NOVELTY - A diazabenzimidazole metal-carbene complex, is new.    USE - The metal-carbene complex is useful for electrophotographic photoreceptors, photoelectric converters, organic solar cells (organic photovoltaics), switching elements, organic light emitting field effect transistors (OLEFETs), image sensors, dye lasers, electroluminescent device, organic electronic device, and light-emitting layer. The organic electronic device, or the emitting layer is useful for apparatus selected from stationary visual display units, illuminations, information panels, and mobile visual display units; illumination units; keyboards; items of clothing; furniture; and wallpaper. The ligands are useful for production of metal carbene-complexes (all claimed).    ADVANTAGE - OLEDs comprising the metal-carbene complexes of formula (I) in an organic electronic device, preferably in an OLED, especially as an emitter material in an OLED, show improved device performance such as high quantum efficiency, high luminous efficacy, low voltage, good stabilities and/or long lifetimes.    DETAILED DESCRIPTION - A diazabenzimidazole metal-carbene complex of formula (I), is new.    M=Pt, or Ir; if M is Ir, m is 1 , 2, or 3; o is 0, 1 , or 2; and the sum of m + o is 3; with the proviso that, if o is 2, the ligands L may be the same or different; if M is Pt, m is 1 , or 2; o is 0, or 1; and the sum of m + o is 2;    L=a monoanionic bidentate ligand;    R=a group of formula (i);    R'=H, 1-5C alkyl group, or a fluoro(1-4C)alkyl group;    R1=H, a 1-5C alkyl group, a fluoro(1-4C)alkyl group, or a 3-6C cycloalkyl group;    R2=H, a 1-5C alkyl group, a fluoro(1-4C)alkyl group, or a 3-6C cycloalkyl group;    R3, R3', and R3''=independently of each other, hydrogen; a 1-18C alkyl group, which can optionally be substituted by E and/or interrupted by D; a (3-12C)cycloalkyl group, which can optionally be substituted by G; a 3-10C heterocycloalkyl radical which is interrupted by at least one of O, S and NR65 and/or substituted by E; a 6-24C aryl group, which can optionally be substituted by G; or a 2-30C heteroaryl group, which can optionally be substituted by G; a halogen atom, especially F or Cl, CF3, CN, or SiR80R81R82; where R3 and R3', or R1 and R3' together form a group of formula (ii);    X=O, S, NR75 or CR73R74;    R4, R4' and R5=independently of each other, hydrogen; a 1-18C alkyl group, which can optionally be substituted by E and/or interrupted by D; a (3-12C)cycloalkyl group, which can optionally be substituted by E; a (3-10C)heterocycloalkyl radical which is interrupted by at least one of O, S and NR65 and/or substituted by E; a 6-14C aryl group, which can optionally be substituted by G; or a 2-10C heteroaryl group, which can optionally be substituted by G; a halogen atom, especially F or Cl, CF3, CN, or R4 and R4' together form a group of formula (iii) or (iv);    R6 and R7=independently of each other hydrogen, a 1-8C alkyl group, optionally interrupted by at least one heteroatom selected from -O-, -S- and -NR65-, optionally bearing at least one substituent, which is selected from the group consisting of 1-8C alkyl, 1-8C alkoxy, halogen, preferably F, and 1-8C haloalkyl, such as CF3; a (3-6C)cycloalkyl group, optionally bearing at least one substituent, which is selected from 1-8C alkyl, 1-8C alkoxy, halogen, preferably F, 1-8C haloalkyl, such as CF3; a hetero 3-6C cyclo alkyl group, interrupted by at least one heteroatom selected from -O-, -S- and -NR65-, optionally bearing at least one substituent, which is selected from 1-8C alkyl, 1-8C alkoxy, halogen, preferably F, 1-8C haloalkyl, such as CF3; or a 6-14C arylgroup, which can optionally be substituted by one, or two 1-8C alkyl groups; or R6 and R7 form together a ring of formula (v) or (vi);    A21, A21', A22, A22', A23, A23', A24' and A24=independently of each other, H, a 1-4C alkyl group, a 3-6C cycloalkyl group, a fluoro-1-4C alkyl group;    D=-CO-, -COO-, -S-, -SO-, -SO2-, -O-, -NR65-, -SiR70R71-, -POR72-, -CR63=CR64-, or -C triple bond C;    E=-OR69, -SR69, -NR65R66, -COR68, -COOR67, -CONR65R66, -CN, or F;    G=E, or a 1-18 alkyl group, a 6-14C aryl group, a 6-14C aryl group, which is substituted by F, 1-18C alkyl, or 1-18Calkyl, which is substituted by F and/or interrupted by O; a 2-10C heteroaryl group, or a 2-10C heteroaryl group, which is substituted by F, 1-18C alkyl, SiR80R81R82, or 1-8C alkyl which is substituted by F and/or interrupted by O;    R63 and R64=independently of each other H, 6-18C aryl; 6-18C aryl which is substituted by 1-18C alkyl, or 1-18C alkoxy; 1-18C alkyl; or 1-18C alkyl which is interrupted by -O-; and    R65 and R66=independently of each other a 6-18C aryl group; a 6-18C aryl which is substituted by 1-18C alkyl, or 1-18C alkoxy; a 1-18C alkyl group; or a 1-18C alkyl group, which is interrupted by -O-; or R65 and R66 together form a five or six membered ring.    Full definitions are given in the DEFINITIONS (Full Definitions) Field. INDEPENDENT CLAIMS are included for:    (1) an organic electronic device, comprising at least one metal-carbene complex;    (2) a light-emitting layer comprising, at least one metal-carbene complex;    (3) an apparatus selected from stationary visual display units, illuminations, information panels, and mobile visual display units; illumination units; keyboards; items of clothing; furniture; wallpaper, comprising the organic electronic device, or the emitting layer;    (4) a process for preparing metal-carbene complex; and    (5) use of ligands of formula (D) for production of metal carbene-complexes.