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AssigneesSeiko Epson Corporation, Cambridge University Technical Services Limited of the Old Schools
InventorTakeo Kawase
Estimating the term…
A light emitting device comprising a substrate, a transparent electrode formed on said substrate, a layer of light emitting material provided over the transparent electrode and having at least one corrugated surface, and a further electrode formed over the light emitting material. In a preferred arrangement there is provided a light emitting device comprising a substrate having a corrugated surface, a transparent electrode formed on said corrugated surface, a layer of light emitting material provided over the transparent electrode and a farther electrode formed over the light emitting material. In another preferred arrangement there is provided a light emitting device comprising a substrate, a transparent electrode formed over the substrate, a conductive polymer layer formed over the transparent electrode and having a corrugated surface opposite to a surface facing the transparent electrode, a light emitting material in contact with said corrugated surface and a further electrode formed over the light emitting material. The invention also provides a method of manufacturing a light emitting device comprising the steps of providing a substrate, forming a transparent electrode on said substrate, providing a layer of light emitting material over the transparent electrode, arranging for the light emitting surface to have at least one corrugated surface, and forming a further electrode over the light emitting material. Very preferably the light emitting material is an organic material.
A light emitting device comprising a substrate, a transparent electrode formed on said substrate, a layer of light emitting material provided over the apparent electrode and having at least one corrugated surface, and a fisher electrode formed over the light emitting material.
A light emitting device as claimed in any preceding claim, wherein the light emitting material has an absorption coefficient of less than 1000 cm−1.
A light emitting device as claimed in any preceding claim, wherein the light emitting material comprises a conjugated polymer.
A light emitting device as claimed in any preceding claim, wherein the corrugated surface has a pitch A according to an equation.
A light emitting device as claimed in any preceding claim, wherein the pitch of the corrugated surface is in the range 300 to 450 nm.
A light emitting device as claimed in any preceding claim, wherein the corrugated surface has a one-dimensional periodic structure.
A light emitting device as claimed in any preceding claim, wherein the layer of light emitting material has a plurality of regions each of which has a corrugated surface with a respectively different pitch.
A method of manufacturing a light emitting device comprising the steps of providing a substrate, forming a transparent electrode on said substrate, providing a layer of light emitting material over the transparent electrode, arranging for the light emitting surface to have at least one corrugated surface, and forming a further electrode over the light emitting material.
Dependencies are inferred from the claim text.