Cambridge Display Technology Limited

Faisal Qureshi

Euan Christopher Smith

Jan Jongman

An organic electroluminescent device comprising: a transparent substrate; a first electrode disposed over the substrate for injecting charge of a first polarity; a second electrode disposed over the first electrode for injecting charge of a second polarity opposite to said first polarity; an organic light-emitting layer disposed between the first and the second electrode, wherein the second electrode is reflective, the first electrode is transparent or semi-transparent, and one or more intermediate layers of dielectric material with a refractive index greater than 1.8 or a metal material is disposed between the substrate and the first electrode forming a semi-transparent mirror whereby a microcavity is provided between the reflective second electrode and the semi-transparent mirror, all the intermediate layers disposed between the substrate and the first electrode having a surface nearest the organic light-emitting layer not more than 150 nm from a surface of the first electrode nearest the organic light-emitting layer.

Organic electroluminescent device

This disclosure generally relates to improved structures for organic light emitting diodes (OLEDs), and more particularly to so-called top emitting OLEDs.

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Cheshire, United Kingdom

Faisal Qureshi