Electroluminescent device and a method of making same
AssigneeRCA Corporation
InventorsJames Kane, Mildred Ling
Life of this patent
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Abstract
An electroluminescent device includes a tin oxide electrode having a textured surface with a phosphor layer interposed between dielectric layers overlying the textured surface. The textured surface propagates through the overlying layers so as to reduce the amount of generated light trapped in the device structure and increase the output brightness of the device.
Claims16
In an electroluminescent device comprising a first electrode, a first dielectric layer overlying the first electrode, a continuous phosphor layer overlying the first dielectric layer, a second dielectric layer overlying the phosphor layer and a second electrode overlying the second dielectric layer, the improvement comprising:
- said first electrode comprising tin oxide having a textured surface adjacent the first dielectric layer and an opposed surface which is smooth and said phosphor layer conformally overlying said textured surface.
In an electroluminescent device comprising a substrate having a smooth, specularly reflecting surface with a first electrode overlying said substrate surface and a continuous phosphor layer overlying said first electrode;
- the improvement comprising:
- said first electrode comprising tin oxide having a surface opposed to the surface thereof adjacent to said substrate surface which is extended and said phosphor layer conformally overlying said textured surface.
In a method of forming an electroluminescent device comprising the steps of forming a first electrode on a smooth, specularly reflecting surface of a substrate, forming a first dielectric layer overlying said first electrode, forming a phosphor layer overlying said first dielectric layer, forming a second dielectric layer overlying said phosphor layer and forming a second electrode overlying said second dielectic layer;
- the improvement comprising:
- depositing a tin oxide first electrode onto said substrate surface held at a temperature greater than about 350.degree. C. by chemical vapor deposition from an atmosphere containing tin, oxygen, hydrogen and a conductivity modifying dopant whereby the surface of said electrode opposed to said substrate surface has a dominant peak-to-valley texture greater than 100 nanometers;
- and
- wherein said tin oxide first electrode has a textured surface adjacent the first dielectric layer and an opposed surface which is smooth.
Dependencies are inferred from the claim text.