Patent ID: 7635858
Filing Date: 2009-12-22
Classification: H01L

Abstract:
1. An organic light-emitting device comprising: a cathode; an anode; and a layer structure disposed between the cathode and the anode; the layer structure comprising: a hole source region disposed adjacent to the anode; an electron source region disposed adjacent to the cathode; and an emissive region disposed between the hole source region and the electron source region, such that the emissive region is immediately adjacent to the hole source region and immediately adjacent to the electron source region, the emissive region made of at least one organic host material doped with one or more luminescent dopants, each of the hole source region, the electron source region and the emissive region having an electrical conductivity, wherein the electrical conductivity of the hole source region is between 10 the electrical conductivity of the electron source region is between 10 the electrical conductivity of the emissive region is lower than 10 the electrical conductivity of the cathode and the anode is higher than 10