NOVELTY - Substituted (hetero)aryl compounds (I) are new.    USE - (I) are useful in an emission layer, an electron-transport layer or a hole blocking layer of an electronic device, preferably organic electroluminescent device such as organic LED and organic light-emitting electrochemical cell, organic integrated circuits, organic field-effect transistors, organic thin-film transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic light-emitting transistors, organic field-quench devices and organic laser diodes. The electronic device is useful in medical field for phototherapy of the skin, cosmetics and displays and for lighting purposes (all claimed).    ADVANTAGE - (I) exhibit a relative low sublimation temperature, a high temperature and oxidation stability and excellent processability, and can be decomposed without any residue. (I) provide organic electroluminescent device with improved luminescent property, enhanced performance data in relation to compounds from the prior art, high efficiencies, low operating voltages and long service-life.    DETAILED DESCRIPTION - Substituted (hetero)aryl compounds of formula (I) are new.    Ring A, ring A1 = 5 or 6 membered (hetero)aryl ring optionally substituted with one or more R1;    ETG = an organic electron-transporting group from electron-deficient heteroaryl groups, where ETG is 5-60 membered heteroaryl ring containing N as heteroatom group, preferably triazines, pyrimidines, pyrazines, imidazoles, benzimidazoles or pyridines (all optionally substituted with R1);    Z = a single bond or a divalent group (preferably phenylene), when Z is a single bond, then the ETG binds directly to the carbon atom of the ring A;    V1 = a single bond, C=O, C(R1)2, NAr3, O (preferred), S, Si(R1)2, BR1, PR1, P(=O)R1, SO or SO2, where in the case of a single bond, the carbon atoms of the rings A and A1 are directly connected each other by a single bond;    W1 = a single bond, C=O, C(R1)2, NR1, O (preferred), S, Si(R1)2, BR1, PR1, P(=O)R1, SO or SO2, where in the case of a single bond, the carbon atoms of the rings A and A1 are directly connected each other by a single bond;    m, n = 0 or 1;    Ar3 = aryl ring or 6-30 membered ring (both optionally substituted by R2 or R3, where two or more R2 together forms a ring closure;    R1 = linear 1-40C-alkyl, linear 1-40C-alkoxy, linear 1-40C-thioalkoxy, linear 2-40C-alkenyl, linear 2-40C-alkynyl, branched or cyclic 3-40C-alkyl, branched or cyclic 3-40C-alkenyl, branched or cyclic 3-40C-alkynyl, branched or cyclic 3-40C-alkoxy, branched or cyclic 3-40C-alkylalkoxy, branched or cyclic 3-40C-thioalkoxy (all optionally substituted by R2, where one or more non-adjacent CH2 groups are replaced b R2C=CR2, CC, Si(R2)2, Ge(R2)2, Sn(R2)2, C=O, C=S, C=Se, C=NR2, P(=O)(R2), SO, SO2, NR2, O, S or CONR2 and one or more H atoms are replaced by D, F, Cl, Br, I, CN or NO2), 5-60 membered (hetero)aryl, (hetero)aryloxy or arylalkoxy ring (optionally substituted by R2), 10-40 membered diarylamino, diheteroarylamino or arylheteroarylamino ring (optionally substituted by R2), a combination of two or more of the above groups, a crosslinkable group Q, H, D, F, Cl, Br, I, N(R2)2, CN, NO2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2 or OSO2R2;    R2 = linear 1-40C-alkyl, linear 1-40C-alkoxy, linear 1-40C-thioalkoxy, linear 2-40C-alkenyl, linear 2-40C-alkynyl, branched or cyclic 3-40C-alkyl, branched or cyclic 3-40C-alkenyl, branched or cyclic 3-40C-alkynyl, branched or cyclic 3-40C-alkoxy, branched or cyclic 3-40C-alkylalkoxy, branched or cyclic 3-40C-thioalkoxy (all optionally substituted by R3, where one or more non-adjacent CH2 groups are optionally replaced by R3C=CR3, CC, Si(R3)2, Ge(R3)2, Sn(R3)2, C=O, C=S, C=Se, C=NR3, P(=O)(R3), SO, SO2, NR3, O, S or CONR3 and one or more H atoms are replaced by D, F, Cl, Br, I, CN or NO2)), 5-60 membered (hetero)aryl, (hetero)aryloxy or arylalkoxy ring (optionally substituted by R3), 10-40 membered diarylamino, diheteroarylamino or arylheteroarylamino ring (optionally substituted by R3), H, D, F, Cl, Br, I, N(R3)2, CN, NO2, Si(R3)3, B(OR3)2, C(=O)R3, P(=O)(R3)2, S(=O)R3, S(=O)2R3, OSO2R3, or a combination of two or more of the above groups, where the two or more of adjacent R3 optionally forms a mono- or polycyclic, aliphatic or aryl ring;    R3 = H, D, F or an aliphatic and/or (hetero)aryl 1-20C-hydrocarbyl, in which one or more H is optionally replaced by F; and    R4 = aryl ring, 6-60 membered ring system, 10-40 membered arylamino (all optionally substituted by R2), or a combination of two or more of the above groups, where two or more of adjacent R4 optionally forms a mono- or polycyclic, aliphatic or aryl ring.    INDEPENDENT CLAIMS are included for:    (1) the preparation of (I);    (2) a composition comprising (I) and at least one further compound comprising fluorescent emitters, phosphorescent emitters, host materials, matrix materials, electron transport materials, electron-injection materials, hole-conductor materials, hole-injection materials, electron-blocking materials and hole-blocking materials;    (3) a formulation comprising (I) and at least one solvent;    (4) an electronic device comprising (I) preferably in an emission layer, an electron-transport layer or a hole blocking layer; and    (5) manufacturing the electronic device by applying at least one organic layer by vapor deposition process or from a solution.