NOVELTY - Perylene compounds (I), are new, where (I) excludes N,N'-dimethylheptachloroperylene imide and N,N'-dimethyloctachloroperylene imide.    USE - (I) is useful as: an emitter material; a charge transport material; an exciton transport material; an electron conductor and a semiconductor in organic field effect transistors, organic solar cells and organic light-emitting diodes; active material in the organic photovoltaics, preferably as exciton transport material in exciton photovoltaic cells; light absorber or light emitter; fluorescence dye in chemiluminescence-, fluorescence conversion-display and light gathered synthetic part, which optionally combines with the solar cell; fluorescence label for biomolecules; and pigment dye in electrophoretic displays. (I) are useful for: optical labeling, and invisible marking of products (all claimed). (I) is useful in integrated circuits, n-channel metal oxide semiconductor field-effect transistor, complementary metal-oxide semiconductor analogous semiconductor module, preferably microprocessors, microcontrollers, static random access memory, other digital logic circuits, extensive and/or flexible display, radio frequency identification display, liquid crystal displays for the manufacture of flat panel displays, mobile phones and laptops.    ADVANTAGE - (I) exhibits improved substrate compatibility and processability. (I) provides solar cells with very good quantum yields.    DETAILED DESCRIPTION - Perylene compounds of formula (I), are new, where (I) excludes N,N'-dimethylheptachloroperylene imide and N,N'-dimethyloctachloroperylene imide.    Y1 = O or NR1a;    Y2 = O or NR1b;    R1a , R1b = H or an organyl residue, preferably optionally substituted alkyl, alkenyl, alkadienyl, alkynyl, cycloalkyl, bicycloalkyl, cycloalkenyl, heterocycloalkyl or (hetero)alkyl;    Z1-Z4 = O or S; and    R11-R14, R21-R24 = Cl or F, where: 1 or 2 residues of R11-R14, R21-R24 is CN and/or 1 residue of R11-R14, R21-R24 is H, if Y1 is R1a, then one of the residues of Z1 or Z2 is NR1c, and the residues R1a and R1c together forms a bridge group X with 2-5 atoms between the flanking bonds, and if Y2 is NR1b, then one of the residues of Z3 or Z4 is NR1d, and the residues R1b and R1d together forms a bridge group X with 2-5 atoms between the flanking bonds.    INDEPENDENT CLAIMS are included for:    (1) the preparation of (I);    (2) an organic field effect transistor comprising a substrate with at least a gate-structure, a source-electrode, a drain-electrode and (I), as n-semiconductor;    (3) a substrate with several organic field effect transistors, where at least a part of the field effect transistors contains (I), as n-semiconductor; and    (4) a semiconductor module comprising at least a substrate.