An organic electroluminescent material is shown in General Formula (1),

##STR00001##

wherein one of X1, X2, and X3 is an independent nitrogen atom, and R1 to R14 are each independently selected from the group consisting of a hydrogen atom, a fluorine atom, a cyano group, an alkyl group, a cycloalkyl group, an alkoxy group, a thioalkyl group, a silyl group, and an alkenyl group.

Discussed is an organic electroluminescent device including a first charge carrying layer being disposed adjacent to a first electrode; and a second charge carrying layer disposed adjacent to a second electrode, wherein the first charge carrying layer includes an emitting part, a hole injection part and a hole transporting part between the hole injection part and the emitting part, wherein at least one of the hole injection part, the hole transporting part and the emitting part includes a host material having an organic compound of Formula: ##STR00001##
wherein R is substituted or non-substituted C1 to C12 alkyl, and A and B are symmetrically or asymmetrically positioned in 2-position or 7-position of the fluorene core, and wherein each of A and B is independently selected from substituted or non-substituted aromatic group or substituted or non-substituted heterocyclic group.

Discussed is an organic electroluminescent device including a first charge carrying layer being disposed adjacent to a first electrode; and a second charge carrying layer disposed adjacent to a second electrode, wherein the first charge carrying layer includes an emitting part, a hole injection part and a hole transporting part between the hole injection part and the emitting part, wherein at least one of the hole injection part, the hole transporting part and the emitting part includes a host material having an organic compound of Formula: ##STR00001##
wherein R is substituted or non-substituted C1 to C12 alkyl, and A and B are symmetrically or asymmetrically positioned in 2-position or 7-position of the fluorene core, and wherein each of A and B is independently selected from substituted or non-substituted aromatic group or substituted or non-substituted heterocyclic group.

A dual host system for OLEDs that contains hole-transporting indolocarbazole and electron-transporting indolocarbazole exhibiting superior performance in the OLEDs is disclosed.

Embodiments provide a light-emitting element that includes: a first electrode, a second electrode disposed on the first electrode, an emission layer disposed between the first electrode and the second electrode and including a quantum dot, a hole transport region disposed between the first electrode and the second electrode, and an electron transport region disposed between the first electrode and the second electrode. The emission layer is disposed between the hole transport region and the electron transport region. At least one of the hole transport region and the electron transport region includes a metal nanoparticle, wherein the metal nanoparticle includes a core including a metal oxide and a ligand bonded the core. The ligand includes an acidic functional group, a basic functional group, or an ultraviolet-reactive functional group.

Provided are organometallic compounds comprising one central metal atom and at least one at least bidentate ligand comprising at least two moieties which are independently a monocyclic ring or a polycyclic fused ring system, wherein the monocyclic ring or each ring of the polycyclic fused ring system is independently a 5-membered to 10-membered carbocyclic or heterocyclic ring. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organometallic compounds.

The present invention relates to a composition for an organic electroluminescent element and an organic electroluminescent element comprising the same. The composition for an organic electroluminescent element comprises: a first host represented by chemical formula 1; and a second host represented by chemical formula 2, and the details of chemical formulae 1 and 2 are as defined in the specification.

Provided are organometallic compounds comprising a central metal atom which is coordinated by an at least two-dentate ligand comprising at least two rings A and B which are connected by a direct bond as well as a further linking group so that a 7-10 membered ring to which rings A and B are fused is formed. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) as well as related consumer products that utilize these organometallic compounds.