Embodiments of the present disclosure provide for single crystal organometallic halide perovskites, methods of making, methods of use, devices incorporating single crystal organometallic halide perovskites, and the like.

A problem to be solved of the invention is to provide a package of a liquid composition for an organic electroluminescent device including a phosphorescent material and a solvent with extended storage lifetime, which may be produced with high working efficiency. A solving means of the problem is a package of a liquid composition for an organic electroluminescent device having a liquid composition for an organic electroluminescent device including a phosphorescent material and a solvent, and a container that contains the liquid composition for an organic electroluminescent device, wherein the package of a liquid composition for an organic electroluminescent device has a transmittance of light, that is a wavelength component of from 500 nm to 780 nm, from outside of the package to inside of the container of 15% or less.

An ink composition containing a P-type semiconductor material, an N-type semiconductor material and two or more solvents including a first solvent and a second solvent, wherein the total amount of the first solvent and the second solvent is 70% by weight or more with respect to 100% by weight of all the solvents contained in the ink composition; the boiling point of the first solvent is lower than the boiling point of the second solvent; the boiling point of the first solvent is 120° C. or more and 400° C. or less; and the hydrogen bond Hansen solubility parameter H1 (MPa.sup.0.5) of the first solvent and the hydrogen bond Hansen solubility parameter H2 (MPa.sup.0.5) of the second solvent are in the relation of 0.5≦(H2−H1)≦5.0.

A perovskite light-emitting diode and a method of manufacturing the same are provided. The method includes steps of providing a substrate, disposing a first electrode layer, a hole transport layer, and a perovskite precursor liquid layer on the substrate, coating the perovskite precursor liquid layer with a first solvent, performing a first thermal process to form a perovskite prefabricated layer, coating the perovskite prefabricated layer with a second solvent, and performing a second thermal process to form a perovskite light-emitting layer.

An organic light emitting diode display device and a method of manufacturing thereof are provided. An electron transport layer ink droplet is formed on a surface of the first solvent ink droplet by forming a first solvent ink droplet on a surface of the organic light emitting layer. Thus, the first solvent constituting the first solvent ink droplet and the second solvent of the electron transport layer ink droplet are evaporated to form the electron transport layer.

A light-emitting element includes an anode, a hole transport layer, a quantum dot light-emitting layer, an electron transport layer, and a cathode, in this order. The electron transport layer includes a particulate metal oxide and a conductive resin that disperses the metal oxide.

Provided is a process for preparing a composition comprising semiconducting single-walled carbon nanotubes, a semiconducting polymer and solvent A (composition A), which process comprises the step of separating composition A from a composition comprising semiconducting and metallic single-walled carbon nanotubes, the semiconducting polymer and solvent B (composition B), wherein the semiconducting polymer has a band gap in the range of 0.5 to 1.8 eV and solvent A and B comprise an aromatic or a heteroaromatic solvent, composition A itself, a process for forming an electronic device, which process comprises the step of forming a layer by applying composition A to a precursor of the electronic device, as well as the electronic device obtainable by this process.

The present invention relates to a process for producing a layer of a crystalline material, which process comprises disposing on a substrate: a first precursor compound comprising a first cation and a sacrificial anion, which first cation is a metal or metalloid cation and which sacrificial anion comprises two or more atoms; and a second precursor compound comprising a second anion and a second cation, which second cation can together with the sacrificial anion form a first volatile compound. The invention also relates to a layer of a crystalline material obtainable by a process according to the invention. The invention also provides a process for producing a semiconductor device comprising a process for producing a layer of a crystalline material according to the invention. The invention also provides a composition comprising: (a) a solvent; (b) NH.sub.4X; (c) AX; and (d) BY.sub.2 or MY.sub.4; wherein X, A, M and Y are as defined herein.

A light emitting element ink comprises a light emitting element solvent, a light emitting element dispersed in the light emitting element solvent, the light emitting element including a plurality of semiconductor layers, and an insulating film surrounding outer surfaces of the plurality of semiconductor layers, and a thickener dispersed in the light emitting element solvent, wherein the thickener includes a compound represented by Chemical Structural Formula 1 as a polyol-based compound capable of forming a hydrogen bond with the light emitting element solvent or another thickener, and the thickener has a boiling point in a range of about 200° C. to about 450° C.

The present application relates to an ink formulation, and preparation methods of functional layer of optoelectronic devices. The ink formulation includes a component A and a component B, the component A including a first liquid, the component B including a second liquid and a functional material dispersed in the second liquid, the first liquid having a boiling point at least 10° C. higher than a boiling point of the second liquid; the first liquid and the second liquid are immiscible and the solubility of the functional material in the second liquid is ≥1 g, the solubility of the functional material in the first liquid is ≤0.05 g, the density of the first liquid is greater than the density of the second liquid, and the ratio of the surface tension of the first liquid to the surface tension of the second liquid ranges from 0.8 to 1.2.