NOVELTY - Phosphorus-containing metal complexes (I) are new.    USE - (I) are useful in electronic devices, preferably an organic electroluminescent device, where the electronic devices are organic light emitting diodes, organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic light-emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, light-emitting electrochemical cells, organic laser diodes. (I) are useful as emitting compounds in one or more emitting layers, preferably in combination with a matrix material comprising ketones, phosphine oxides, sulfoxides, sulfones, triarylamines, carbazole derivatives, indolocarbazole derivatives, indenocarbazole derivatives, azacarbazole derivatives, bipolar matrix materials, silanes, azaborols, boronic esters, triazine derivatives, zinc complexes, diaza- and/or tetraazasilol derivatives. (I) and the electronic device are useful for therapy, prophylaxis and/or diagnosis of diseases and/or cosmetic circumstances (all claimed). (I) are useful in display or lighting technology and in the field of phototherapy, where the phototherapy or light therapy is useful in medical and/or cosmetic applications. (I) or the devices are useful to treat skin diseases e.g. psoriasis, skin aging, skin wrinkles, cellulite, folliculitis, actinic keratosis, skin lesions, skin ulcers, acne, jaundice, vitiligo, skin tumors, atopic dermatitis, rheumatoid arthritis, pain, wounds, neurological diseases, edema, Paget's disease, connective tissue diseases, allergic reactions, viral infections, preferably infections caused by herpes simplex or human papillomavirus to treat warts and genital warts or sleeping sickness, and for disinfection of wounds, the disinfection of surgical instruments or other objects, the disinfection of food, liquids, preferably water, drinking water and other drinks. No biological data given.    ADVANTAGE - (I) have improved solubility and durability and provides electronic device with improved efficiency, operating voltage and lifetime.    DETAILED DESCRIPTION - Phosphorus-containing metal complexes of formula (M(L)n(L1)m) (I) are new.    A1 = heteroaromatic fused ring system;    B1 = (hetero)aromatic ring, or (hetero)aromatic ring system, which is optionally fused;    M = iridium, rhodium, platinum, palladium, osmium or ruthenium, where M is bonded to a ligand L via N and C; either    L1 = co-ligand; or    L+L or L+L1 bonded together = tri-, tetra-, penta- or hexadentate ligand system;    W1 = -P(=V1)((R4)2) or -P((R4)2);    V1 = O or S; either    R4 = linear 1-40C-(thio)alkyl or -alkoxy, linear 2-40C-alkenyl or -alkynyl or branched or cyclic 3-40C-(thio)alkyl, -alkenyl, alkynyl, -alkyloxy or -(thio)alkoxy (all optionally substituted by one or more R2, and where one or more non-adjacent CH2-groups are optionally replaced by 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 optionally replaced by D, F, Cl, Br, I, CN or NO2), or 5-60 membered (hetero)aromatic ring system or 5-60 membered (hetero)aryloxy, 5-60 membered-(hetero)aryloxy or -aryl(alk)oxy and/or 10-40 membered di(hetero)arylamino group or -arylheteroarylamino group (all optionally substituted by one or more R2), H, D, F, Cl, Br, I or N(R2)2; or    two or more R4 together = mono or polycyclic, aliphatic, aromatic or benzofused ring system; either    R2 = linear 1-40C-(thio)alkyl or -alkoxy, linear 2-40C-alkenyl or -alkynyl or branched or cyclic 3-40C-(thio)alkyl, -alkenyl, alkynyl, -alkyloxy or -(thio)alkoxy (all optionally substituted by one or more R3, and 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 optionally replaced by D, F, Cl, Br, I, CN or NO2), or 5-60 membered (hetero)aromatic ring system or 5-60 membered (hetero)aryloxy, 5-60 membered-(hetero)aryloxy or -aryl(alk)oxy and/or 10-40 membered di(hetero)arylamino group or -arylheteroarylamino group (all optionally substituted by one or more R3), H, D, F, Cl, Br, I, CN, NO2, N(R3)2, Si(R3)3, B(OR3)2, C(=O)R3, P(=O)(R3)2, S(=O)R3, S(=O)2R3 or OS(=O)2R3; or    two or more R2 together = mono or polycyclic, aliphatic or aromatic ring system; either    R3 = H, D, F or 1-20C-aliphatic or (hetero)aromatic hydrocarbyl (where one or more H-atoms are optionally replaced by F); or    two or more R3 together = mono- or polycyclic, aliphatic or aromatic ring system;    p, q = greater than or equal to 0, where p+q is greater than or equal to 1;    n = 1-3, where M is iridium or rhodium when n is 1, or where M is platinum or palladium when n is 2; and    m = 0-4, where the indices n and m are selected so that the coordination number of metal M for iridium or rhodium is 6 and for platinum or palladium is 4.    INDEPENDENT CLAIMS are included for:    (1) the preparation of (I); and    (2) a formulation comprising (I) and a solvent.