Provided is an organic electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a first organic layer, the first organic layer contains a first organic material and a second organic material that satisfy particular energy level requirements, and the first organic layer has a conductivity greater than or equal to 3×10.sup.−5 S/m. The novel organic electroluminescent device effectively controls a hole injection ability so that the overall performance of the device is effectively improved. Further provided are an organic electroluminescent device and a first organic electroluminescent device.

A quantum dot light-emitting apparatus includes a substrate, with a first electrode layer located on the substrate. An emissive layer having a first set of quantum dots is electrically coupled with the first electrode layer, and a second electrode layer is also electrically coupled with the emissive layer. The second electrode layer is located opposite the first electrode layer, relative to the emissive layer. A first charge transport layer is placed between the emissive layer and the first electrode layer, and a second charge transport layer is placed between the emissive layer and the second electrode layer. At least one of the first charge transport layer and the second charge transport layer includes a second set of quantum dots.

A device comprising an organic light-emitting diode comprising an organic layer sequence, a radiation exit area and an encapsulation, wherein the organic layer sequence comprises at least one radiation-emitting region which generates electromagnetic radiation in the spectral range from infrared radiation to UV radiation during operation, and wherein the encapsulation forms a seal of the organic layer sequence against environmental influences, at least one touch-sensitive operating element, wherein the at least one touch-sensitive operating element comprises at least one touch sensor, wherein the device is flexible.

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.

A condensed cyclic compound and an organic light-emitting device, the compound being represented by Formula 1: ##STR00001##

Semiconductor devices comprising: a semiconductor device comprising: a first electrode comprising conductive material, wherein the conductive material is deposited by ink deposition (for example, layered material inks such as graphene and/or graphite), or wherein the conductive material comprises CVD grown graphene or carbon nanotubes; a first charge transportation layer, wherein the first charge transportation layer is doped with the conductive material of the first electrode; an optional insulation layer; a perovskite active layer; a second charge transportation layer; and a second electrode.

Provided is a compound of Chemical Formula 1: ##STR00001## where R.sub.1 and R.sub.2 are each independently hydrogen, a substituted or unsubstituted C.sub.1-60 alkyl, a substituted or unsubstituted C.sub.1-60 alkoxy, a substituted or unsubstituted C.sub.1-60 haloalkyl, a substituted or unsubstituted C.sub.1-60 haloalkoxy, halogen, cyano, tri(C.sub.1-60 alkyl)silyl, a substituted or unsubstituted C.sub.6-60 aryl, or a substituted or unsubstituted C.sub.2-60 heteroaryl containing at least one of O, N, Si and S, R.sub.3 and R.sub.4 are each independently hydrogen, deuterium, a substituted or unsubstituted C.sub.1-60 alkyl, a substituted or unsubstituted C.sub.1-60 alkoxy, a substituted or unsubstituted C.sub.1-60 haloalkyl, a substituted or unsubstituted C.sub.1-60 haloalkoxy, halogen, cyano, tri(C.sub.1-60 alkyl)silyl, or a substituted or unsubstituted C.sub.2-60 heteroaryl containing at least one of O, N, Si and S, and Ar is C.sub.6-60 aryl, or C.sub.2-60 heteroaryl containing at least one of O, N, Si and S, wherein the C.sub.6-60 aryl, or C.sub.2-60 heteroaryl is substituted with 1 to 5 substituents each selected from the group consisting of a substituted or unsubstituted C.sub.1-60 alkyl, a substituted or unsubstituted C.sub.1-60 alkoxy, a substituted or unsubstituted C.sub.1-60 haloalkyl, a substituted or unsubstituted C.sub.1-60 haloalkoxy, halogen, cyano, and tri(C.sub.1-60 alkyl)silyl, and an organic light emitting device including the same.

A fullerene derivative has a structure of formula (1) or formula (2): wherein Ar is a substituted or unsubstituted aromatic ring, * is a carbon atom at the point of attachment to a fullerene core, X is O, S, Se, or Te, and R is an organic group.

##STR00001##

A novel light-emitting device that is highly convenient, useful, or reliable is provided. The light-emitting device includes a first electrode, a second electrode, a unit, and a first layer. The second electrode includes a region overlapping with the first electrode. The unit includes a region positioned between the first electrode and the second electrode. The unit includes a second layer and a third layer. The second layer includes a region where the third layer is positioned between the second layer and the first electrode. The second layer contains a light-emitting material. The first layer includes a region positioned between the third layer and the first electrode. The first layer contains a material having an acceptor property and a first material. The first layer includes a first region and a second region. The first region includes a region positioned between the second region and the first electrode. The first region contains the material having an acceptor property at a first concentration. The second region contains the material having an acceptor property at a second concentration. Note that the second concentration is higher than zero and lower than the first concentration.

An electroluminescent device and a display device including the same. The electroluminescent device includes a first electrode and a second electrode facing each other; a light emitting layer disposed between the first electrode and the second electrode, the light emitting layer including a quantum dot; a hole transport layer disposed between the light emitting layer and the first electrode; and an electron transport layer disposed between the light emitting layer and the second electrode, wherein the hole transport layer, the light emitting layer, or a combination thereof includes thermally activated delayed fluorescence material, and the thermally activated delayed fluorescence material is present in an amount of greater than or equal to about 0.01 wt % and less than about 10 weight percent (wt %), based on 100 wt % of the hole transport layer, the light emitting layer, or the combination thereof including the thermally activated delayed fluorescence material.