electrode and a second electrode, wherein the emitting layer has a red-fluorescent emitting layer, a green-phosphorescent emitting layer and a blue-fluorescent emitting layer on the hole transport layer, respectively, wherein the electron-transport layer consists of a mixture of a ratio of 5:5 of Balq having hole-blocking properties and BeBq 2 having electron-transporting properties and the electron-transport layer is a single layer directly on the emitting layer, and wherein the electron injection layer consists of LiF and is a single layer directly on the electron-transport layer and the emitting layer is a single layer on the hole transport layer.