US Patent 8653537 Layer assembly for a light-emitting component

The invention relates to a layer assembly for a light-emitting component, in particular a phosphorescent organic light-emitting diode, having a hole-injecting contact and an electron-injecting contact which are each connected to a light-emitting region, wherein, in the light-emitting region, one light-emitting layer is made up of a material (M1) and another light-emitting layer is made up of another material (M2), where the material (M1) is ambipolar and preferentially transports holes and the other material (M2) is ambipolar and preferentially transports electrons; a heterotransition is formed by the material (M1) and the other material (M2) in the light-emitting region; an interface between the material (M1) and the other material (M2) is of the staggered type II; the material (M1) and the other material (M2) each contain an appropriate addition of one or more triplet emitter dopants; and an energy barrier for transfer of holes from the material (M1) into the other material (M2) and an energy barrier for transfer of electrons from the other material (M2) into the material (M1) are each less than about 0.4 eV.