An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer. The organic layer includes a first compound represented by Formula 1 and a second compound represented by Formula 2. The first compound may be included in an emission layer, and the second compound may be included in an electron transport region. ##STR00001##

Provided are a perovskite light emitting device containing an exciton buffer layer, and a method for manufacturing the same. A light emitting device of the present invention comprises: an exciton buffer layer in which a first electrode, a conductive layer disposed on the first electrode and comprising a conductive material, and a surface buffer layer containing fluorine-based material having lower surface energy than the conductive material are sequentially deposited; a light-emitting layer disposed on the exciton buffer layer and containing a perovskite light-emitter; and a second electrode disposed on the light-emitting layer. Accordingly, a perovskite is formed with a combined FCC and BSS crystal structure in a nanoparticle light-emitter. The present invention can also form a lamellar or layered structure in which an organic plane and an inorganic plane are alternatively deposited; and an exciton can be bound by the inorganic plane, thereby being capable of expressing high color purity.

According to one embodiment, provided is an electrochromic device including an electrochromic layer, which contains a tungsten oxide material. The tungsten oxide material includes potassium-containing tungsten oxide particles having an average particle size of 100 nm or less. The potassium-containing tungsten oxide particles contain potassium within a range of 1 mol % to 50 mol %, and include a central section and a peripheral section adjacent to the central section. A periodicity of a crystal varies between the central section and the peripheral section.

Provided are a method of producing a thiogallate-based fluorescent material, a method of producing a light-emitting device, a thiogallate-based fluorescent material, and a light-emitting device. The method of producing a thiogallate-based fluorescent material includes preparing a first solution containing at least one M1 ion selected from the group consisting of Sr, Be, Mg, Ca, Ba and Zn, and at least one M2 ion selected from the group consisting of Eu and Ce, and a second solution containing a sulfite ion, simultaneously supplying the first solution and the second solution to a reactor to obtain a powder containing a sulfite that contains an element M1 and an element M2, mixing a raw material that contains the powder containing the sulfite that contains the element M1 and the element M2 and a powder containing a gallium compound, with lithium chloride to obtain a mixture, and heat-treating the mixture to obtain a thiogallate-based fluorescent material.

An organometallic compound represented by Chemical Formula 1 may be used in a composition for depositing a thin film including the organometallic compound, where A is derived from a compound represented by Chemical Formula 2:

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Embodiments of the present disclosure include the thin film, a manufacturing method for the thin film using the composition for depositing the thin film, and a semiconductor device including the thin film.

The present invention relates to metal complexes, to compositions and formulations comprising these complexes, and to devices comprising the complexes or compositions.

A double fluorescent particle comprises: a core with a first fluorescence; and a molecularly imprinted polymer (MIP) shell with a second fluorescence; wherein the MIP is an organic polymer comprising elements selected from the group consisting of: C, H, O, N, P, and S; wherein the MIP is adapted to selectively bind to a cell surface structure; wherein the first fluorescence is generated by an entity selected from the group consisting of: a carbon nanodot, an alkaline earth metal fluoride, a dye-doped polymer, a dye-doped stabilized micelle, a P-dot—i.e. a π-conjugated polymer, a quantum dot doped polymer, a rare earth metal ion doped polymer, a dye-doped silica, a rare-earth ion doped silica, and a rare earth ion doped alkaline earth metal fluoride nanoparticle; wherein the second fluorescence is generated by an entity selected from the group consisting of: a dye, a molecular probe, an indicator, a probe monomer, an indicator monomer, and a cross-linker, and wherein the first and second fluorescence differ at least by an emission wavelength and/or by an excitation wavelength.

The present specification provides a hetero-cyclic compound and an organic light emitting device comprising the same.

Provided are a luminescent compound represented by Formula 1, a method of preparing the same, and a light-emitting device including the same:

[A.sup.1.sub.nA.sup.2.sub.(3n)][B.sup.1.sub.mB.sup.2.sub.(2m)]X.sub.5 Formula 1

wherein, in Formula 1, A.sup.1, A.sup.2, B.sup.1, B.sup.2, n, m, and X are as defined in the specification.

There are provided a quantum dot light emitting diode based on a quantum dot of which a surface is passivated with a short chain ligand, and a method of manufacturing the same.