Patent ID: 9070884
Filing Date: 2015-06-30
Classification: C09K,H01L,H05B

Abstract:
1. An organic light emitting device comprising: a cathode; a first emissive layer comprising a fluorescent blue emitting material as a dopant in a host material; a spacer layer; a second emissive layer comprising a phosphorescent emitting material as a dopant in a host material; and an anode; wherein, the spacer layer is between the first emissive layer and the second emissive layer, the spacer layer inhibits quenching of the triplet excitons in the second emissive layer; an interface between the spacer layer and the first emissive layer forms a heterojunction; and the spacer layer comprises a material that has a triplet energy that is higher than the triplet energy of the phosphorescent emitting material; and wherein a combined emission of the emitting materials gives a white emission from the device.