The present disclosure provides a quantum rod, a quantum rod film including the same, and a display device including the same. The quantum rod includes a core, a shell layer, and a rod-shaped protective layer. The core is composed of cadmium sulfide. The shell layer is composed of zinc selenide and covers the core. The rod-shaped protective layer is composed of zinc sulfide and covers the shell layer.

Disclosed is a zinc oxide-based quantum dot aggregate capable of emitting white light is a mixture of a zinc oxide quantum dot and a zinc oxide-graphene quantum dot, in which the zinc oxide quantum dot emits yellow light when being irradiated with an excitation wavelength shorter than a wavelength corresponding to an energy band gap of the zinc oxide quantum dot, the zinc oxide-graphene quantum dot is in a form in which a zinc oxide quantum dot is bound with graphene via a ZnOC bond and emits blue-based light, and white light emission is possible through color rendering of yellow light emission by the zinc oxide quantum dot and blue-based light emission by the zinc oxide-graphene quantum dot.

The invention is in the field of nanostructure synthesis. Provided are highly luminescent nanostructures, particularly highly luminescent quantum dots, comprising a nanocrystal core and a thin inner shell layer. The nanostructures may have an additional outer shell layer. Also provided are methods of preparing the nanostructures, films comprising the nanostructures, and devices comprising the nanostructures.

A light-emitting element includes an anode electrode, a QD layer containing QDs, and a cathode electrode, in which the QDs are Cd-free quantum dots having a core-shell structure including a core containing at least Ag, Ga, and at least one of S and Se, and a shell containing at least Zn, and exhibit fluorescence characteristics with a fluorescence full-width at half-maximum of 40 nm or less and a fluorescence quantum yield percentage of 70% or more.

A quantum dot including a core and a shell disposed on the core wherein one of the core and the shell includes a first semiconductor nanocrystal including zinc and sulfur and the other of the core and the shell includes a second semiconductor nanocrystal having a different composition from the first semiconductor nanocrystal, the first semiconductor nanocrystal further includes a metal and a halogen configured to act as a Lewis acid in a halide form, an amount of the metal is greater than or equal to about 10 mole percent (mol %) based on a total number of moles of sulfur, and an amount of the halogen is greater than or equal to about 10 mol % based on a total number of moles of sulfur, a method of producing the same, and a composite and an electronic device including the same.

A method of producing an electroluminescent device, the method including: disposing a light emitting layer including a semiconductor nanoparticle on a first electrode; applying a composition including a zinc oxide nanoparticle onto the light emitting layer to form an electron transport layer, the zinc oxide nanoparticle including a first metal and an alkali metal; and disposing the second electrode on the electron transport layer to produce the electroluminescent device, wherein a preparation of the zinc oxide nanoparticle includes admixing a first solution including a zinc precursor and a first metal precursor in a solvent with a second base and optionally a first base to prepare the zinc oxide nanoparticle, wherein the first base includes an organic base containing a C1 to C50 organic group, and the second base includes an inorganic base including the alkali metal.

A quantum dot-containing composition includes a quantum dot, a ligand having coordinating groups, which coordinates to the surface of the quantum dots, and the ligand is represented by Formula I.

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In Formula I, A is an organic group including one or more coordinating groups selected from an amino group, a carboxy group, a mercapto group, a phosphine group, and a phosphine oxide group, Z is an (n+m+l)-valent organic linking group, R is a group including an alkyl group, an alkenyl group, or an alkynyl group each of which may have a substituent, Y is a group having a polymer chain which has a degree of polymerization of 3 or greater and which includes a polyacrylate skeleton or the like. n and m are each independently 1 or greater, l is 0 or greater, and n+m+l is integer 3 or greater. At least two coordinating groups are included in a molecule.

The present disclosure provides a zinc oxide ink and a method for manufacturing the same, an electron transport layer and a display device. The zinc oxide ink includes zinc oxide nanoparticles loaded with ligands, wherein the ligand is derived from aliphatic compounds having a carbon chain of three or more carbon atoms and the ligand has a cross-linkable group at a site close to a coordination atom. The zinc oxide ink increases the steric hindrance among the zinc oxide nanoparticles, thereby preventing the aggregation between the zinc oxide nanoparticles, and accordingly and further avoiding the formation of black points in the formed layer. Meanwhile, the ligands have self-crosslinking property and thus form a web-like structure to prevent the formation of pores in the layer due to the rapid volatilization of the solvent, and the quality of the formed layer by using the zinc oxide ink is ensured.

A quantum rod, a synthesis method of the quantum rod and a quantum rod display device are discussed. The quantum rod according to an embodiment includes a core, a first shell covering the core, and a second shell covering a side of the first shell. In the quantum rod, a first thickness of the first shell is greater than a second thickness of the second shell, and a first length of the first shell is smaller than a second length of the second shell.

A light-emitting element includes an anode electrode, a QD layer containing QDs, and a cathode electrode, in which the QDs have a core-shell structure including a core and a shell and are Cd-free QDs that emit blue light, the QDs contain halogen elements, and an external quantum efficiency percentage of the light-emitting element is 7% or more.