The present disclosure provides an organic semiconductor compound, which has superior charge mobility, low band gap, wide light absorption area and adequate molecular energy level. The conductive organic semiconductor compound of the present disclosure can be used as a material for various organic optoelectric devices such as an organic photodiode (OPD), an organic light-emitting diode (OLED), an organic thin-film transistor (OTFT), an organic solar cell, etc. In addition, it can be prepared into a thin film via a solution process, can be advantageously used to fabricate large-area devices and can reduce the cost of device fabrication.

A polymer comprising one or more optionally substituted repeat units of formula (I):

##STR00001##

wherein each Ar.sup.1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar.sup.2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R.sup.1 and R.sup.2 are substituents wherein R.sup.1 and R.sup.2 are different.

A polymer comprising one or more optionally substituted repeat units of formula (I): (I) wherein each Ar.sup.1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar.sup.2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R.sup.1 and R.sup.2 are substituents wherein R.sup.1 and R.sup.2 are different. ##STR00001##

Composition which may be useful in an organic light emitting diode, the composition having a fluorescent light-emitting polymer with light-emitting repeat units, and a triplet-accepting unit mixed with the light-emitting polymer.

A polymer compound comprising a structural unit represented by the formula (1):

##STR00001##

wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently represent an alkyl group, an aryl group or a monovalent heterocyclic group, and these groups optionally have a substituent, two rings A may be the same or different, and represent a thiophene ring, a benzothiophene ring or a thienothiophene ring, n represents 1 or 2, and X represents a halogen atom, an alkyl group, an alkoxy group, an alkylthio group, an amino group, an aryl group, a monovalent heterocyclic group, an alkenyl group or an alkynyl group, and these groups optionally have a substituent, and when n is 2, two groups X may be the same or different.

In one aspect, electrically conductive conjugated polymeric compositions are described herein demonstrating compatibility with aqueous solvents and/or phases. The ability to provide aqueous compatible compositions from previously water insoluble conjugated polymeric systems, in some embodiments, can facilitate use of such systems in a variety of aqueous applications, including biological applications.

A photoelectric conversion device comprising a layer A having a hue value of h.sub.1 in the L*C*h color system calculated from the transmittance spectrum and a layer B having a hue value of h.sub.2 in the L*C*h color system calculated from the transmittance spectrum, wherein the above-described h.sub.1 and the above-described h.sub.2 satisfy h.sub.1+100h.sub.2h.sub.1+260.

Methods of metal-catalysed polymerisation are described using a metal catalyst of formula (III):

##STR00001##

wherein R.sup.3 in each occurrence is independently selected from C.sub.1-10 alkyl and aryl that may be unsubstituted or substituted with one or more substituents; y is 0 or 2; and Z.sup.is an anion. Methods described include Buchwald-type and Suzuki-type polymerisation.

A polymer blend including a first polymer having a unit represented by Formula 1 and a second polymer having a unit represented by Formula 2: ##STR00001## wherein in Formulae 1 and 2, R.sub.1 through R.sub.13, l, and m are the same as defined in the detailed description.

A composition comprising: a light emitting material; and a polymer compound having a constitutional sequence represented by the following formula (1) as a main chain:
-[(Y).sub.nZ].sub.m-(1) in the formula, Y represents a divalent group, in which two hydrogen atoms are removed from a structure represented by the following formula (Y-1) or (Y-2), Z represents a divalent group, in which two hydrogen atoms are removed from a structure represented by the following formula (Z-1), (Z-2), (Z-3), (Z-4), (Z-5), (Z-6), (Z-7), or (Z-8), m represents an integer of 4 to 10,000, and n represents an integer of 1 to 3.