A display device of the present disclosure includes a light emitting unit, multilayer cathode electrodes stacked on the light emitting unit in two or more layers with a protective film interposed between the cathode electrodes and electrically connected to each other, and a potential supply wire that applies predetermined potential to the multilayer cathode electrodes. Then, the cathode electrodes of second and subsequent layers out of the multilayer cathode electrodes are electrically connected to the potential supply wire via a first contact hole.

A display device includes a thin film transistor layer, a light-emitting element layer including a plurality of light-emitting elements, each including a first electrode, a function layer, and a second electrode, and each having a different luminescent color. The function layer includes a light-emitting layer and a pair of holding layers sandwiching the light-emitting layer and each including a photosensitive material. One of the first electrode and the second electrode is an anode electrode and the other is a cathode electrode. The function layer includes a hole transport layer provided between the anode electrode and one holding layer of the pair of holding layers, and an electron transport layer provided between the cathode electrode and the other holding layer of the pair of holding layers.

A method of manufacturing a display device includes: the measurement step of sweeping a voltage to light-emitting elements and measuring a current value that flows in the light-emitting elements in response to a voltage value applied; the computation step of computing a first derivative value of the current value with respect to the voltage value, the first derivative value representing voltage dependence of a first derivative of the current value; the peak determination step of determining a peak of the first derivative value; the processing step of processing the light-emitting elements based on a result of the peak determination step; and the attaching step of attaching a housing to the substrate.

To provide a composition having a very low refractive index, an organic photoelectronic element using the composition, and simple methods for producing such a composition and an organic photoelectronic element. A composition comprising a fluorinated polymer, an organic semiconductor material and a dopant.

To provide a composition having a very low refractive index, an organic photoelectronic element using the composition, and simple methods for producing such a composition and an organic photoelectronic element. A composition comprising a fluorinated polymer, an organic semiconductor material and a dopant.

An organic device includes at least one electrode, an insulating layer adjacent to the at least one electrode in a plan view, and an organic layer that is continuously in contact with an upper surface of the at least one electrode and an upper surface of the insulating layer. The organic layer contains a polymer of an organic material. The organic material contains a basic molecular skeleton and a polymerizable functional group. In the polymer, the organic material is polymerized through the polymerizable functional group.

A quantum dot including a core comprising a first semiconductor nanocrystal including a zinc chalcogenide and a semiconductor nanocrystal shell disposed on the surface of the core and comprising zinc, selenium, and sulfur. The quantum dot does not comprise cadmium, emits blue light, and may exhibit a digital diffraction pattern obtained by a Fast Fourier Transform of a transmission electron microscopic image including a (100) facet of a zinc blende structure. In an X-ray diffraction spectrum of the quantum dot, a ratio of a defect peak area with respect to a peak area of a zinc blende crystal structure is less than about 0.8:1. A method of producing the quantum dot, and an electroluminescent device including the quantum dot are also disclosed.

A display device has a thin-film transistor layer, a light-emitting layer including a plurality of light-emitting elements each of which includes a first electrode, a functional layer, and a second electrode, and that emit mutually different colors of light. The functional layer contains a functional material that contributes to the function of the functional layer, and an additive added to the functional layer in a predetermined range of additive amount and having a smaller size than the functional material. The functional layer includes a quantum-dot light-emitting layer containing a quantum dot. The additive added to a quantum-dot light-emitting layer has a size that decreases in an order of a red quantum-dot light-emitting layer, a green quantum-dot light-emitting layer and a blue quantum-dot light-emitting layer, in accordance with a size of a corresponding quantum dot.

A display device includes a plurality of sub-pixels, a support body, a thin-film-transistor layer, a light-emitting-element layer, and a sealing layer. The thin-film-transistor layer includes a plurality of thin-film transistors and a planarization film. The light-emitting-element layer includes a plurality of light-emitting elements. Each of the plurality of light-emitting elements includes a lower electrode, a functional layer, and an upper electrode. The lower electrode is a sub-pixel electrode shaped into an island and provided for each of the sup-pixel electrodes. The upper electrode is a common electrode formed in common among all the plurality of sub-pixels. The planarization film includes a trench shaped into a frame and provided for each of the sub-pixels. The trench defines a light-emitting region of the light-emitting element for each of the sub-pixels.

A method for manufacturing a display device, including: a step of applying a first mixture obtained by mixing green quantum dots and a photosensitive resin on a green electron transport layer, an exposure step of pattern-exposing the first mixture to cure a portion of the first mixture, the portion being a green light-emitting layer; a development step of removing an uncured portion of the first mixture and developing the green light-emitting layer; and an etching step of etching the green electron transport layer with an etching solution that is an alkaline solution or an organic solvent using the green light-emitting layer as a mask.