A quantum dot (QD) composite material includes at least two structural units arranged sequentially along a radial direction. The at least two structural units include a type A1 structural unit and a type A2 structural unit. The type A1 QD structural unit has a gradient alloy composition structure with an energy level width increasing along the radial direction toward a surface, and the type A2 QD structural unit has a gradient alloy composition structure with the energy level width decreasing along the radial direction toward the surface. The two types of QD structural units are arranged alternately along the radial direction, and the energy levels in adjacent QD structural units having gradient alloy composition structures are continuous.

A quantum dot (QD) composite material includes at least three QD structural units arranged sequentially along a radial direction. Among the at least three QD structural units, each QD structural unit at a center of the QD composite material and each QD structural unit at a surface of the QD composite material have a gradient alloy composition structure with an energy level width increasing along the radial direction from the center to the surface, along the radial direction, energy levels of adjacent gradient alloy composition structures of the QD structure units are continuous. A QD structural unit located between the QD structural units at the center and the QD structural units at the surface have a homogeneous alloy composition structure.

A large area active-matrix organic light-emitting diode microdisplay and method for fabricating the same is provided which includes a panel having resolution of greater than 2,000 pixels per inch and a size of 1.4 or more inches for supporting the needs of virtual reality and augmented reality application.

A composition including a quantum dot, a dispersing agent for dispersing the quantum dot, a polymerizable monomer including a carbon-carbon double bond, an initiator, a hollow metal oxide particulate, and a solvent, and a quantum dot-polymer composite manufactured from the composition.

Provided are a display panel and a manufacturing method therefor, and a display apparatus. The display panel includes a plurality of sub-pixels of at least two colors and further comprises: a base substrate; a first electrode on the base substrate; an electron transport layer at the side of the first electrode facing away from the base substrate; a quantum dot light-emitting layer at the side of the electron transport layer facing away from the base substrate; and a second electrode at the side of the quantum dot light-emitting layer facing away from the base substrate. Materials of the quantum dot light-emitting layer of the sub-pixels of different colors are different. The electron transport layer is of an alloy heterostructure at least composed of a metal oxide and a metal chalcogenide. Contents of the metal chalcogenide in the alloy heterostructure at positions of the sub-pixels of different colors are different.

A compound including a first ligand L.sub.A selected from the following group:

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is disclosed.

The present disclosure provides a hole transport material, a quantum dot light-emitting device and a manufacturing method thereof and a display apparatus. A surface of a quantum dot is modified with a ligand capable of being cross-linked with a modifying group of the hole transport material, that is, a cross-linking group in the ligand, so that when the quantum dot light-emitting device is manufactured, the cross-linking group of the quantum dot material is cross-linked with the modifying group of the hole transport material under a set external stimulus, so that the coupling degree between a light-emitting layer and a hole transport layer is increased and an interface structure between the light-emitting layer and the hole transport layer is weakened, thus facilitating carrier transmission. Under the condition of not sacrificing the transmission rate of electrons, hole injection is increased to the greatest extent, so as to regulate the injection balance of carriers, improve the carrier recombination rate of the quantum dot light-emitting device, and further improve the luminous efficiency and other device performances of the quantum dot light-emitting device. Moreover, the increase of hole injection will reduce the aggregation of carriers at an interface, thereby improving the stability of the device.

A light emitting device comprises a first electrode, a second electrode, and an emissive layer (EML) between the first electrode and the second electrode and electrically connected to the first electrode and the second electrode. The EML comprises a charge transport matrix of a first polarity, a plurality of quantum dots in the charge transport matrix, and a plurality of charge transport nanoparticles of a second polarity in the charge transport matrix.

An organic electroluminescence element in an embodiment according to the present invention includes a first electrode, a third electrode including a region overlapping the first electrode, a first insulating layer between the first electrode and the third electrode, a second insulating layer between the first insulating layer and the third electrode, an electron transfer layer between the first insulating layer and the third electrode, a light emitting layer, containing an organic electroluminescence material, between the electron transfer layer and the third electrode, and a second electrode located between the first insulating layer and the second insulating layer and electrically connected with the electron transfer layer. The organic electroluminescence element includes an overlap region where the third electrode, the light emitting layer, the electron transfer layer, the first insulating layer and the first electrode overlap each other in an opening of the second insulating layer.

The disclosure provides an organic light-emitting display screen and a manufacturing method thereof. The organic light-emitting display screen includes a filter substrate, and further includes a color filter layer, a cathode layer, an organic light-emitting layer and an anode array sequentially formed on the filter substrate. The anode array includes a number of anode units spaced apart from each other, the color filter layer includes a number of filter units, and each of the anode units corresponds to each of the filter units.