Birch, Stewart, Kolasch & Birch, LLP
Organic electroluminescent device with improved lifetime
The present invention relates to an organic electroluminescent device comprising a gradual organic electroluminescent layer AxByCz inserted between an anode electrode (may include a hole injection layer) and a cathode electrode, wherein A, B, and C are mediums capable of transporting holes, transporting electrons and injecting electrons respectively, and x, y, and z denote the content of medium A, B, and C respectively. The gradual layer with different materials combined is a mixed continuous organic medium without heterojunctions, wherein the sum of x, y, and z is 100%. Moreover, x has a maximum, value adjacent to the anode electrode, and the sum of y and z has a maximum value adjacent to the cathode electrode, while the medium C is an electron injection component comprising either a low work function metal, metal compound, metal alloy, or an organic material with high electron affinity.
Windell Corporation
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Wen-Chun
Wang