US 11,588,139 B2 · Circularly polarized light emitting organic light emitting diodes

Abstract

Disclosed herein are light emitting device that emit highly circularly polarized light. These devices may be used to form a dot-matrix display or an electronic information display comprised of a series of photopolymerizable, chiral liquid crystalline layers that can be solvent cast on a substrate. The mixture of chiral materials in each successive layer may be blended in such a way that each layer has the same chiral pitch and may also be blended so that the ordinary and extraordinary refractive indices in each layer match the other layers such that the complete assembly of layers will optically function as a single relatively thick layer of chiral liquid crystal. The chiral nematic material in each layer can spontaneously adopt a helical structure with a helical pitch. Further disclosed are pixel structures that not only emit light with brightness and chromaticity information, but also depth of focus information as well.

Claims21

Dependent claims

A dot-matrix display comprising a light emitting device, the light emitting device comprising:

a vertically emitting light emitting diode comprising:
a first hole transporting layer comprising a polymerized chiral nematic liquid crystal material that is doped with a p-dopant;
a second hole transporting layer comprising a polymerized chiral nematic liquid crystal material;
a light emitting layer comprising a polymerized chiral nematic liquid crystalline material and further comprising an electroluminescent material;
a first electron transporting layer comprising a polymerized chiral nematic liquid crystalline material;
and
a second electron transporting layer comprising a polymerized liquid crystalline material that is doped with an n-dopant;
wherein the chiral nematic liquid crystalline material of said first hole transporting layer, said second hole transporting layer, and said light emitting layer combine to create an optical stop band;
and
wherein said electroluminescent material emits light at wavelengths in said stop band;
and
an electrically switchable, diffractive, liquid crystal cylindrical lens.

9 more elements

Dependencies are inferred from the claim text.

Circularly polarized light emitting organic light emitting diodes

Life of this patent

Circularly polarized light emitting organic light emitting diodes

Life of this patent

Abstract

Claims21