Patent ID: 7728518
Filing Date: 2010-06-01
Classification: H01L

Abstract:
1. A light emitting device comprising: a substrate; an anode formed over the substrate; a hole injection layer formed over the anode; a first hole transporting layer formed over the hole injection layer, the first hole transporting layer containing a first hole transporting material and a first doping material; a second hole transporting layer formed over the first hole transporting layer, the second hole transporting layer consisting of the first hole transporting material; a mixed layer formed over the second hole transporting layer, the mixed layer containing an electron transporting material and a second doping material; an electron transporting layer formed over the mixed layer, the electron transporting layer consisting of the electron transporting material; and a cathode formed over the electron transporting layer, wherein the second doping material is a triplet light-emitting material.