The present invention provides a novel polymer comprising a repeating unit represented by the following Chemical Formula 1, and an organic light emitting device including the same:

##STR00001##

Wherein L.sub.1, L.sub.2, Ar.sub.1, Ar.sub.2, Ar.sub.3, R.sub.1 to R.sub.8, o, p and n are described herein.

A light-emitting device having a high current efficiency is provided. The light-emitting device includes, in sequence, a cathode, an electron transport layer, a light-emitting layer, and an anode. The light-emitting device further optionally includes an electron injection layer between the cathode and the electron transport layer. The electron transport layer contains particles and a non-particle electron transport material. A refractive index of light n1 at a wavelength of 550 nm of a material that constitutes the particles and a refractive index of light n2 at a wavelength of 550 nm of the non-particle electron transport material satisfies the following relation: n1n20.15. The particles have a Z-average size of 110 to 300 nm as determined by dynamic light scattering.

A light emitting device having excellent luminance life contains an anode, a cathode, a first organic layer disposed between the anode and the cathode and a second organic layer disposed between the anode and the cathode. The first organic layer contains a compound represented by the formula (C-1), and the second organic layer contains a compound represented by the formula (C-1) and a cross-linked body of a crosslinkable material.

##STR00001##

Ring R.sup.1C and Ring R.sup.2C represent an aromatic hydrocarbon ring or an aromatic hetero ring and R.sup.C represents an oxygen atom, a sulfur atom or a group represented by the formula (C-1).

##STR00002##

Ring R.sup.3C and Ring R.sup.4C represent an aromatic hydrocarbon ring or an aromatic hetero ring and R.sup.C represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.

Provided are a polymer containing S,S-dioxide-dibenzothiophene in backbone chain with content-adjustable triarylamine end groups, and a preparation method and an application thereof. Triarylamines hole-transport small molecules are introduced into the polymer end group, and a content of the triarylamine end groups can be adjusted by controlling a polymer molecular weight, so that the polymer has better electron-transport and hole-transport capabilities, and charge carrier transport can be balanced, so that more exciton recombination takes place effectively, thus improving the luminous efficiency and stability of the polymer. The polymer is prepared by a Suzuki polymerization reaction and does not require synthesis of new monomers. The polymer material is used for preparing highly effective and stable monolayer devices, and is dissolved directly in an organic solvent, then spin-coated, ink-jet printed, or printed to form a film.

A charge transport material containing at least one charge transport polymer selected from the group consisting of a first charge transport polymer having one or more monovalent conjugated diene-containing groups, and a second charge transport polymer having one or more monovalent dienophile-containing groups.

An organic semiconductor element in which an organic semiconductor layer contains a compound of Formula (1) and/or a compound of Formula (2) or contains a polymer having a structure of any one of Formulae (9) and (10):

##STR00001## in which X.sup.1 represents a nitrogen atom or CR.sup.a, rings A to D each represent a specific aromatic ring or an aromatic heterocyclic ring; Y.sup.1 represents an oxygen atom, a sulfur atom, CR.sup.b.sub.2, or NR.sup.c; R.sup.a to R.sup.c each represent hydrogen atoms or substituents; R.sup.1 and R.sup.2 each represent a to specific substituent; n represents 1 or 2; and * represents a bonding site.

A material comprising an electron-accepting unit of formula (I): Ar is an aromatic ring; Ar.sup.1 is a substituted or unsubstituted 5- or 6-membered heteroaromatic ring containing N and C ring atoms; when Ar.sup.1 is a substituted or unsubstituted 6-membered heteroaromatic ring, Ar.sup.2 is a substituted or unsubstituted 6-membered heteroaromatic ring wherein the ring atoms are selected from N and C; when Ar.sup.1 is a 5-membered heteroaromatic ring, Ar.sup.2 is a substituted or unsubstituted 5- or 6-membered heteroaromatic ring; Ar.sup.3 is a 5-membered ring or a substituted or unsubstituted 6-membered ring; Ar.sup.4 is a 5-membered ring or a substituted or unsubstituted 6-membered ring or is absent; Ar.sup.5 is a substituted or unsubstituted monocyclic or polycyclic group containing at least one aromatic or heteroaromatic ring; Ar.sup.6 is a substituted or unsubstituted monocyclic or polycyclic group containing at least one aromatic or heteroaromatic ring or is absent; and each X is independently a substituent bound to a C atom of Ar.sup.3, and where present Ar.sup.4, with the proviso that at least one X is an electron withdrawing group; and wherein the material further comprises an electron-donating unit.

##STR00001##

The present disclosure provides for the development and applications of monomeric, oligomeric and/or polymeric semiconductor materials comprising a five-membered heteroaromatic unit (e.g., thiophene; furan; selenophene; etc.) that includes an acrylyl or an acrylyl-like (CCCO) side chain. The semiconductor materials can be used as organic semiconductors for use in electronic, optical, or optoelectronic devices such as organic thin film transistors and organic photovoltaics. The disclosed semiconductor materials (e.g., semiconducting polymer compounds) can be used as high performance semiconductors (e.g., for organic solar cells or organic photovoltaics (OPVs)), and the disclosed semiconductor materials can be used for other devices (e.g., organic thin film transistors (OTFTs) and sensors, etc.).

An arylamine-fluorene alternating copolymer having a structural unit (A) is represented by Chemical Formula (1): ##STR00001##
wherein Chemical Formula (1) is the same as described in the detailed description.

A copolymer having a structural unit represented by Chemical Formula 1 is provided. The copolymer may improve performance, e.g., luminous efficiency, of an electroluminescence device. ##STR00001## In Chemical Formula 1, the definition of each substituent is as described in the detailed description.