Provided are: an organic electronic material which can be easily multilayered and that can be used in substrates, such as resin, that cannot be processed at high temperatures; an ink composition containing the same; an organic thin film formed using said organic electronic material or said ink composition; and an organic electronic element and an organic EL element that are formed using said organic thin film and that have a superior luminous efficacy and emission lifespan than conventional elements. Specifically, provided are: an organic electronic material that is characterized by containing an oligomer or a polymer having a structure that branches into three or more directions and has at least one polymerizable substituent; an ink composition containing said organic electronic material; and an organic thin film prepared using the aforementioned organic electronic material. Further, provided are an organic electronic element and an organic electroluminescent element containing said organic thin film.

Provided are light-emitting particles having high stability while having perovskite-type semiconductor nanocrystals having excellent light-emitting properties, a method for producing the same, and a light-emitting particle dispersion, an ink composition, and a light-emitting element containing such light-emitting particles. The method for producing light-emitting particles of the present invention includes a step of preparing parent particles 91 composed of perovskite-type semiconductor nanocrystals 911 having light-emitting properties and a surface layer 912 which is composed of ligands coordinated on the surface of the semiconductor nanocrystal 911 and in which the ligand molecules form a siloxane bond with each other, and a step of forming a polymer layer 93 by coating the surface of the parent particle 91 with a hydrophobic polymer.

A light emitting device with excellent light emission efficiency is provided. The light emitting device has an anode, a cathode, a first layer disposed between the anode and the cathode, and a second layer disposed between the anode and the first layer. The second layer is a layer containing a crosslinked product of a compound having a crosslinkable group selected from Group A, and at least one of the first layer and the second layers contains a compound represented by the formula (T-1). The compound having a crosslinkable group is a polymer compound having a crosslinkable group selected from Group A:

##STR00001## ##STR00002##

Provided are an organometallic compound represented by Formula 1, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound:
M(L.sub.1).sub.n1(L.sub.2).sub.n2  Formula 1 wherein, in Formula 1, M, L.sub.1, L.sub.2, n1 and n2 may each be understood by referring to the descriptions thereof provided herein.

An organic electronic material that includes a charge transporting polymer which has a branched structure and has a structural unit having a structure represented by Formula (1).

The present disclosure provides a light emitting device having an anode and a cathode, and a first layer and a second layer disposed between the anode and the cathode.

It is an object of the present invention to provide a composition for light emitting diodes with which it is possible to obtain an organic EL element that includes an organic layer formed using a high molecular weight material and whose service life can be extended as compared with that of conventional organic EL elements. The present invention provides a composition for light emitting diodes containing a high molecular weight compound and a thermally crosslinkable low molecular weight compound, wherein the thermally crosslinkable low molecular weight compound includes a compound that has two or more thermally crosslinkable structures in a molecule. The thermally crosslinkable low molecular weight compound preferably includes a compound that contains two or more thermally crosslinkable structures selected from the group consisting of an acrylate structure, a methacrylate structure, and a maleimide structure in a molecule.

Cooperative energy pooling systems based on polymeric acceptors are provided herein. These systems exhibit delayed excitation of the acceptor when excited at sensitizer absorption wavelengths, and displayed CEP occurring on a timescale of tens to hundreds of picoseconds.

Provided are an organometallic compound represented by Formula 1, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound:

M(L.sub.1).sub.n1(L.sub.2).sub.n2  Formula 1 wherein, in Formula 1, M, L.sub.1, L.sub.2, n1 and n2 may each be understood by referring to the descriptions thereof provided herein.

A thermally activated delayed fluorescent material and a synthesizing method thereof are described. The thermally activated delayed fluorescent material has a structural formula as follows: ##STR00001##
Group A, group B, group C, and group D are all structural groups in the thermally activated delayed fluorescent material, where x, y, and z are molar ratios of the group B, the group C and the group D in the thermally activated delayed fluorescent material, respectively. A white light polymer material with high luminous efficiency is synthesized by using polystyrene as a main chain, and connecting red, green, and blue light-emitting structural units to side chains thereof. An OLED light-emitting layer prepared by using the thermally activated delayed fluorescent material has relatively high lifespan and good light-emitting performance.