Sumitomo Chemical Company, Limited

Francisco Javier Rodriguez-Martinez

Nir Yaacobi-Gross

A composition comprising a first compound and a second compound of formula (I) wherein EDG is an electron-donating group comprising a polycyclic hetero aromatic group and each BAG is an electron-accepting group of formula (II) --- is a bond to EDG; each Ris, independently in each occurrence, H or a substituent; each R-Ris, independently in each occurrence, H or an electron-withdrawing group; and of the first and second compounds of formula (I), the total number of electron-withdrawing groups R-Ris greater for the first compound of formula (I). The composition may further contain an electron donor capable of donating an electron to the compounds of formula (I). The composition may be used in the photoactive layer of an organic photodetector.

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Godmanchester, United Kingdom

Francisco Javier Rodriguez-Martinez