A light-emitting element containing a light-emitting material with high light emission efficiency is provided. The light-emitting element includes a high molecular material and a guest material. The high molecular material includes at least a first high molecular chain and a second high molecular chain. The guest material has a function of exhibiting fluorescence or converting triplet excitation energy into light emission. The first high molecular chain and the second high molecular chain each include a first skeleton, a second skeleton, and a third skeleton, and the first skeleton and the second skeleton are bonded to each other through the third skeleton. The first high molecular chain and the second high molecular chain have a function of forming an excited complex.

A light-emitting device includes a first electrode, a second electrode and a light-emitting layer arranged between the first electrode and the second electrode. The light-emitting layer includes a thermally activated delayed fluorescence (TADF) material, and the TADF material includes a donor, an acceptor, and a linking group connected between the donor and the acceptor. The donor includes a donor base unit, and a substituent connected to the donor base unit, and atoms in the donor base unit are located in a first plane. The acceptor includes an acceptor base unit, and a substituent connected to the acceptor base unit, and atoms in the acceptor base unit are located in a second plane. The linking group includes a linking base unit, and a substituent connected to the linking base unit, and atoms in the linking base unit are located in a third plane.

The embodiments of the present disclosure provide a light-emitting device and a display substrate, which belong to the technical field of organic light-emitting diodes. The light-emitting device of the present disclosure comprises: a first light-emitting layer comprising a first host material and a first guest material; and a second light-emitting layer comprising a second host material and a second guest material; S1(h1)>S1(g1), T1(h1)>T1(g1), S1(g1)−T1(g1)≤0.1 eV; S1(h2)>S1(g2), T1(h2)>T1(g2), S1(g2)−T1(g2)≤0.1 eV; S1(h1)≥S1(h2)>S1(g1)>S1(g2), T1(h1)≥T1(h2)>T1(g1)>T1(g2); the second guest material is a TADF material; at least 40% of the area in a region covered under the emission spectrum of the first light-emitting layer overlaps with the region covered under the absorption spectrum of the second light-emitting layer.

A heterocyclic compound represented by Formula 1: ##STR00001##
wherein A.sub.1 in Formula 1 is selected from groups represented by Formulae 1-1 to 1-7, ##STR00002##
and an organic light-emitting device including the same.

An object of the present invention is to provide a material for a highly efficient and highly durable organic EL device, and specifically, an organic compound with excellent properties including excellent hole-injecting/transporting performance, electron-blocking capability, and high stability in the form of a thin film. Another object of the present invention is to provide a highly efficient and highly durable organic EL device by using this compound. The present invention is directed to an arylamine compound having a fluorenyl skeleton-containing heterocycle structure, with excellent heat resistance and good hole-transporting capability. An organic EL device including this compound in its hole-transporting layer, electron-blocking layer, light-emitting layer, or hole-injecting layer exhibited good device characteristics.

The present disclosure provides four monocarborane cluster-containing platinum complexes and a preparation method and an OLED application. The monocarborane cluster-containing platinum complex has a general structural formula selected from the group consisting of the following general structural formulas:

##STR00001##

wherein —R.sub.1 is selected from the group consisting of C.sub.4-12 linear alkyl; each R and R.sub.5 are independently any one selected from the group consisting of —CH.sub.3, H, tert-butyl and aryl; aryl is any one selected from the group consisting of phenyl, carbazole

##STR00002##

and aniline

##STR00003##

wherein R.sub.2 is any one selected from the group consisting of methyl, tert-butyl and phenyl; R.sub.3 is any one selected from the group consisting of methyl, tert-butyl and phenyl; n is 1 to 3; X is C element; when the ligand of the general structural formula is triazole, X is N element; —CB.sub.11H.sub.11 is monocarborane with a structure of

##STR00004##

A novel compound represented by formula (G1) is provided. ##STR00001##
In formula (G1), A represents a substituted or unsubstituted condensed aromatic ring having 10 to 30 carbon atoms or a substituted or unsubstituted condensed heteroaromatic ring having 10 to 30 carbon atoms, and Z.sup.1 to Z.sup.3 each independently have a structure represented by formula (Z-1) or (Z-2). In formula (Z-1), X.sup.1 and X.sup.2 each independently represent any one of an alkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, a cycloalkyl group having a bridge structure and having 7 to 10 carbon atoms, and a trialkylsilyl group having 3 to 12 carbon atoms. In addition, Ar.sup.1 to Ar.sup.4 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 13 carbon atoms, and at least one of Ar.sup.1 to Ar.sup.4 has the same substituent as X.sup.1 or X.sup.2.

An organic light-emitting device and an apparatus including the same are disclosed. The organic light-emitting device includes: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode. The organic layer includes an emission layer, the emission layer includes a first compound, a second compound, a third compound, and a fourth compound, the first compound is represented by Formula 1, the second compound is represented by Formula 2A or Formula 2B, the third compound is represented by Formula 3, the fourth compound is represented by Formula 4, each as respectively described in the detailed description.

An organic light-emitting device including: a first electrode and a second electrode each having a surface opposite the other; and an intermediate layer disposed between the first electrode and the second electrode, the intermediate layer including a first compound and a second compound, wherein the first compound includes a first silyl group-containing group and at least two carbazole-derived groups, wherein one carbazole-derived group of the at least two carbazole-derived groups is bonded via a N atom to another carbazole-derived group, the second compound includes a second silyl group-containing group, a triazine group, and a carbazole-derived group, and at least one of the first compound or the second compound has a triplet (T.sub.1) energy level of 2.81 eV or more.

An organometallic compound, represented by Formula 1:

##STR00001## wherein M.sub.1 is a transition metal; X.sub.10 is C; X.sub.11 to X.sub.14, X.sub.20, X.sub.30 to X.sub.36, and X.sub.40 are each independently C or N; ring A.sub.20 and ring A.sub.40 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group; and R.sub.1 to R.sub.5, R.sub.10, R.sub.20, R.sub.31, R.sub.32, R.sub.40, R.sub.51, R.sub.52, T.sub.1, b10, b20, b31, b32, and b40 are as defined herein.