NOVELTY - A heterocyclic derivative (I), is new.    USE - New heterocyclic derivative is used for mixture for composition used as electron transport material, hole injection material and hole blocking material for light-emitting layer for manufacturing optoelectronic component e.g. organic light-emitting device, light-emitting electrochemical cell, non-hermetically sealed organic light-emitting diode sensor, organic solar cell, organic field effect transistor, organic laser diode and downconversion element (all claimed).    ADVANTAGE - The mixture using the heterocyclic derivative (I) has excellent chemical and electrochemical stability and charge carrier mobility, and provides efficient optoelectronic component having excellent durability.    DETAILED DESCRIPTION - A heterocyclic derivative of formula (I), is new.    A=acceptor group with electron-withdrawing property, derived from compound (a1) chosen from pyridine, triazine, pyrimidine, P(=O)R12, P(=O)R1, P(=S)R12, P(=S)R1, P(=Se)R12, P(=Se)R1, benzimidazole, 1,2,4-oxadiazole, 1,2,4-triazole, or 1,2,3-triazole;    R1=H, halo, D, -NR22, -OR2, or linear, branched or cyclic alkyl, hetero alkyl, aryl, heteroaryl, alkenyl, alkynyl (all optionally substituted by halo, D or linear, branched or cyclic alkyl);    R2=H, D, or linear, branched or cyclic alkyl, hetero alkyl, aryl, heteroaryl, alkenyl, alkynyl (all optionally substituted by halo, D or linear, branched or cyclic alkyl);    D1=donor group with electron-donating property derived from divalent group-containing compound of formula (Ia);    D2=donor group with electron-donating property derived from heterocyclic compound of formula (Ib);    n,p=0-5;    0=1-5;    X=divalent group chosen from O, S, S=O, SO2, Se, Se=O, SeO2, C(R3)2, C=NR3, C=C(R3)2, Si(R3)2, N(R3), P(R3), P(=O)R3 or B(R3);    Y'=covalent single bond or divalent group chosen from O, S, S=O, SO2, Se, Se=O, SeO2, C(R3)2, C=NR3, C=C(R3)2, Si(R3)2, N(R3), P(R3), P(=O)R3 or B(R3);    R=H, D, halo, linear, branched or cyclic alkyl, branched or cyclic alkoxy, linear, branched or cyclic alkenyl, or 5-60C aryl or hetero aryl, 5-40C aryloxy or heteroaryloxy, or 5-40C aryl or heteroaryl (all optionally substituted by 1 or more R4), where two or more R combined to form mono- or polycyclic aliphatic ring or aryl;    R3,R4=H, D, OR5, SR5 or C(R5)3;and    R5=H, alkyl or aryl.    INDEPENDENT CLAIMS are included for the following:    (1) manufacture of heterocyclic derivative (I);    (2) mixture, which contains the heterocyclic derivative (I) and at least one luminescent emitter;    (3) composition, which containing the heterocyclic derivative (I) or the mixture, and at least one solvent; and    (4) manufacture of optoelectronic component, which involves using the heterocyclic derivative (I).