Patent ID: 9577221
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A device comprising: a first electrode; a second electrode; and a hybrid emissive stack disposed between the first electrode and the second electrode, the stack comprising at least three emissive units and at least two charge generation layers, wherein a first emissive unit of the at least three emissive units is disposed over the first electrode; a first charge generation layer of the at least two charge generation layers is disposed over the first emissive unit; a second emissive unit of the at least three emissive units is disposed over the first charge generation layer; a second charge generation layer of the at least two charge generation layers is disposed over the second emissive unit; a third emissive unit of the at least three emissive units is disposed over the second charge generation layer; and wherein the first emissive unit is a phosphorescent organic emissive unit, and the second emissive unit and the third emissive units are only blue fluorescent organic emissive units, and wherein the first emissive unit is the only emissive unit that is disposed between the first electrode and the first charge generation layer, and the first emissive unit contains no fluorescent organic emissive units.