A compound represented by the following formula (1) (wherein the symbols are as defined in the description), an organic electroluminescent device containing the compound, and an electronic device including the organic electroluminescent device.

##STR00001##

Provided is an organic light-emitting device including an anode; a cathode; a light-emitting layer between the anode and the cathode and including a compound of Chemical Formula 2:

##STR00001## a first organic material layer between the anode and the light-emitting layer and including a compound of Chemical Formula 1:

##STR00002## and a second organic material layer between the light-emitting layer and the cathode and including a compound of Chemical Formula 3:

##STR00003## wherein: Ar101, Ar102 and R101 to R108 are each independently hydrogen, deuterium, or a substituted or unsubstituted alkyl or aryl group; Ar1 and Ar2 are each independently hydrogen, deuterium, a halogen, a cyano, or a substituted or unsubstituted silyl, alkyl, cycloalkyl, or aryl group; R201 to R204 are each independently hydrogen, deuterium, a halogen, a cyano, or a substituted or unsubstituted alkyl, cycloalkyl, aryl group, or heterocyclic group; and Z is O or S.

Provided is an organic light-emitting device including an anode; a cathode; a light-emitting layer between the anode and the cathode and including a compound of Chemical Formula 2:

##STR00001## a first organic material layer between the anode and the light-emitting layer and including a compound of Chemical Formula 1:

##STR00002## and a second organic material layer between the light-emitting layer and the cathode and including a compound of Chemical Formula 3:

##STR00003## wherein: Ar101, Ar102 and R101 to R108 are each independently hydrogen, deuterium, or a substituted or unsubstituted alkyl or aryl group; Ar1 and Ar2 are each independently hydrogen, deuterium, a halogen, a cyano, or a substituted or unsubstituted silyl, alkyl, cycloalkyl, or aryl group; R201 to R204 are each independently hydrogen, deuterium, a halogen, a cyano, or a substituted or unsubstituted alkyl, cycloalkyl, aryl group, or heterocyclic group; and Z is O or S.

Provided are a novel compound capable of improving the luminous efficiency, stability and lifespan of a device, an organic electronic element using the same, and an electronic device thereof.

Provided are a novel compound capable of improving the luminous efficiency, stability and lifespan of a device, an organic electronic element using the same, and an electronic device thereof.

The present disclosure relates to a plurality of host materials, an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound according to the present disclosure or by comprising a specific combination of compounds according to the present disclosure as a plurality of host materials, it is possible to produce an organic electroluminescent device having improved driving voltage, luminous efficiency, and/or lifetime properties compared to the conventional organic electroluminescent devices.

Provided are a compound for an organic optoelectronic device represented by Chemical Formula 1, a composition for an organic optoelectronic device, an organic optoelectronic device including the same, and a display device. Details for Chemical Formula 1 are as defined in the specification.

The present invention relates to a composition, comprising a palladium compound which is a palladium salt or a palladium complex or a mixture thereof, and a polycyclic compound of Formula (I), (II) or (III):

Provided is an electroluminescent device. The organic electroluminescent device comprises a first metal complex comprising a ligand L.sub.a having a structure of Formula 1, a first compound having a structure of Formula 2 and a second compound having a structure of Formula 3. Compared to the related art, such a compound composition can significantly improve the performance of the organic electroluminescent device, especially significantly extend a device lifetime, and finally significantly improve the overall performance of the device. Further provided are an electronic device comprising the electroluminescent device and a compound composition comprising the first metal complex, the first compound and the second compound.

Provided is an electroluminescent device. The organic electroluminescent device comprises a first metal complex comprising a ligand L.sub.a having a structure of Formula 1, a first compound having a structure of Formula 2 and a second compound having a structure of Formula 3. Compared to the related art, such a compound composition can significantly improve the performance of the organic electroluminescent device, especially significantly extend a device lifetime, and finally significantly improve the overall performance of the device. Further provided are an electronic device comprising the electroluminescent device and a compound composition comprising the first metal complex, the first compound and the second compound.