NOVELTY - Imidazole derivatives (A) are new.    USE - (A) are useful in organic electronic devices, preferably organic solar cell, organic light-emitting device, organophotoreceptor and organic transistor (all claimed).    ADVANTAGE - (A) have high thermal and electronic stability and exhibit various band-gaps and highest occupied molecular orbital and lowest occupied molecular orbital energy levels; can be used in organic solar cell in pure state or by mixing with an impurity by vacuum deposition or solution coating to improve its optical efficiency, thermal stability and durability. The organic electronic device has high efficiency and stability.    DETAILED DESCRIPTION - Imidazole derivatives (A) of formula (I), (II), (III) and (IV) are new.    A1 = -(L1)p1-(Y1)q1;    A2 = -(L2)p2-(Y2)q2;    A3 = -(L3)p3-(Y3)q3;    A4 = -(L4)p4-(Y4)q4;    p1-p4 = 0-10;    q1- q4 = 1-10;    L1-L4 = arylene, divalent arylamine, divalent triarylphosphine, divalent triarylphosphine oxide group, alkenylene, alkynylene, fluorenylene, carbazolylene, benzocarbazolylene, divalent aromatic or aliphatic cyclic ketone group, divalent aromatic or aliphatic heterocyclic group containing N, O and/or S, divalent condensed aromatic or heterocyclic group (all optionally substituted), direct bond or O, S, N (optionally substituted by alkyl or aryl);    Y1-Y4 = alkyl, cycloalkyl, alkoxy, aryloxy, alkylthioxy, arylthioxy, alkylsulfoxy, arylsulfoxy, alkenyl, silyl, boron containing group, alkylamino, aralkylamino, arylamino, heteroarylamino, arylphosphine, arylphosphine oxide, aryl, fluorenyl, carbazolyl, benzocarbazolyl, aromatic or aliphatic cyclic ketone group, aromatic or aliphatic cyclic imide, aromatic or aliphatic heterocyclyl containing N, O and/or S, condensed aromatic or heterocyclic group (all optionally substituted), H, deuterium, halo, CN, NO2, OH, ester group (-CO2R), carbonyl group (-COR), imide, amide, conjugated double bond containing group of formula (V) or imidazolyl (optionally substituted by (V)) ;    n = 0-4;    Rx, Ry, Rz = 1-20C alkyl, 1-20C alkoxy, aryl, heteroaryl (all optionally substituted), H, -CN, ester, -C(=O)-R, -C(=O)OR, F or fluoroalkyl;    Q2 = dicyanomethylene, cyano and ester containing groups of formula (VI), cyano and amide containing group of formula (VII), benzothiazole containing group of formula (VIII), benzimidazole containing group of formula (IX), benzoxazole containing group of formula (X) or (phenyl)(cyano)methylene group of formula (XI);    a, b, c, d = 0-4;    R, R', R'' = alkyl, cycloalkyl, alkoxy, alkenyl, aromatic or aliphatic heterocyclyl containing N, O and/or S, aryl (all optionally substituted), H, CN, ester, -C(=O)R''', -C(=O)-OR''', -F or fluoroalkyl;    R''' = R;    r, s, w = 0-2;    t, u, v = 0-3;    A3' = -(L3')p3'-(Y3')q3';    A3'' = -(L3'')p3''-(Y3'')q3'';    Aa = -(La')pa-(Ya)qa;    Ab = -(Lb)pb-(Yb')qb;    Ac' = -(Lc)pc-(Yc)qc;    Ad = -(Ld)pd-(Yd)qd;    Ae = -(Le)pe-(Ye)qe;    Af = -(Lf)pf-(Yf)qf;    p3', p3'', pa, pb, pc, pd, pe, pf = p1-p4;    q3', q3'', qa, qb, qc, qd, qe, qf = q1-q4;    L3', L3'', La', Lb, Lc, Ld, Le, Lf = L1-L4;    Y3', Y3'', Ya, Yb', Yc, Yd, Ye, Yf = Y1-Y4; and    Z = alkylene, cycloalkylene, arylene, fluorenylene, divalent aromatic or aliphatic cyclic ketone group, divalent heterocyclic group containing N, O and/or S (all optionally substituted), divalent condensed or non-condensed heterocyclic or aromatic group, O, S, N (optionally substituted) or direct bond.    Provided that: at least one of Y1-Y4 is (V); and at least one of Y3', Y3'', Ya, Yb', Yc, Yd, Ye and Yf is (V). An INDEPENDENT CLAIM is also included for organic electronic device comprising first electrode, second electrode, and at least one organic layer arranged between first and the second electrodes, where the organic layer comprises (A).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of organic solar cell.    Substrate (101)    First electrode (102)    Hole transport layer (103)    Photoactive layer (104)    Second electrode (105)