Patent ID: 6917159

Claim:
A microcavity OLED device having improved luminance efficiency and improved chromaticity of emitted light, comprising: a) a substrate; b) a microcavity having a selected cavity length defined over one substrate surface by, in sequence, a metallic bottom-electrode layer, an organic electroluminescent (EL) medium structure, and a metallic top-electrode layer, wherein one of the metallic electrode layers is light transmissive and the other one is substantially opaque and reflective; wherein the material for the light transmissive electrode layer includes Ag, Au, or alloys thereof, and the material for the opaque and reflective electrode layer includes Ag, Au, Al, or alloys thereof; wherein the organic EL medium structure includes at least a light-emitting layer comprised of at least one organic host material and at least one dopant material dispersed in the at least one host material; wherein the selected cavity length is provided by selection of a thickness of at least one of the organic layers; wherein the at least one dopant material is selected from the class of fluorescent dyes consisting of derivatives of anthracene, tetracene, xanthene, perylene, rubrene, coumarin, rhodamine, and quinacridone, dicyanomethylenepyran compounds, thiopyran compounds, polymethine compounds, pyrilium and thiapyrilium compounds, fluorene derivatives, periflanthene derivatives, indenoperylene derivatives, bis(azinyl)amine boron compounds, bis(azinyl)methane compounds, and carbostyryl compounds, so that one of red, green, or blue light is generated in the light-emitting layer; and wherein the selected cavity length of the microcavity OLED device is tuned to provide a resonance condition for emission of one of red, green, or blue light through the light transmissive electrode layer and having the improved luminance efficiency and the improved chromaticity.