NOVELTY - A 1,8-carbazole polymer prepared by subjecting carbazole monomer to Suzuki and Yamamoto condensation reaction is new.    USE - New 1,8-carbazole polymer useful as semiconductor material of cavity transmission layer or illuminating layer for illuminating diode (claimed), or as photoelectric material for organic electrofluorescence, organic field effect tube, organic solar cell, non-linear optics, biological sensor, organic photostorage and organic laser.    ADVANTAGE - The 1,8-carbazole monomer is convenient to produce and easy to obtain. The 1,8-carbazole polymer prepared from 1,8-carbazole monomer has non-linear framework structure, non-plane conformation, high thermal stability and glass transition temperature, and low cost. The electrofluorescence apparatus prepared with 1,8-carbazole polymer photoelectric material has satisfactory brightness and illuminating efficiency.    DETAILED DESCRIPTION - A 1,8-carbazole polymer of formula (I) is new.    a=1-10;    b=0-30;    n=1-300;    R1-R3=H; or straight, branched, or cyclic 1-22C alkyl; in which one or more C atoms that are not adjacent to each other may be substituted with -NR19-, -O-, -S-, -CO-O-, -O-CO-O, -CO-NR19-, -NR19-CO-NR19-, -O-CO-S-, -NR19-CO-O-, -CS-O-, -CS-NR19-, -O-CS-O-, -NR19-CS-NR20-, -O-CS-S-, -NR19-CS-O-, -CS-S-, or -SiR19R20-; or one or more H atoms may be substituted with F or CN;    R19, R20=H; straight, branched, or cyclic alkyl, alkoxy, alkyl sulfhydryl, or ester; or 2-40C olefin, aryl, and/or aryloxy; in which one or more C atoms may be substituted with O, S, N, or Si; and one or more H atoms may be substituted with non-aryl group R1 or with Cl, F, CN and N(R1)2;    Ar1=2-40C aryl including -CH=CH- (1), -CC- (2), groups of formulae (3)-(16), -AC3-N(AC2-AC1)- (17), or groups of formulae (18-20), in which one or more C atoms may be substituted with Si, Se, O, S, N, or S(O)2; and the hydrogen on one or more C atoms may be substituted with F or CN;    X, Y1, W1=CR19 or N;    Z, Z1, Z2=-O-, -S-, -Se-, -NR5-, S(O)2-, -CR19R20-, or -SiR19R20; and    AC1-AC4=aryl, preferably phenyl, thiofuran, pyrrole, furan, imidazole, thiazole, or pyridine, including derivative of aryl substituted and oxidized by alkyl or phenyl and Cl, F, CN, N(R)2.    An INDEPENDENT CLAIM is included for preparation of 1,8-carbazole polymer (I).