An organic compound represented by formula (1) and an organic compound represented by formula (2). These organic compounds provide high color purity. ##STR00001## In formulae (1) and (2), R.sub.1 to R.sub.24 are each independently selected from the group consisting of a hydrogen atom and a substituent.

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##

A composition includes: a compound including an aromatic hydrocarbon ring structure, and a partial structure represented by formula (1) which bonds to the aromatic hydrocarbon ring structure; and a solvent. The aromatic hydrocarbon ring structure has no fewer than 25 carbon atoms. In the formula (1), X represents a group represented by formula (i), (ii), (iii), or (iv); and *'s denote binding sites to two adjacent carbon atoms constituting the aromatic hydrocarbon ring structure. A method of producing a patterned substrate, includes applying the composition directly or indirectly on a substrate to form a resist underlayer film; forming a resist pattern directly or indirectly on the resist underlayer film; and carrying out etching using the resist pattern as a mask.

##STR00001##

A composition includes: a compound including an aromatic hydrocarbon ring structure, and a partial structure represented by formula (1) which bonds to the aromatic hydrocarbon ring structure; and a solvent. The aromatic hydrocarbon ring structure has no fewer than 25 carbon atoms. In the formula (1), X represents a group represented by formula (i), (ii), (iii), or (iv); and *'s denote binding sites to two adjacent carbon atoms constituting the aromatic hydrocarbon ring structure. A method of producing a patterned substrate, includes applying the composition directly or indirectly on a substrate to form a resist underlayer film; forming a resist pattern directly or indirectly on the resist underlayer film; and carrying out etching using the resist pattern as a mask.

##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. ##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. ##STR00001##

The present invention includes novel compounds containing heterocycles or azaheterocycles and fused phenylene or aza and cyano substituted variants thereof. These compounds may be useful as host materials for phosphorescent electroluminescent devices. In some embodiments, the invention includes compounds of Formula I: ##STR00001##

The present invention includes novel compounds containing heterocycles or azaheterocycles and fused phenylene or aza and cyano substituted variants thereof. These compounds may be useful as host materials for phosphorescent electroluminescent devices. In some embodiments, the invention includes compounds of Formula I: ##STR00001##

The present disclosure relates to display technologies, and particularly discloses an organic electroluminescent device. This organic electroluminescent device includes a light-emitting layer, the light-emitting includes an exciplex composed of a donor molecule and an acceptor molecule, and a wide band gap material for increasing the inter-molecular spacing between the donor molecule and the acceptor molecule. According to the device of the present disclosure, the degree of orbital overlap of HOMO and LUMO of the formed exciplex and the singlet-triplet energy level difference can be reduced, the reverse intersystem crossing rate (k.sub.RISC) of the exciplex host can be increased, the Föster energy transferred to the guest molecule can be enhanced, and the efficiency and the lifetime of the device can be improved.