The present specification provides a compound having a spiro structure, and an organic light emitting device including the same.

A light emitting device including a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region is provided. The electron transport region includes a polycyclic compound represented by Formula 1:

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The present invention discloses a phenanthroline-based compound and an organic EL device employing the compound as phosphorescent light emitting host material of a light emitting layer and/or electron transporting layer material and/or hole blocking layer material and/or a thermally activated delayed fluorescence (TADF) material of a light emitting layer which can display good performance.

The present invention relates to a plurality of host materials and an organic electroluminescent device comprising the same. By comprising a specific combination of a plurality of host compounds, the organic electroluminescent device according to the present invention provides excellent lifespan characteristics while maintaining high luminous efficiency.

An organic electroluminescent material is shown in the following general formula (1),

{[M(L)(H.sub.2O).sub.x].(H.sub.2O).sub.y}.sub.n  General Formula (1) wherein x is between 1 and 4, y is between 1 and 8, and n is a positive integer. M is any one selected from the group consisting of beryllium (Be), strontium (Sr), and radium (Ra). L is an organic ligand containing a naphthalene group and an anhydride group. M and L form metal-organic frameworks. An organic electroluminescent device containing the organic electroluminescent material is also disclosed.

Colloidal perovskite nanoplatelets can provide a material platform, with tunability extending from the deep UV, across the visible, into the near-IR. The high degree of spectral tunability can be achieved through variation of the cation, metal, and halide composition as well as nanoplatelet thickness.

A nanocrystal represented by the following Formula 1 and a preparation method thereof:

AMX.sub.3L   Formula 1 wherein A is cesium (Cs), rubidium (Rb), or an ammonium salt, M is germanium (Ge), tin (Sn), or lead (Pb), X is one or more selected from Cl, Br and I, and L is an organic functional group having one terminal selected from a phosphonic acid group, a carboxylic acid group, and an amino group.

Provided are a perovskite optoelectronic device containing an exciton buffer layer, and a method for manufacturing the same. The optoelectronic 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 photoactive layer disposed on the exciton buffer layer and containing a perovskite photoactive layer; and a second electrode disposed on the photoactive layer. Accordingly, a perovskite is formed with a combined FCC and BSS crystal structure in a nanoparticle photoactive layer. 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.

The present application discloses a composite light-emitting material, a production method thereof, and use thereof, wherein the composite light-emitting material has a perovskite nanomaterial and a matrix; the perovskite nanomaterial comprises γ-CsPbI.sub.3 and an addition element M; and the addition element M is selected from at least one of Li, Na, K, and Rb.

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.

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