The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to organic electroluminescent devices which comprise these compounds.

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to organic electroluminescent devices which comprise these compounds.

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):

To improve the emission efficiency, the driving voltage and the lifetime of an organic light-emitting device using a delayed fluorescent material. A host material for a delayed fluorescent material, containing a compound represented by the following general formula: R.sup.1 to R.sup.5 each are a substituent not containing a cyano group. n1 to n5 each are 0 to 4, Ar is a monocyclic arylene group or a monocyclic heteroarylene group.

##STR00001##

A compound, an organic light-emitting device, and a flat display apparatus, the compound being represented by Formula 1, below: ##STR00001##

A compound, an organic light-emitting device, and a flat display apparatus, the compound being represented by Formula 1, below: ##STR00001##

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.

This application relates in part to an organic electroluminescent element including a substrate, a pair of electrodes including an anode and a cathode, disposed on the substrate, and an organic layer(s) including a light emitting layer, in which the organic layer(s) contains a compound represented by the following formula (1), in which R.sup.1 to R.sup.8 are each hydrogen or a substituent, at least one of R.sup.1 to R.sup.4 and at least one of R.sup.5 to R.sup.8 are each a substituent represented by the formula (2); R.sup.9 to R.sup.12, Z.sup.1 to Z.sup.4, Ar.sup.1, Ar.sup.2, and L.sup.1 are as defined herein. ##STR00001##

This application relates in part to an organic electroluminescent element including a substrate, a pair of electrodes including an anode and a cathode, disposed on the substrate, and an organic layer(s) including a light emitting layer, in which the organic layer(s) contains a compound represented by the following formula (1), in which R.sup.1 to R.sup.8 are each hydrogen or a substituent, at least one of R.sup.1 to R.sup.4 and at least one of R.sup.5 to R.sup.8 are each a substituent represented by the formula (2); R.sup.9 to R.sup.12, Z.sup.1 to Z.sup.4, Ar.sup.1, Ar.sup.2, and L.sup.1 are as defined herein. ##STR00001##