NOVELTY - Heterocyclic complexes (I) are new.    USE - (I) is useful as an emitting compound in at least one emitting layer of electronic devices, preferably organic electroluminescent devices and organic light-emitting electrochemical cells, and in electronic devices, preferably organic light-emitting transistors, organic light-emitting electrochemical transistors, organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, organic Plasmon-emitting devices or organic laser diodes. (I) or the formulation or the electronic device is useful for therapy, preferably phototherapy, prophylaxis and/or diagnosis of diseases and/or cosmetic circumstances (claimed).    ADVANTAGE - (I) is producible in high yields. The electronic device comprising (I) exhibits excellent service life, excellent efficiency, very good color coordinates and improved operating voltage.    DETAILED DESCRIPTION - Heterocyclic complexes of formula ((M(L)n(L1)m)w(x+/x-)(A)(z-/z+) (I) are new.    Either L = heterocyclic moiety of formula (II); and    L1 = coligand; or    several L, L+L1 (bonded by V1) = tridentate, tetradentate, pentadentate or hexadentate ligand system;    V1 = bridge;    M = transition metal;    Q = N or C;    X = CR or N;    Y1 = diatomic bridge containing bridge atoms, preferably C, N, O, S, Si or P (optionally substituted);    W1 = CR, N, CR=CR or CR=N (when Q = N);    Z = C (when W1 = CR=CR or CR=N) or one group Z = C and other group Z = N (when W1 = CR, N or NR); either    R = 1-20C alkyl, 1-20C alkoxy, 1-20C thioalkoxy (all linear), or 3-20C alkyl, 3-20C alkoxy, 3-20C thioalkoxy (all branched or cyclic), 2-20C alkenyl, 2-20C alkynyl (where in all groups at least one non-adjacent CH2 group may be replaced by R1C=CR1, CC, Si(R1)2, C=O, NR1, O, S or CONR1, and at least one H may be replaced by D, F, Cl, Br, I or CN), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-40 aromatic ring atoms, (hetero)aralkyl with 5-40 aromatic ring atoms, diarylamino with 10-40 aromatic ring atoms, diheteroarylamino with 10-40 aromatic ring atoms, arylheteroarylamino with 10-40 aromatic ring atoms (all optionally substituted by at least one group R1), H, D, F, Cl, Br, I, N(R1)2, CN, NO2, OH, COOH, C(=O)N(R1)2, Si(R1)3, B(OR1)2, C(=O)R1, P(=O)(R1)2, S(=O)R1, S(=O)2R1 or OSO2R1, where one R may be additionally coordinated to the metal; or    2R = mono- or polycyclic and aliphatic or (hetero)aromatic ring; either    R1 = 1-20C alkyl, 1-20C alkoxy, 1-20C thioalkoxy (all linear), or 3-20C alkyl, 3-20C alkoxy, 3-20C thioalkoxy (all branched or cyclic), 2-20C alkenyl, 2-20C alkynyl (where in all groups at least one non-adjacent CH2 group may be replaced by R2C=CR2, CC, Si(R2)2, C=O, NR2, O, S or CONR2, and at least one H may be replaced by D, F, Cl, Br, I, CN or NO2), (hetero)aromatic ring with 5-60 aromatic ring atoms, (hetero)aryloxy with 5-40 aromatic ring atoms, (hetero)aralkyl with 5-40 aromatic ring atoms, diarylamino with 10-40 aromatic ring atoms, diheteroarylamino with 10-40 aromatic ring atoms, arylheteroarylamino with 10-40 aromatic ring atoms (all optionally substituted by at least one group R2), 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; or    at least 2R1 = mono- or polycyclic and aliphatic ring; either    R2 = 1-20C hydrocarbyl (aliphatic and/or (hetero)aromatic, where at least one H may be replaced by F), H, D or F; or    at least 2R2 = mono- or polycyclic and aliphatic ring;    A = counterion;    n = 1-3;    m = 0-4;    w = 1-3; and    x, y, z = 0-3.    Provided that: when Y1 is CR=CR or CR=N then W1 is CR=CR or CR=N, or when Q is C then W1 is NR; and (wx x) = (yx z). INDEPENDENT CLAIMS are also included for:    (1) preparing (I); and    (2) a formulation, preferably a solution, dispersion or a miniemulsion comprising (I) and at least one solvent.