Abstract: An organic electroluminescence element including an anode, a light-emitting layer, a functional layer, and a cathode stacked in this order. The light-emitting layer and the functional layer are in contact with each other. Hole mobility of the light-emitting layer is greater than electron mobility of the light-emitting layer. The electron mobility of the light-emitting layer is equal to or greater than an effective electron mobility of the functional layer. A highest occupied molecular orbital (HOMO) level of a first functional material included in the light-emitting layer is at least 0.4 eV greater than a HOMO level of a second functional material included in the functional layer.

Abstract: An organic EL element including an anode, a cathode, and a light emitting layer between the anode and the cathode. The light emitting layer includes a fluorescent material and a host material. A difference between a lowest unoccupied molecular orbital (LUMO) level of the fluorescent material and a highest occupied molecular orbital (HOMO) level of the fluorescent material is less than or equal to a difference between a LUMO level and a HOMO level of the host material. The LUMO level of the fluorescent material is equal to or higher than the LUMO level of the host material. The HOMO level of the fluorescent material is equal to or higher than the HOMO level of the host material, and a difference in energy level between the HOMO level of the fluorescent material and the HOMO level of the host material is 0.3 eV or less.

Abstract: An organic EL element including an anode, a first functional layer including organic material, disposed above the anode, a second functional layer including organic material, disposed on and in contact with the first functional layer, a light emitting layer disposed on and in contact with the second functional layer, and a cathode disposed above the light emitting layer. A highest occupied molecular orbital (HOMO) level of the organic material of the second functional layer has an energy level at least 0.2 eV lower than that of a HOMO level of the organic material of the first functional layer, and film thickness of the second functional layer is 15 nm or less.

Abstract: According to one embodiment, a solution for organic EL contains a mixed solvent of two or more kinds of organic solvents which contain at least a first organic solvent and a second organic solvent, and an organic EL contributing material dissolved into the mixed solvent. The coordinates (HSP coordinates) specified by Hansen solubility parameters of the first organic solvent are Hd in a range of 17.5 to 19.5 (J/cm3)1/2, Hp in a range of 3.5 to 5.5 (J/cm3)1/2 and Hh in a range of 3.5 to 5.5 (J/cm3)1/2. The HSP coordinates of the second organic solvent are Hd in a range of 17.5 to 19.5 (J/cm3)1/2, Hp in a range of 0 to 2.0 (J/cm3)1/2, and Hh in a range of 0.5 to 2.5 (J/cm3)1/2.

Abstract: An organic electroluminescence element including an anode, a light-emitting layer, a functional layer, and a cathode stacked in this order. The light-emitting layer and the functional layer are in contact with each other. Hole mobility of the light-emitting layer is greater than electron mobility of the light-emitting layer. The electron mobility of the light-emitting layer is equal to or greater than an effective electron mobility of the functional layer. A highest occupied molecular orbital (HOMO) level of a first functional material included in the light-emitting layer is at least 0.4 eV greater than a HOMO level of a second functional material included in the functional layer.

Abstract: Disclosed is a method for manufacturing an organic EL display panel in which a plurality of organic electroluminescence elements each including an organic layer are arranged on an upper side of a substrate. The method includes applying an ink obtained by dissolving or dispersing an organic material in a solvent to a preset application area over the substrate, and cooling the ink applied in the applying within a period until the ink is dried, to lower an ink temperature to a second temperature lower than a first temperature of the ink at a time of application thereof.

Abstract: Disclosed is a light-emitting layer-forming ink useful in forming an organic light-emitting layer for an organic EL element by a printing process, including a tetralin-based organic solvent, and a solute including an anthracene-based, low molecular material and dissolved at a concentration of 3% or higher and 12% or lower in the tetralin-based organic solvent.

Abstract: Provided is an organic electroluminescent element obtained by stacking an anode, a light emitting layer, an electron transport layer, and a cathode in that order, the organic electroluminescent element including an electron injection control layer in contact with both the light emitting layer and the electron transport layer, in which the light emitting layer contains a fluorescent material as a luminescent material, a lowest unoccupied molecular orbital level of a functional material contained in the electron injection control layer is higher than a lowest unoccupied molecular orbital level of a functional material contained in the electron transport layer by 0.1 eV or higher, and the lowest unoccupied molecular orbital level of the functional material contained in the electron injection control layer is equal to or higher than a lowest unoccupied molecular orbital level of a functional material contained in the light emitting layer.

Abstract: According to one embodiment, an ink for organic EL includes an organic EL contributing material and an organic solvent. A relative energy difference RED based on Hansen solubility parameters which attribute to the organic EL contributing material and the organic solvent, respectively, is less than 0.5.

Abstract: Disclosed is a method for manufacturing an organic EL display panel in which a plurality of organic electroluminescence elements each including an organic layer are arranged on an upper side of a substrate. The method includes applying an ink obtained by dissolving or dispersing an organic material in a solvent to a preset application area over the substrate, and cooling the ink applied in the applying within a period until the ink is dried, to lower an ink temperature to a second temperature lower than a first temperature of the ink at a time of application thereof.

Abstract: A method of producing an organic electroluminescent ink includes reducing ozone contained in an organic electroluminescent mixture comprising an organic electroluminescent material and a solvent.

Abstract: According to one embodiment, a solution for organic EL contains a mixed solvent of two or more kinds of organic solvents which contain at least a first organic solvent and a second organic solvent, and an organic EL contributing material dissolved into the mixed solvent. The coordinates (HSP coordinates) specified by Hansen solubility parameters of the first organic solvent are Hd in a range of 17.5 to 19.5 (J/cm3)1/2, Hp in a range of 3.5 to 5.5 (J/cm3)1/2 and Hh in a range of 3.5 to 5.5 (J/cm3)1/2. The HSP coordinates of the second organic solvent are Hd in a range of 17.5 to 19.5 (J/cm3)1/2, Hp in a range of 0 to 2.0 (J/cm3)1/2, and Hh in a range of 0.5 to 2.5 (J/cm3)1/2.

Abstract: According to one embodiment, an ink for organic EL includes an organic EL contributing material and an organic solvent. A relative energy difference RED based on Hansen solubility parameters which attribute to the organic EL contributing material and the organic solvent, respectively, is less than 0.5.

Abstract: A method of producing an organic electroluminescent ink includes reducing ozone contained in an organic electroluminescent mixture comprising an organic electroluminescent material and a solvent.

Abstract: Each of blue light emitting elements includes: a photoanode; a translucent cathode; an organic light emitting layer between the photoanode and the translucent cathode; a first functional layer between the organic light emitting layer and the photoanode; and a second functional layer between the organic light emitting layer and the translucent cathode, and has a resonator structure. The first functional layer has an optical film thickness of 48-62 nm. The translucent cathode is a stack of a first translucent conductive layer, a metal layer, and a second translucent conductive layer stacked in this order from the second functional layer side. The first translucent conductive layer has a refractivity of 2.0-2.4, and a film thickness of 85-97 nm. The metal layer has a refractivity different by 0 to 2.0 from that of the first translucent conductive layer, and has a film thickness of 2-22 nm.

Abstract: A method for manufacturing an organic semiconductor element including applying an organic semiconductor solution to a base is provided. The method includes, before the applying, bringing a pressure of an inert gas close to an ambient pressure while varying the pressure of the inert gas between a negative pressure and a positive pressure with respect to the ambient pressure. The inert gas is contained in a sealed container together with the organic semiconductor solution. The ambient pressure is a pressure of surroundings of the organic semiconductor solution in the applying.

Abstract: An ink jet device includes a plurality of ink jet heads each including an ink housing unit that houses therein ink, a pressure application unit that ejects a droplet of the ink by applying pressure to the ink, and a nozzle through which the droplet of the ink is ejected, wherein with respect to at least one of the plurality of ink jet heads, a preliminary drive operation and a main drive operation are performed, the preliminary drive operation is an operation of pushing the ink toward an outer edge of the nozzle to the extent that the droplet of the ink is not ejected through the nozzle, and the main drive operation is an operation of ejecting the droplet of the ink through the nozzle after performance of the preliminary drive operation.

Abstract: To provide a method of efficiently manufacturing an organic light-emitting element with excellent light-emitting characteristics by application, the method includes: preparing ink and filling an inkjet device having an ink ejection nozzle with the ink; preparing a substrate having a base layer including a first electrode; and positioning the inkjet device above the substrate, and causing the inkjet device to eject a drop of the ink onto the base layer, wherein, in the preparation of the ink, a value Z denoting a reciprocal of the Ohnesorge number Oh determined by density ? (g/dm3), surface tension ? (mN/m), and viscosity ? (mPa·s) of the ink and a diameter r (mm) of the ink ejection nozzle satisfies Formula 1, in the ejection of the drop of the ink, speed V (m/s) of the ejected drop satisfies Formula 2, and the value Z and the speed V (m/s) satisfy Formula 3.

Abstract: Each of blue light emitting elements includes: a photoanode; a translucent cathode; an organic light emitting layer between the photoanode and the translucent cathode; a first functional layer between the organic light emitting layer and the photoanode; and a second functional layer between the organic light emitting layer and the translucent cathode, and has a resonator structure. The first functional layer has an optical film thickness of 48-62 nm. The translucent cathode is a stack of a first translucent conductive layer, a metal layer, and a second translucent conductive layer stacked in this order from the second functional layer side. The first translucent conductive layer has a refractivity of 2.0-2.4, and a film thickness of 85-97 nm. The metal layer has a refractivity different by 0 to 2.0 from that of the first translucent conductive layer, and has a film thickness of 2-22 nm.

Abstract: A method of efficiently manufacturing an organic light-emitting element with excellent light-emitting characteristics is provided. The method includes: preparing ink and filling an inkjet device having an ink ejection nozzle with the ink; preparing a substrate having a base layer including a first electrode; positioning the inkjet device above the substrate; and causing the inkjet device to eject a drop of the ink onto the base layer. In the preparation of the ink, a value Z denoting a reciprocal of the Ohnesorge number Oh determined by density ? (g/dm3), surface tension ? (mN/m), and viscosity ? (mPa·s) of the ink and a diameter r (mm) of the ink ejection nozzle satisfies Formula 1, in the ejection of the drop of the ink, speed V (m/s) of the ejected drop satisfies Formula 2, and the value Z and the speed V (m/s) satisfy Formula 3.