The present invention relates to a novel stable benzo[h]hexaphene compound and an organic light-emitting device including the compound. The present invention provides a benzo[h]hexaphene shown in claim 1.

The present invention provides a novel stable benzo[a]naphtho[2,1-c]tetracene compound and an organic light-emitting device including the compound. Provided is an organic compound represented by Formula [1]. ##STR00001##
In Formula [1], R.sub.1 to R.sub.16 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, a cyano group, a diphenylamino group, a pyridyl group, and an aryl group.

The present invention provides a novel stable benzo[a]naphtho[2,1-c]tetracene compound and an organic light-emitting device including the compound. Provided is an organic compound represented by Formula [1]. ##STR00001##
In Formula [1], R.sub.1 to R.sub.16 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms, a cyano group, a diphenylamino group, a pyridyl group, and an aryl group.

A compound represented by a formula (1C-A) below.

##STR00001##

One of R.sub.4 to R.sub.8 and R.sub.10 to R.sub.12 is a group represented by a formula (1D-A) above; R.sub.1 to R.sub.3, R.sub.9, and R.sub.4 to R.sub.8 and R.sub.10 to R.sub.12 not being the group represented by the formula (1D-A) are each a hydrogen atom, a substituent, or the like; at least one of R.sub.21 to R.sub.30 is other than a hydrogen atom; when R.sub.11 is a group represented by a formula (1D), R.sub.12 is a hydrogen atom or a phenyl group; when R.sub.12 is a group represented by the formula (1D), R.sub.11 is a hydrogen atom or a phenyl group; in the formula (1D), one of R.sub.21 to R.sub.30 represents a bonding position to a benz[a]anthracene ring in the formula (1C), and R.sub.21 to R.sub.30 not being the bonding position are each a hydrogen atom, a substituent, or the like.

A compound represented by a formula (1C-A) below.

##STR00001##

One of R.sub.4 to R.sub.8 and R.sub.10 to R.sub.12 is a group represented by a formula (1D-A) above; R.sub.1 to R.sub.3, R.sub.9, and R.sub.4 to R.sub.8 and R.sub.10 to R.sub.12 not being the group represented by the formula (1D-A) are each a hydrogen atom, a substituent, or the like; at least one of R.sub.21 to R.sub.30 is other than a hydrogen atom; when R.sub.11 is a group represented by a formula (1D), R.sub.12 is a hydrogen atom or a phenyl group; when R.sub.12 is a group represented by the formula (1D), R.sub.11 is a hydrogen atom or a phenyl group; in the formula (1D), one of R.sub.21 to R.sub.30 represents a bonding position to a benz[a]anthracene ring in the formula (1C), and R.sub.21 to R.sub.30 not being the bonding position are each a hydrogen atom, a substituent, or the like.

An organic electroluminescence device includes an anode, a cathode, and an emitting region disposed between the anode and the cathode, in which the emitting region includes a first emitting layer and a second emitting layer, the first emitting layer contains a first compound represented by a formula below, and the second emitting layer contains a second compound.

##STR00001##

At least one of R.sub.101 to R.sub.112 in the formula (100A), L.sub.101 or Ar.sub.101 in the formula (100B) has at least one deuterium atom. When only L.sub.101 has at least one deuterium atom, the at least one deuterium atom is bonded to a ring that is of rings forming L.sub.1 and directly bonded to a benz[a]anthracene ring in the formula (100A).

A compound is represented by a formula (1A-A). One of R.sub.4 to R.sub.8 and R.sub.10 to R.sub.12 is a group represented by a formula (1B-A1), (1B-A2), or (1B-A3) above; R.sub.1 to R.sub.3, R.sub.9, and R.sub.4 to R.sub.8 and R.sub.10 to R.sub.12 other than the above are each a hydrogen atom, a substituent, or the like; when R.sub.11 or R.sub.12 is a group represented by the formula (1B-A1), (1B-A2), or (1B-A3), R.sub.12 or R.sub.11 is a hydrogen atom or a phenyl group; and in the formulae (1B-A1) to (1B-A3), R.sub.51 to R.sub.57, R.sub.61 to R.sub.64, R.sub.71 to R.sub.74, and R.sub.81 to R.sub.84 forming no ring in the formulae (1B-A1) to (1B-A3) are each a hydrogen atom, a substituent, or the like; and * represents a bonding position to a benz[a]anthracene ring in the formula (1A-A).

##STR00001##

Provided are graphene nanoribbons with controlled zig-zag edge and cove edge configuration and methods for preparing such graphene nanoribbons. The nanoribbons are selected from the following formulae.

##STR00001##

The present invention relates to a process for preparing single wall carbon nanotubes (SWCNT) having a diameter d.sub.SWCNT, which comprises (i) providing a precursor element which comprises a segment S.sub.SWCNT of the single wall carbon nanotube, the segment S.sub.SWCNT being made of at least one ring formed by ortho-fused benzene rings, and having a first end E1 which is open and a second end E2 which is opposite to the first end E1, (ii) growing the precursor element by vapour phase reaction with a carbon-source compound on the surface of a metal-containing catalyst, wherein the precursor element is in contact with the surface of the metal-containing catalyst via the open end E1 of the segment S.sub.SWCNT, and the metal-containing catalyst is in the form of particles having an average diameter d.sub.cat satisfying the following relation: d.sub.cat>2d.sub.SWCNT or in the form of a continuous film.

The present invention relates to a process for preparing single wall carbon nanotubes (SWCNT) having a diameter d.sub.SWCNT, which comprises (i) providing a precursor element which comprises a segment S.sub.SWCNT of the single wall carbon nanotube, the segment S.sub.SWCNT being made of at least one ring formed by ortho-fused benzene rings, and having a first end E1 which is open and a second end E2 which is opposite to the first end E1, (ii) growing the precursor element by vapour phase reaction with a carbon-source compound on the surface of a metal-containing catalyst, wherein the precursor element is in contact with the surface of the metal-containing catalyst via the open end E1 of the segment S.sub.SWCNT, and the metal-containing catalyst is in the form of particles having an average diameter d.sub.cat satisfying the following relation: d.sub.cat>2d.sub.SWCNT or in the form of a continuous film.