Use of mixtures comprising, as components, K1) one or more compounds of the general formula k1 D-A as an electron donor or electron acceptor, in which D is a donor moiety which comprises at least one carbon-carbon or carbon-heteroatom double bond and at least one unfused or fused carbo- or heterocyclic ring, A is an acceptor moiety selected from the group consisting of: in which R 310 and R 320 are each independently hydrogen, C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, or C 5 -C 7 -cycloalkyl, R 330 is hydrogen, C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, partly fluorinated C 1 -C 10 -alkyl, perfluorinated C 1 -C 10 -alkyl, C 5 -C 7 -cycloalkyl or aryl, R 340 is hydrogen, NO 2, CN, COR 350, COOR 350, SO 2 R 350 or SO 3 R 350, in which R 350 is defined as aryl or C 1 -C 10 -alkyl, R 410 is C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, C 5 -C 7 -cycloalkyl, aryl, aryl-C 1 -C 10 -alkyl, aryloxy-C 1 -C 10 -alkyl, an -NHCOR 420 moiety or an -N(CO R 420) 2 moiety, in which R 420 is defined as aryl, aryl-C 1 -C 10 -alkyl or C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, and the two R 420 in the -N(CO R 420) 2 moiety may be the same or different, X is independently CH or N and Y is O, C 2 or C (COOR 430), in which R 430 is defined as C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, and the donor moiety D and the acceptor moiety A are n-conjugated to one another, and K2) one or more compounds which act correspondingly as electron acceptors or electron donors toward component K1), for production of photoactive layers for organic solar cells and organic photodetectors. K1) one or more compounds of the general formula k1 D-A as an electron donor or electron acceptor, in which D is a donor moiety which comprises at least one carbon-carbon or carbon-heteroatom double bond and at least one unfused or fused carbo- or heterocyclic ring, A is an acceptor moiety selected from the group consisting of: in which R 310 and R 320 are each independently hydrogen, C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, or C 5 -C 7 -cycloalkyl, R 330 is hydrogen, C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, partly fluorinated C 1 -C 10 -alkyl, perfluorinated C 1 -C 10 -alkyl, C 5 -C 7 -cycloalkyl or aryl, R 340 is hydrogen, NO 2, CN, COR 350, COOR 350, SO 2 R 350 or SO 3 R 350, in which R 350 is defined as aryl or C 1 -C 10 -alkyl, R 410 is C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, C 5 -C 7 -cycloalkyl, aryl, aryl-C 1 -C 10 -alkyl, aryloxy-C 1 -C 10 -alkyl, an -NHCOR 420 moiety or an -N(CO R 420) 2 moiety, in which R 420 is defined as aryl, aryl-C 1 -C 10 -alkyl or C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, and the two R 420 in the -N(CO R 420) 2 moiety may be the same or different, X is independently CH or N and Y is O, C 2 or C (COOR 430), in which R 430 is defined as C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, and the donor moiety D and the acceptor moiety A are n-conjugated to one another, and D is a donor moiety which comprises at least one carbon-carbon or carbon-heteroatom double bond and at least one unfused or fused carbo- or heterocyclic ring, A is an acceptor moiety selected from the group consisting of: R 310 and R 320 are each independently hydrogen, C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, or C 5 -C 7 -cycloalkyl, R 330 is hydrogen, C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, partly fluorinated C 1 -C 10 -alkyl, perfluorinated C 1 -C 10 -alkyl, C 5 -C 7 -cycloalkyl or aryl, R 340 is hydrogen, NO 2, CN, COR 350, COOR 350, SO 2 R 350 or SO 3 R 350, in which R 350 is defined as aryl or C 1 -C 10 -alkyl, R 410 is C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, C 5 -C 7 -cycloalkyl, aryl, aryl-C 1 -C 10 -alkyl, aryloxy-C 1 -C 10 -alkyl, an -NHCOR 420 moiety or an -N(CO R 420) 2 moiety, in which R 420 is defined as aryl, aryl-C 1 -C 10 -alkyl or C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, and the two R 420 in the -N(CO R 420) 2 moiety may be the same or different, X is independently CH or N and Y is O, C 2 or C (COOR 430), in which R 430 is defined as C 1 -C 10 -alkyl which may be interrupted by one or two nonadjacent oxygen atoms, and the donor moiety D and the acceptor moiety A are n-conjugated to one another, and K2) one or more compounds which act correspondingly as electron acceptors or electron donors toward component K1),