An organic compound that emits red light having a long wavelength is represented by formula (1). In formula (1), R.sub.1 to R.sub.24 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted aryloxy group, a silyl group, and a cyano group.

##STR00001##

An organic compound that emits red light having a long wavelength is represented by formula (1). In formula (1), R.sub.1 to R.sub.24 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted aryloxy group, a silyl group, and a cyano group.

##STR00001##

The invention relates to compounds with benzindenofluorene base bodies having a structure of formula (I): ##STR00001##
and to the use thereof in electronic devices, in particular in organic electroluminescent devices.

The invention relates to compounds with benzindenofluorene base bodies having a structure of formula (I): ##STR00001##
and to the use thereof in electronic devices, in particular in organic electroluminescent devices.

The invention relates to bimesogenic compounds of formula I ##STR00001##
wherein R.sup.11, R.sup.12, MG.sup.11, MG.sup.12, X.sup.11, X.sup.12 and Sp.sup.1 have the meaning given in claim 1, to the use of bimesogenic compounds of formula l in liquid crystal media and particular to flexoelectric liquid crystal devices comprising a liquid crystal medium according to the present invention.

The invention relates to bimesogenic compounds of formula I ##STR00001##
wherein R.sup.11, R.sup.12, MG.sup.11, MG.sup.12, X.sup.11, X.sup.12 and Sp.sup.1 have the meaning given in claim 1, to the use of bimesogenic compounds of formula l in liquid crystal media and particular to flexoelectric liquid crystal devices comprising a liquid crystal medium according to the present invention.

The present disclosure provides a photoelectric conversion element including a lower electrode, a photoelectric conversion layer, and an upper electrode in this order, wherein the photoelectric conversion layer includes a first organic compound and a second organic compound having a lower reduction potential than that of the first organic compound, the first organic compound has an emission lifetime of 1.1 ns or more in chloroform solution, and the first organic compound is an organic compound represented by Formula [1] according to claim 1, a fluoranthene derivative, or a metal complex.

Embodiments of the disclosure relate to an organic light emitting element and a display device. Specifically, there may be provided an organic light emitting element including a compound represented by chemical formula 1 to provide excellent efficiency, long lifespan or low driving voltage and a display device including the organic light emitting element.

Embodiments of the disclosure relate to an organic light emitting element and a display device. Specifically, there may be provided an organic light emitting element including a compound represented by chemical formula 1 to provide excellent efficiency, long lifespan or low driving voltage and a display device including the organic light emitting element.

An organic electroluminescence device includes an anode, an emitting layer and a cathode. The emitting layer includes a first compound and a second compound. The first compound is a delayed fluorescent compound. The second compound is a fluorescent compound. A solution of the second compound in toluene has an emission peak wavelength in a range from 430 nm to 480 nm. A molar absorbance coefficient of the second compound at an absorption peak closest to a long-wavelength side is in a range from 29,000 L/(mol.Math.cm) to 1,000,000 L/(mol.Math.cm). The second compound has a Stokes shift in a range from 1 nm to 20 nm.