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US 5,834,893 AGranted
High efficiency organic light emitting devices with light directing structures
AssigneeThe Trustees of Princeton University
InventorsVladimir Bulovic, Stephen R. Forrest, Paul Burrows, Dmitri Z. Garbuzov
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Abstract
An organic light emitting device (OLED) structure having reflective surfaces is fabricated in a pit formed in a substrate. The pit has slanted reflective side walls which redirect light that is waveguided in the organic layers of the OLED to a direction substantially normal to the plane of the substrate. The reflective structure can also be formed with a planar configuration over interconnects covered with a polyimide.
Claims31
An organic light emitting device, comprising:
- a substrate with a pit having a slanted side wall formed into the top surface of the substrate,
- a reflective first electrode formed on the top surface of the substrate,
- a first organic layer formed on the first electrode,
- a second organic layer formed on the first organic layer;
- and
- a second electrode formed on the second organic layer,
- wherein at least one of the first and second organic layers emits light upon application of a voltage between the first and second electrodes and wherein the reflective first electrode on the slanted side wall causes light to be redirected in a direction substantially perpendicular to the substrate.
4 more elements
An organic light emitting device, comprising:
- a substrate;
- a first electrode formed on a top surface of the substrate;
- a first organic layer formed on the first electrode;
- a second organic layer formed on the first organic layer;
- and
- a second electrode formed on the second organic layer,
- wherein the top surface of the substrate is substantially planar and the first electrode is formed between two interconnects covered with a polyimide material, the first electrode having a flat bottom surface and two side walls, each side wall forming an angle of approximately 135.degree. with the bottom surface of the first electrode and wherein at least one of the first and second organic layers emits light upon application of a voltage between the first and second electrodes.
4 more elements
An organic light emitting device, comprising:
- a substrate with a pit having a slanted side wall formed into the top surface of the substrate,
- a reflective metallic layer formed on the top surface of the substrate,
- a first electrode formed on the reflective metallic layer,
- a first organic layer formed on the first electrode,
- a second organic layer formed on the first organic layer,
- a second electrode formed on the second organic layer,
- wherein at least one of the first and second organic layers emits light upon application of a voltage between the first and second electrodes and wherein the reflective metallic layer on the slanted side wall causes light to be redirected in a direction substantially perpendicular to the substrate.
4 more elements
Dependencies are inferred from the claim text.