NOVELTY - Electronic device comprises at least one aryl compound (Q).    USE - (Q) is useful: in electronic devices, which are organic-LED, organic integrated circuit, organic field-effect transistor, organic thin-film transistor, organic light-emitting transistor, organic solar cell, organic optical detectors, organic photoreceptors, organic field-quench devices, light emitting electrochemical cells, organic laser diodes or organic plasmon emitting devices; as matrix material for fluorescence or phosphorescence emitter (preferred), hole block material in hole block layer, electron transport material in electron transport layer and/or electron injection layer, electron block layer and/or exciton block material in electron block and/or exciton block layer, and hole transport material in hole transport layer and/or hole injection layer, where the phosphorescence emitter contains iridium, palladium (both preferred), copper, molybdenum, tungsten, rhenium, ruthenium, osmium, rhodium, platinum, silver, gold or europium (all claimed).    ADVANTAGE - (Q) provides the electronic device with high thermal stability, high efficiency and to steep current-voltage curves with low threshold voltage.    DETAILED DESCRIPTION - Electronic device comprises at least one aryl compound (Q) of formula (I) or (XXXIX).    Either A-B1, D-E = an aryl unit of formula (II)-(V) or -C(R1)=C(R2)-; and    Z = NR2, O or S; or    A-Z, B1-Z = a nitrogen unit of formula (VII), in which q is 0;    Y1 = P(=O), P(=S), P, As(=O), As(=S), As, Sb(=O), Sb(=S), Sb, Bi(=O), Bi(=S) or Bi;    Ar1 = an aryl or heteroaryl ring system with 5-60 aromatic ring atoms, which is optionally substituted by at least one R1;    Ar2 = an aryl- or heteroaryl with 5-18 aromatic ring atoms, which is optionally substituted by at least one R1;    X = CR1 or N;    L = a single bond or a bivalent, trivalent or tetravalent group; either    R1 = H, D, F, Cl, Br, I, CN, NO2, N(R3)2, C(=O)R3, 1-40C-alkyl, 1-40C-alkoxy or 1-40C-thioalkyl, cyclic 3-40C-alkyl, 3-40C-alkoxy, 3-40C-thioalkyl, 2-40C-alkenyl, 2-40C-alkynyl (which is optionally substituted by at least one R3, where one or more non-adjacent CH2 group is optionally substituted by R3C=CR3, C?=C, 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 optionally substituted by D, F, Cl, Br, I, CN or NO2), and/or an aryl or heteroaryl ring system with 5-60 aromatic ring (which is optionally substituted by one or more R3); and    R2 = 1-40C-alkyl, cyclic 3-40C-alkyl (optionally substituted with one or more R3, where one or more non-adjacent CH2 group are optionally substituted by R3C=CR3, -C?=C-, or C=O, and at least one H atoms are optionally substituted by D, F, Cl, Br, I, CN or NO2), and/or an aryl or heteroaryl ring system with 5-60 aromatic ring atoms (which is optionally substituted by at least one R3); or    2 or more R1 = monocyclic or polycyclic, aliphatic, aryl or heteroaryl ring system optionally substituted by R3; or    R1R2 (in 1,2-position) = a monocyclic or polycyclic, aliphatic, aryl or heteroaryl ring system optionally substituted with one or more R3; either    R3 = H, D, F, CN, 1-20C-aliphatic hydrocarbon, aryl or heteroaryl ring system with 5-30 aromatic ring atoms, in which at least one H atoms are optionally substituted by D, F, Cl, Br, I or CN; or    2 or more R3 = a mono or polycyclic, aliphatic, aryl or heteroaryl ring system;    n, t = 1-10, preferably 1-6;    m = 1, when L is a single bond, or a bivalent group, or 2, when L is trivalent group, or 3, when L is a tetravalent group; and    q = 0 or 1.    INDEPENDENT CLAIMS are included for:    (1) the compound (I) (in which not both Z group bonded to Y1 is O), or the compound (II), where (I) excludes 2-phenyl-3-p-tolyl-3H-benzo(1,3,2)oxazaphosphole 2-oxide, 2-phenyl-3-oxa-1-thia-2-phospha-cyclopenta(a)naphthalene 2-oxide, 2-phenyl-benzo(1,3,2)dithiaphosphole 2-oxide, 2-(4-vinyl-phenyl)-benzo(1,3,2)dithiaphosphole 2-oxide, 3-(2,6-dimethoxy-phenyl)-2-phenyl-3H-benzo(1,3,2)oxazaphosphole 2-oxide, 4,6-di-tert-butyl-2-phenyl-benzo(1,3,2)oxathiaphosphole 2-oxide, 2-phenyl-3-(2,4,6-trimethyl-phenyl)-3H-benzo(1,3,2)oxazaphosphole 2-oxide, 3-(2,6-dimethyl-phenyl)-2-phenyl-3H-benzo(1,3,2)oxazaphosphole 2-oxide, 3,5-dimethyl-4-phenyl-3,5-dihydro-3,5-diaza-4-phospha-cyclohepta(2,1-a;3,4-a')dinaphthalene 4-oxide, 5-methyl-2-phenyl-benzo(1,3,2)dithiaphosphole 2-oxide, 1,3-dimethyl-2-phenyl-1,3-dihydro-benzo(1,3,2)diazaphosphole 2-oxide, 2-phenyl-1,3-dithia-2-phospha-cyclopenta(1)phenanthrene 2-oxide and 2,3-diphenyl-3H-benzo(1,3,2)oxazaphosphole 2-oxide;    (2) the preparation of (Q); and    (3) an oligomer of formula (XXXVII), polymer of formula (XXXVIII) or dendrimer comprising (Q), where at least one bonds of (Q) are connected to the polymer, oligomer or dendrimer.    r = 2-1000000.