Patent ID: 9224960
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A light-emitting device comprising: a first electrode; a first layer over the first electrode, the first layer comprising a first compound selected from a metal oxide, a porphyrin-based compound, an amine compound, a carbazole derivative, and an aromatic hydrocarbon; a first light-emitting layer over and in contact with the first layer, the first light-emitting layer substantially consisting of a first substance; a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a second substance and being doped with the first substance; a second layer over the second light-emitting layer, the second layer comprising a second compound; and a second electrode over the second layer, wherein the second compound is selected from a metal complex, an oxadiazole derivative, and a phenanthroline derivative, wherein the second substance has an energy gap larger than the first substance, and wherein the porphyrin-based compound is a phthalocyanine derivative.