Hidden organic optoelectronic devices with a light scattering layer
AssigneeKoninklijke Philips N.V.
InventorsCristina Tanase, Herbert Lifka, Mihaela Ioana Popovici, Horst Greiner
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Abstract
Disclosed is an optoelectronic device including at least one optoelectronic active region comprising at least a rear electrode and a front electrode between which an organic optoelectronic material is sandwiched, said rear electrode being reflective, and a cover layer arranged in front of said front electrode. The cover layer is formed from a material with light-scattering particles of a first material dispersed in a transparent matrix of at an least partly hydrolyzed silica sol. Due to the highly scattering properties of the cover layer, the device is essentially concealed behind the cover layer when not in its operative state.
Claims11
An optoelectronic device, comprising
- a first and a second optoelectronic active region arranged side by side and mutually spaced apart so as to form a interstitial region therebetween, said first and second optoelectronic active region comprising
- a reflective rear electrode,
- a front electrode, and
- an organic optoelectronic material disposed therebetween, and
- a cover layer superimposed on said first and second optoelectronic active regions facing said front electrode and covering at least the combined surface of said first and second optoelectronic active regions and said interstitial region, said cover layer comprising a plurality of light-scattering particles of a first material dispersed in a transparent matrix comprising at least partly hydrolyzed silica sol, wherein the refractive index of said particles of said first material is higher than the refractive index of the transparent matrix.
Dependencies are inferred from the claim text.