Disclosed are the compound for an organic optoelectronic device, the compound being represented by Chemical Formula 1, a composition for an organic optoelectronic device including the compound for an organic optoelectronic device, an organic optoelectronic device, and a display device. ##STR00001## In Chemical Formula 1, each substituent is the same as defined in the specification.

Heteroleptic iridium complexes having the formula ##STR00001##
are disclosed. In this formula, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6, are selected from hydrogen, deuterium, cycloalkyl, deuterated cycloalkyl, alkyl, and deuterated alkyl, and can optionally be linked together to form a ring; at least one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 is cycloalkyl, deuterated cycloalkyl, alkyl, or deuterated alkyl; ring A is attached to the 4- or 5-position of ring B; and R and R′ can represent any of a variety of subsitutents. These iridium compounds contain alkyl substituted phenylpyridine ligands, which provide these compounds with beneficial properties when the iridium complexes are incorporated into OLED devices.

Disclosed is an organic electroluminescent device, comprising a substrate and light emitting units formed in sequence on the substrate, characterized in that, each of the light emitting units comprises a first electrode layer (1), a light emitting layer (2) and a second electrode layer (3), the light emitting layer comprises a host material and a dye, the host material is made of materials having both electron transport capability and hole transport capability; at least one material in the host material has a CT excited triplet state energy level T.sub.1 greater than its n-π excited triplet state energy level S.sub.1, and T.sub.1-S.sub.1≤0.3 eV; or, at least one material in the host material has a CT excited triplet state energy level T.sub.1 greater than its n-π excited triplet state energy level S.sub.1, and T.sub.1-S.sub.1≥1 eV, with the difference between its n-π excited second triplet state energy level and its CT excited first singlet state energy level being in the range of −0.1 eV to 0.1 eV. The organic electroluminescent device configuration can sufficiently utilize the triplet state energy in the host material and the dye to increase the luminous efficiency and prolong the service life of the device.

A metal-containing compound including a first ligand L.sub.A that is selected from one of the following structures: ##STR00001##
is disclosed.

Novel iridium complexes containing phenylpyridine and pyridyl aza-benzo fused ligands are described. These complexes are useful as light emitters when incorporated into OLEDs.

The present specification relates to an organic light emitting diode.

Novel electroluminescent devices containing bicarbazole triazine compounds as emissive dopants are described. Devices incorporating this class of compounds exhibit delayed fluorescence characteristics that showed EQE's far exceeding the theoretical limit for a conventional fluorescent device.

An organic light emitting element which realizes a high efficiency and long-life light emission is provided. An organic compound represented by the general formula [1] described in Claim 1 is provided. In the general formula [1], R.sub.1 to R.sub.3 are each independently selected from a hydrogen atom, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group. However, at least one of R.sub.1 to R.sub.3 represents the aryl group or the heterocyclic group. The aryl group represents a phenyl group, a naphthyl group, a phenanthrenyl group, a fluorenyl group, a triphenylenyl group, or a chrysenyl group. The heterocyclic group represents a dibenzofuranyl group or a dibenzothienyl group.

A composition of matter that includes a novel combination of host compounds containing indol-fused hosts and emissive dopants containing benzofuran or azabenzofuran ligand is disclosed,

A condensed cyclic compound represented by Formula 1 and an organic light-emitting device including the same. ##STR00001##