The present disclosure relates to the technical field of display, and specifically relates to an organic electroluminescent device, and in particular, to a highly efficient fluorescence device. An organic electroluminescent device includes a hole transport layer, and a light-emitting layer. The hole transport layer and the light-emitting layer has an interface exciplex formed at an interface therebetween.

Disclosed are a quantum dot-containing material, a method of preparing the quantum dot-containing material, a composition including the quantum dot-containing material, and a light-emitting device including the quantum dot-containing material.

The present application can provide a nanoparticle, a method for patterning a nanoparticle layer and a light emitting device. When the nanoparticle provided by the present application is adopted for manufacturing a light emitting layer of the light emitting device, a cross-linking reaction occurs among first ligands of adjacent nanoparticles under irradiation of ultraviolet light, and the cross-linked nanoparticles may be firmly connected to a front film layer of the light emitting layer, so that when a developing solution is adopted for developing treatment, the cross-linked nanoparticles are not insoluble in the developing solution and are retained while non-cross-linked nanoparticles are dissolved in the developing solution and are separated from the front film layer to be removed, therefore completing patterning of the nanoparticle layer.

A light emitting device includes a first electrode, a hole transporting layer in contact with the first electrode, a second electrode, an electron transporting layer in contact with the second electrode; and an emissive layer between the hole transporting layer and the electron transporting layer. The emissive layer includes a metal-assisted delayed fluorescent (MADF) emitter, a fluorescent emitter, and a host, and the MADF emitter harvests electrogenerated excitons and transfers energy to the fluorescent emitter.

A compound of Formula (L.sub.A).sub.n-M-(L.sub.C).sub.m, wherein the ligand L.sub.A is of Formula I, and the ligand L.sub.C is selected from Formula I that is different than ligand L.sub.A, a monoanionic bidentate ligand, or a monoanionic monodentate ligand. M is a metal; and n is 1 or 2, and m is 0, 1 or 2. ##STR00001## Ring A is a 5-membered or 6-membered heteroaryl ring, which is bonded to Ring B; Z is selected from O or S; Z.sup.1 is selected from a carbene C or N; and Z.sup.2 is selected from C or N. Moreover, two adjacent ring carbons of Ring B will form a group of formula D, wherein * represents the point of attachment to the two adjacent ring carbons, ##STR00002## Formula D, wherein X is selected from NR.sup.N, O, S, or Se; and R.sup.N is selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, heteroalkyl, aryl, heteroaryl, and combinations thereof; and Y.sup.1, Y.sup.2, Y.sup.3, and Y.sup.4 are independently CR.sup.Y1, CR.sup.Y2, CR.sup.Y3, and CR.sup.Y4, respectively, or N, and Ring D has no more than two nitrogen ring atoms. An OLED that includes a compound of the Formula I above in an organic layer is also described.

An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; a first emission unit and a second emission unit between the first electrode and the second electrode; and a first charge generation layer between the first emission unit and the second emission unit; wherein the first emission unit includes a first emission layer and a first inorganic buffer layer, and the second emission unit includes a second emission layer and a second inorganic buffer layer.

An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; a first emission unit and a second emission unit between the first electrode and the second electrode; and a first charge generation layer between the first emission unit and the second emission unit; wherein the first emission unit includes a first emission layer and a first inorganic buffer layer, and the second emission unit includes a second emission layer and a second inorganic buffer layer.

A light emitting device and a production method thereof. The light emitting device includes a light emitting layer including a plurality of quantum dots, and an electron auxiliary layer disposed on the light emitting layer, the electron auxiliary layer configured to transport electrons, inject electrons into the light emitting layer, or a combination thereof, wherein the electron auxiliary layer includes a plurality of metal oxide nanoparticles and a nitrogen-containing metal complex. The metal oxide nanoparticles include zinc and optionally a dopant metal, the dopant metal includes Mg, Co, Ga, Ca, Zr, W, Li, Ti, Y, Al, Co, or a combination thereof and a mole ratio of nitrogen to zinc in the electron auxiliary layer is greater than or equal to about 0.001:1.

Disclosed are a quantum dot material, a method for patterning a quantum dot film and a quantum dot light emitting device. when preparing a patterned quantum dot film, firstly, a quantum dot film is made by using the quantum dot material with the photolysis group, and a corresponding region of the quantum dot film is irradiated with ultraviolet light under the shielding of a mask template, so that the photolysis group in the corresponding region is photolyzed into the polarity change group, thereby changing the solubility of the quantum dot material in the corresponding region; and subsequently, the quantum dot film is cleaned by using a solvent which can dissolve the quantum dot material with the photolysis group, the quantum dot material in non-irradiated regions is dissolved and removed, and the quantum dot material in the corresponding region is retained to form a pattern of the quantum dot film.

The present invention relates to an electronic device comprising between a first electrode and a second electrode at least one first hole transport layer, wherein the first hole transport layer comprises (i) at least one first hole transport matrix compound consisting of covalently bound atoms and (ii) at least one electrical p-dopant selected from metal salts and from electrically neutral metal complexes comprising a metal cation and a at least one anion and/or at least one anionic ligand consisting of at least 4 covalently bound atoms, wherein the metal cation of the electrical p-dopant is selected from alkali metals; alkaline earth metals, Pb, Mn, Fe, Co, Ni, Zn, Cd; rare earth metals in oxidation state (II) or (III); Al, Ga, In; and from Sn, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W in oxidation state (IV) or less; provided that a) p-dopants comprising anion or anionic ligand having generic formula (Ia) or (Ib). ##STR00001##