NOVELTY - Cyanated perylene compounds (I) are new.    USE - (I) are useful in color converter for conversion of light generated by light-emitting diode and in lighting device, for optical label, for invisible marking of products, as fluorescent dye, preferably as fluorescent labels for biomolecules, as pigment, as a fluorescent dye in a display based on fluorescence conversion, as a pigment dye in electrophoretic displays and as a fluorescent dye in a chemiluminescence-based application, in a light-collecting plastic part, which is optionally combined with a solar cell (all claimed).    ADVANTAGE - (I) provide lighting devices which show a high quantum yield, a long lifetime and high photostability when exposed to blue light.    DETAILED DESCRIPTION - Cyanated perylene compounds of formula (I) and their mixtures are new.    Z1, Z2 = 1-18C alkyl, 2-18C alkenyl, 2-18C alkynyl (all optionally substituted by Za1), 3-12C cycloalkyl (optionally substituted by Zb1), 6-14C aryl (optionally substituted by Zc1), CN, CO2R9 or CONR10R11;    R1-R8 = H, CN, Cl or Br;    R9-R11 = 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl (all optionally substituted by Ra1), 3-12C cycloalkyl (optionally substituted by Rb1), 6-14C aryl (optionally substituted by Rc1) or H;    Za1 = 3-12C cycloalkyl (optionally substituted by Rb1), 6-14C aryl (optionally substituted by Rc1), halo, OH, NR10aR11a, 1-10C alkoxy, 1-10C haloalkoxy, 1-10C alkylthio, C(=O)R9a, C(=O)O-R9a or C(O)NR10aR11a;    Zb1, Zc1 = halo, OH, NR10aR11a, 1-10C alkyl, 1-10C alkoxy, 1-10C haloalkoxy, 1-10C alkylthio, C(=O)R9a, C(=O)O-R9a or C(O)NR10aR11a;    Ra1 = halo, OH, 1-10C alkoxy, 3-12C cycloalkyl or 6-14C aryl;    Rb1, Rc1 = halo, hydroxy, 1-10C alkyl, 1-10C alkoxy, 1-10C haloalkoxy, 1-10C alkylthio, 2-10C alkenyl, 2-10C alkynyl, 3-12C cycloalkyl or 6-14C aryl; and    R9a, R10a, R11a = H, 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl, 3-12C cycloalkyl or 6-14C aryl.    Provided that 1, 2, 3, 4, 5, 6, 7 or 8 of the substituents R1, R2, R3, R4, R5, R6, R7 or R8 is CN. INDEPENDENT CLAIMS are also included for:    (1) a composition comprising (I) and their mixtures;    (2) a color converter, comprising at least one polymer as matrix and (I) as a fluorescent dye or the composition;    (3) use of color converter for conversion of light generated by light-emitting diode (LEDs); and    (4) an lighting device comprising at least one LED and at least one color converter.