This invention relates to compounds containing heterocycles or azaheterocycles and phenylene or azaphenylene wherein at least one ring is a five-membered ring. These novel compounds are useful as host materials for phosphorescent electroluminescent devices.

Disclosed are a method for preparing a series of carbazole derivatives and use thereof in organic light-emitting diodes. The structure of the material is as shown in Formula I. An organic electroluminescent device prepared by the material can have a significantly improved power efficiency and an external quantum efficiency for the device and an extended life for an orange light or red light device; moreover, the material has characteristics, for example, methods for the synthesis and purification of the material are simple and suitable for large-scale production, and is an ideal choice as a luminescent material for organic electroluminescent devices. The use of the organic electroluminescent diode material as a carrier transport material or as a luminescent material alone or as a host material in a light-emitting layer also falls within the scope of protection.

##STR00001##

A compound of Chemical Formula 1 and an organic light emitting device including the same:

##STR00001##

wherein: Ar.sub.1 is unsubstituted benzophenanthrenyl, chrysenyl, or fluoranthenyl; Ar.sub.2 is a substituted or unsubstituted C.sub.6-60 aryl, or a substituted or unsubstituted C.sub.6-60 heteroaryl containing any one or more of N, O and S; L.sub.1, L.sub.2, and L.sub.3 each independently is a direct bond or a substituted or unsubstituted C.sub.6-60 arylene; and R.sub.1 and R.sub.2 are each independently hydrogen, deuterium, a substituted or unsubstituted C.sub.1-12 alkyl, or a substituted or unsubstituted C.sub.6-14 aryl. The compound of Chemical Formula 1 can be used as a material for an organic material layer of an organic light emitting device for hole injection, hole transport, hole injection and transport, electron blocking, light emission, electron transport, or electron injection, and can improve the efficiency, achieve low driving voltage and/or improve lifetime characteristics of the device.

Fluorene derivatives that are connected in one or more of the 1-, 1-, 4-, or 4-positions in any combination to a carbon atom of a diaryl substituted triazinyl or pyrimidinyl derivative. The fluorene derivatives are not spirobifluorene derivatives. The compounds are suitable for use in electronic devices, in particular organic electroluminescent devices, comprising these compounds. In some embodiments, the compounds are used as matrix materials for phosphorescent or fluorescent emitters as well as a hole-blocking or an electron-transport layer.

A compound of: ##STR00001##
is disclosed. In Formula III, ring B and ring C are each independently a 5 or 6-membered carbocyclic or heterocyclic ring; A-B represents a bonded pair of carbocyclic or heterocyclic rings coordinated to a metal M via a nitrogen atom in ring A and an sp.sup.2 hybridized atom in ring B; A-C represents a bonded pair of carbocyclic or heterocyclic rings; M is a metal having an atomic number greater than 40; L is a monoanionic bidentate ligand; m is the oxidation state of the metal M; and n is at least 1.

A phosphorescent emitter or delayed fluorescent and phosphorescent emitters represented by Formula 1 or Formula II, where M is platinum or palladium. ##STR00001##

A compound having a structure of Formula I: ##STR00001##
is provided. In the structure of Formula I, each one of X.sup.1 to X.sup.16 is independently CR.sup.X or N; each R.sup.X and R are independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, carbazole, azacarbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, triphenylene, azatriphenylene, and combinations thereof; and any adjacent R.sup.X can join to form fused or unfused rings. Formulations and devices, such as an OLEDs, that include the compound containing a structure of Formula I are also described.

Compounds comprising phosphorescent metal complexes comprising cyclometallated imidazo[1,2-f]phenanthridine and diimidazo[1,2-a:1,2-c]quinazoline ligands, or isoelectronic or benzannulated analogs thereof, are described. Organic light emitting diode devices comprising these compounds are also described.

Electronic or optoelectronic device comprising a first electrode, a second electro, and an active layer arranged between and in electrical connection with the first and the second electrode. The active layer comprises at least one dye compound, which comprises small-molecule organic solar cells.

The present invention relates to a novel compound and an organic electroluminescence device including the same, and the compound according to the present invention may be used in an organic material layer, preferably a light-emitting layer of an organic electroluminescence device, thereby enhancing the light-emitting efficiency, driving voltage, lifespan, and the like of the organic electroluminescence device.