NOVELTY - A metal-carbene complex (I), is new.    USE - New metal-carbene complex is used in light emitting layer and organic electronic device e.g. organic light emitting diode, organic photovoltaic cell, organic field effect transistor and light emitting electrochemical cell used for apparatus with visual display unit e.g. illumination, information panel, mobile visual display unit, illumination unit, keyboard, items of clothing, furniture and wallpaper, and used for electrophotographic photoreceptor, photoelectric converter, organic solar cell, switching element, organic light emitting field effect transistor, image sensor and dye laser and electroluminescent device (all claimed). Uses include but are not limited to cell phone, smart phone, digital camera, MPEG audio layer-3 player and laptops.    ADVANTAGE - The new metal-carbene complex provides organic electronic devices having improved CIE color coordinates, lifetime and stability, and high color rendering index.    DETAILED DESCRIPTION - A metal-carbene complex of formula (I), is new.    M=Ir or Pt;    R1,R2=linear or branched 1-20C alkyl, optionally substituted 3-20C cycloalkyl, optionally substituted 6-30C aryl, optionally substituted 5-18C heteroaryl (all optionally interrupted by heteroatom and optionally having functional group) or hetero atom;    A1-A4=CR3 or N;    R3=linear or branched 1-20C alkyl, optionally substituted 3-20C cycloalkyl, optionally substituted 6-30C aryl, optionally substituted 5-18C heteroaryl (all optionally interrupted by heteroatom and optionally having functional group), H or group with donor or acceptor action chosen from halogen radicals, SiMe3, SiPh3, OMe, NO2, CN, NCO, NCS and CF3;and    K',L=bidentate monoanionic ligand.    (i) If M is Ir, then o is 1-3, m is 0-2, n is 0-2, and m+n+o is 3; and (ii) If M is Pt, then o is 1-2, m is 0 or 1, n is 0 or 1, and m+n+o is 2. INDEPENDENT CLAIMS are included for the following:    (1) organic electronic device, which consists of at least one metal-carbene complex;    (2) light emitting layer, which consists of at least one metal-carbene complex; and    (3) use of metal-carbene complex for electrophotographic photoreceptor, photoelectric converter, organic solar cell, switching element, organic light emitting field effect transistor, image sensor, dye laser and electroluminescent device.