Novel phosphorescent metal complexes containing 2-phenylisoquinoline ligands with at least two substituents on the isoquinoline ring are provided. The disclosed compounds have low sublimation temperatures that allow for ease of purification and fabrication into a variety of OLED devices.

Iridium complexes comprising three different bidentate ligands and their use in OLEDs to enhance the device efficiency and lifetime are disclosed. The complexes have a structure of the formula Ir(L.sub.A)(L.sub.B)(L.sub.C), where ligand L.sub.A is selected from a variety of structures, ligand L.sub.B has the structure ##STR00001##
and L.sub.C has the structure ##STR00002##
In these structures, rings A, B, C, and D are each independently a 5 or 6-membered carbocyclic or heterocyclic ring; R.sup.1, R.sup.2, R.sup.3, R.sup.A, R.sup.B, R.sup.C, and R.sup.D can be any of a variety of substituents, and Z.sup.1 and Z.sup.2 are each independently C or N.

A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and a light emitting area disposed between the first electrode and the second electrode and including a phosphorescent dopant, a hole transporting host, and an electron transporting host, wherein the light emitting area includes at least one auxiliary light emitting layer including a thermally activated delayed fluorescence dopant, the hole transporting host, and the electron transporting host and spaced apart from the first electrode and the second electrode.

The present disclosure provides an organic electroluminescent device including: an anode; a cathode; and one or more organic material layers interposed between the anode and cathode and selected from the group consisting of a hole injection layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injection layer, and further including a lifetime enhancement layer (LEL) between the light emitting layer and the electron transporting layer.

A composition including a first compound capable of functioning as a phosphorescent emitter in an OLED is provided. The first compound has at least one aromatic ring and at least one substituent R directly bonded to one of the at least one aromatic rings. Each substituent R has the formula of ##STR00001##
where (a) G.sup.1 is selected from NR.sup.1, SiR.sup.1R.sup.2, GeR.sup.1R.sup.2, alkyl, cycloalkyl, and combinations thereof; and G.sup.2 is a non-aromatic polycyclic group; (b) G.sup.1 is a direct bond; and G.sup.2 is a non-aromatic spiro polycyclic group; or (c) G.sup.1 is selected from direct bond, NR.sup.1, SiR.sup.1R.sup.2, GeR.sup.1R.sup.2, alkyl, cycloalkyl, and combinations thereof; G.sup.2 is a non-aromatic polycyclic group; and R is directly bonded to a phenyl, pyridine, or triazine. R.sup.1, R.sup.2, and R.sup.3 are a variety of substituents. Formulations and devices, such as an OLEDs, that include the first compound are also described.

The invention relates to a composition comprising an electron-transporting host and a hole-transporting host, to the use thereof in electronic devices and to electronic devices containing said composition. The electron-transporting host is most preferably selected from the class of triazine-dibenzofurane-fluorenyl systems or from the class of triazine-dibenzothiophene-fluorenyl systems. The hole-transporting host is preferably selected from the class of biscarbazoles.

A compound having the formula Ir(L.sub.A).sub.n(L.sub.B).sub.3-n is disclosed wherein L.sub.A is an aza-DBF ligand and L.sub.B is an alkyl-substituted phenylpyridine ligand, wherein the compound has a structure according to Formula I:

##STR00001##

wherein each of A.sup.1 to A.sup.8 comprise carbon or nitrogen; wherein at least one of A.sup.1 to A.sup.8 is nitrogen; wherein ring B is bonded to ring A through a C—C bond; wherein the iridium is bonded to ring A through a Ir—C bond; wherein X is O, S, or Se; wherein R′ and R″ each independently represent mono-, di-substitution, or no substitution; wherein any adjacent substitutions in R′, R″, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.6 are optionally linked together to form a ring; wherein R.sup.1, R.sup.2, R′, and R″ are each independently selected from a variety of substituents; wherein R.sup.3, R.sup.4, R.sup.5, and R.sup.6 are each independently selected from the group consisting of hydrogen, deuterium, alkyl, cycloalkyl, and combinations thereof; wherein n is an integer from 1 to 3; and wherein total number of carbons in at least one of the pairs R.sup.3 and R.sup.4, and R.sup.5 and R.sup.6 is at least four.

The invention relates to ligands and complexes of metal ions with the ligands useful in various applications, including therapeutic and diagnostic applications.

The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By using the organic electroluminescent compound of the present disclosure, an organic electroluminescent device having high luminous efficiency and/or long lifespan properties can be provided compared to conventional organic electroluminescent devices.

The present invention relates to spiro compounds containing electron-conducting groups and to electronic devices, in particular organic electroluminescent devices, comprising these compounds.