NOVELTY - Removable group-containing anthracene unit based donor-acceptor type organic semiconductor material i.e. anthracene-(hetero)aryl polymer (I) is new.    USE - (I) is useful as active layer and interface layer in organic electroluminescent device, organic photovoltaic device, organic field-effect transistors and other optoelectronic devices.    ADVANTAGE - (I): has good workability in solution; maintains close and ordered molecular packing in solid state; and has high charge transporting ability.    DETAILED DESCRIPTION - Removable group-containing anthracene unit based donor-acceptor type organic semiconductor material i.e. anthracene-(hetero)aryl polymer of formula (I) is new.    Ar = carbon-carbon double bond, carbon-oxygen double bond, sulfur-oxygen double bond or carbon-nitrogen bond electron-deficient conjugated unit-containing aromatic ring derivatives, which are benzothiadiazole, benzotriazole, naphthothiadiazole, naphthotriazole, pyrrolo-pyrrol-dione, indigo, isoindigo, quinoxaline, naphthalene-diimide, perylene-diimide, thienoimide or quinoxaline, preferably aromatic groups of formulae (a1)-(a26), Eg: (a1)-(a3), (1,2,5)thiadiazolo(3,4-c)pyridin-4,7-diyl, thiazolo(5,4-d)thiazol-2,5-diyl, 1,2,4,5-tetrazin-3,6-diyl, 4',4''-(4-(2-(5-(2,2-dicyanovinyl)thiophen-2-yl)vinyl)phenylazanediyl)diphenyl, 4',4''-(4-(2-(5-((1,3-diethyl-4,6-dioxo-2-thioxotetrahydropyrimidin-5(6H)-ylidene)methyl)thiophen-2-yl)vinyl)phenylazanediyl)diphenyl or 4',4''-(4-((E)-2-(5-((Z)-(1-(dicyanomethylene)-3-oxo-1H-inden-2(3H)-ylidene)methyl)thiophen-2-yl)vinyl)phenylazanediyl)diphenyl;    Ar' = carbon-carbon double bond or carbon-nitrogen bond conjugated unit-containing (hetero)aryl groups, which are benzene, naphthalene, thiophene, selenophene, tellurophene, furan, pyrrole or silole, preferably (hetero)aryl groups of formulae (b1)-(b14), Eg: (b1)-(b3), 3,4-oxadiazol-2,5-diyl, 1,3,4-thiadiazol-2,5-diyl, 1,3,4-selenadiazol-2,5-diyl, 1,3,4-telluradiazol-2,5-diyl or thiazolo(5,4-d)thiazol-2,5-diyl;    G = structural units formed after Diels-Alder cycloaddition reaction of anthracene with a dienophile, preferably structural units of formulae (c1)-(c3), carbonyl-diyl, oxalyl, 2,3,4,5-tetrachlorobenzen-1,6-diyl, 2,3,4,5-tetrabromobenzen-1,6-diyl, 2,3,4,5-tetrafluorobenzen-1,6-diyl or 2,3,4,5-tetranitrobenzen-1,6-diyl;    x, y = more than 0 and less than 1;    x+y = 1;    m, n = 1-10000;    dienophile = maleic anhydride, maleimide-based compound, azo-dicarboxylate or thione;    R = alkyl chain (at least one carbon atom of alkyl chain is replaced with an oxygen atom or substituted with alkenyl, alkynyl, aryl, carbonyl group, OH, amino, carboxy, cyano or nitro), H, fluoro, chloro, bromo or iodo; and    R' = alkyl or aryl.    An INDEPENDENT CLAIM is also included for preparation of (I).