An organic semiconductor material having a chrysene skeleton by limiting a compound having particular transistor performance. The chrysene compound is represented by the following chemical formula: ##STR00001##
In the chemical formula, R2 and R8 are not the same functional group, and independently includes at least one of a hydrogen atom, a substituted or non-substituted aryl group, a substituted or non-substituted heterocyclic group and a substituted or non-substituted alkyl group.

An organic light-emitting material having the structure of formula (I) or (II) as described below and an organic light-emitting device (OLED) are disclosed. The OLED adopts the compound containing fluoranthene group as the electron transport material possessing good electron transport and injection ability. The material also enhances the luminous efficiency and lifetime of the device because of its excellent thermal stability and film-forming properties. At the same time, the high triplet energy and excellent electron transport capacity of the material containing fluoranthene group make it suitable to be used as the host for phosphorescent devices, increasing the number of electrons in the light-emitting layer and the efficiency of the device. ##STR00001##

An organic light-emitting material having the structure of formula (I) or (II) as described below and an organic light-emitting device (OLED) are disclosed. The OLED adopts the compound containing fluoranthene group as the electron transport material possessing good electron transport and injection ability. The material also enhances the luminous efficiency and lifetime of the device because of its excellent thermal stability and film-forming properties. At the same time, the high triplet energy and excellent electron transport capacity of the material containing fluoranthene group make it suitable to be used as the host for phosphorescent devices, increasing the number of electrons in the light-emitting layer and the efficiency of the device. ##STR00001##

An organic light-emitting medium including a pyrene derivative represented by the following formula (1) and a phenyl-substituted anthracene derivative represented by the following formula (2): ##STR00001##
wherein Ar.sup.1 to Ar.sup.4 are independently a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms.

An organic light-emitting medium including a pyrene derivative represented by the following formula (1) and a phenyl-substituted anthracene derivative represented by the following formula (2): ##STR00001##
wherein Ar.sup.1 to Ar.sup.4 are independently a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 20 ring atoms.

A compound is represented by a formula (1) below.

##STR00001##

In the formula (1): R.sub.a and R.sub.b not forming a ring are a substituent or the like; a combination of R.sub.5 and R.sub.6, combination of R.sub.6 and R.sub.7, or combination of R.sub.7 and R.sup.8 form a ring represented by a formula (10). In this case, positions a1 and b1, positions a2 and b1, or positions a3 and b1 are fused with each other. One or more of R.sub.1 to R.sub.4, R.sub.5 to R.sub.8 not forming a ring, and R.sub.9 to R.sub.12 are a substituent Rx. One or more of R.sub.4 to R.sub.6, R.sub.8, R.sub.9 and R.sub.12 not being Rx are a substituent Ry, and R.sub.1 to R.sub.12 other than Rx and Ry are a hydrogen atom or substituent. At least one hetero atom of when the substituent is a heterocyclic group only includes one or more of oxygen, sulfur and silicon.

A compound is represented by a formula (1) below.

##STR00001##

In the formula (1): R.sub.a and R.sub.b not forming a ring are a substituent or the like; a combination of R.sub.5 and R.sub.6, combination of R.sub.6 and R.sub.7, or combination of R.sub.7 and R.sup.8 form a ring represented by a formula (10). In this case, positions a1 and b1, positions a2 and b1, or positions a3 and b1 are fused with each other. One or more of R.sub.1 to R.sub.4, R.sub.5 to R.sub.8 not forming a ring, and R.sub.9 to R.sub.12 are a substituent Rx. One or more of R.sub.4 to R.sub.6, R.sub.8, R.sub.9 and R.sub.12 not being Rx are a substituent Ry, and R.sub.1 to R.sub.12 other than Rx and Ry are a hydrogen atom or substituent. At least one hetero atom of when the substituent is a heterocyclic group only includes one or more of oxygen, sulfur and silicon.

The present invention relates to a new transition metal compound based on cyclopenta[b]fluorenyl group, a transition metal catalyst composition containing the same and having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and one -olefin, a method of preparing an ethylene homopolymer or a copolymer of ethylene and -olefin using the same, and the prepared ethylene homopolymer or the copolymer of ethylene and -olefin.

The present invention relates to a new transition metal compound based on cyclopenta[b]fluorenyl group, a transition metal catalyst composition containing the same and having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and one -olefin, a method of preparing an ethylene homopolymer or a copolymer of ethylene and -olefin using the same, and the prepared ethylene homopolymer or the copolymer of ethylene and -olefin.

Provided is an organic light-emitting device capable of outputting light with high efficiency and high luminance. The organic light-emitting device includes an anode, a cathode, an emission layer placed between the anode and the cathode, and an organic compound layer placed between the anode and the emission layer, in which the organic compound layer contains the following compound A and compound B: [Compound A] an organic compound free of a nitrogen atom and a metal atom, the compound having SP.sup.2 carbon atoms and SP.sup.3 carbon atoms, and having a ratio of the number of the SP.sup.3 carbon atoms to the number of the SP.sup.2 carbon atoms of 40% or more; and [Compound B] a compound having a tertiary amine structure.