NOVELTY - Anthra(2,3-b)benzo(d)thiophene derivatives (I) are new.    USE - (I) and the formulations are useful as charge transport, semiconducting, electrically conducting, photoconducting or light emitting material in an optical, electro optical, electronic, electroluminescent or photoluminescent components or devices, in which the component or device includes organic field effect transistors, thin film transistors, integrated circuits, logic circuits, capacitors, radio frequency identification tags, devices or components, organic LED, organic light emitting transistors, flat panel displays, backlights of displays, organic photovoltaic devices, solar cells, laser diodes, photoconductors, photo detectors, electro photographic devices, electro photographic recording devices, organic memory devices, sensor devices, charge injection layers, charge transport layers or interlayers in polymer LEDs, organic plasmon-emitting diodes, Schottky diodes, planarizing layers, antistatic films, polymer electrolyte membranes, conducting substrates, conducting patterns, electrode materials in batteries, alignment layers, biosensors, biochips, security markings, security devices, and components or devices for detecting and discriminating DNA sequences (all claimed).    ADVANTAGE - (I) are easy to synthesize and exhibit a low band gap, a high charge carrier mobility, a high solubility in organic solvents, a good processability for the device manufacture process, a high oxidative stability and a long lifetime in electronic devices.    DETAILED DESCRIPTION - Anthra(2,3-b)benzo(d)thiophene derivatives of formula (I) are new.    R1, R2 = halo, -CN, -NC, -NCO, -NCS, -OCN, -SCN, -C(=O)NR1aR2a, -C(=O)X1a, -C(=O)R1a, -NH2, -NR1aR2a, -SH, -SR1a, -SO3H, -SO2R1a, -OH, -NO2, -CF3, -SF5, silyl or germanyl (both optionally substituted), carbyl or hydrocarbyl (both optionally substituted and optionally comprise one or more hetero atoms); either    R3-R6 = H, halo, -CN, -NC, -NCO, -NCS, -OCN, -SCN, -C(=O)NR1aR2a, -C(=O)X1a, -C(=O)R1a, -NH2, -NR1aR2a, -SH, -SR1a, -SO3H, -SO2R1a, -OH, -NO2, -CF3, -SF5, silyl, or carbyl (both optionally substituted) or hydrocarbyl that optionally comprises hetero atoms; or    R3R4 or R5R6 = form ring system with each other or with the benzene ring to which they are attached;    X1a = halo; and    R1a, R2a = H or optionally substituted 1-20C aliphatic or aromatic hydrocarbyl, where the benzene rings may also be substituted by additional groups R6.    INDEPENDENT CLAIMS are included for:    (1) formulation comprising (I) and one or more organic solvents;    (2) organic semiconducting formulation comprising (I), one or more organic binders or their precursors, having a permittivity ( epsilon ) at 1000 Hz of 3.3 or less, and optionally one or more solvents; and    (3) preparation of (I).