ELECTROLUMINESCENT DEVICES WITH IMPROVED OPTICAL OUT-COUPLING EFFICIENCIES

摘要

An electroluminescent (EL) device is disclosed, comprising a first electrode, a second electrode, one or more functional layers, and a conducting layer. The first electrode is transparent and with a high refractive index nH more than 1.75. The one or more functional layers include a light emitting layer. The conducting layer has a low refractive index nL less than 1.65, being disposed between the first electrode and the one or more functional layers. By judicious combination of the first electrode and conducting layer to induce appropriate microcavity effects, increased coupling efficiencies of EL device could be then obtained.

主权项

1. An electroluminescent (EL) device comprising:
a first electrode, which is transparent and with a high refractive index nH more than 1.75; one or more functional layers including a light emitting layer, wherein a main wavelength of a light emitted from the light emitting layer is defined as λ; a conducting layer, with a low refractive index nL less than 1.65, wherein the conducting layer is disposed between the first electrode and the one or more functional layers; and a second electrode; wherein the first electrode has an outer surface and an inner surface, the inner surface is facing the light emitting layer, and the outer surface is opposite to the inner surface.