Compounds of formula wherein L 1 is hydrogen; C 1 -C 12 alkyl; or phenyl-C 1 -C 4 alkyl; X is C 1 -C 12 alkylene, C 2 -C 12 alkenylene, C 5 -C 10 cycloalkylene, C 5 -C 10 arylene, or C 5 -C 10 arylene-C 1 -C 10 alkylene, which may by interrupted by -O-, -NH-, -S-, -CO-, o -SO 2 -; Y is the residue of an organic dye selected from radical of formula or wherein_ wherein R 1 and R 2 independently from each other hydrogen; halogen; C 1 -C 16 alkyl, which is saturated or unsaturated, linear or branched, substituted or unsubstituted, or interrupted or uninterrupted with heteroatoms; phenyl, which substituted or unsubstituted; a carboxylic acid radical; sulfonic acid radical; hydroxy; nitrile; C 1 -C 16 alkoxy, (poly)-hydroxy-C 2 -C 4 -alkoxy; halogen; sulfonylamino; SR 33; NR 33 R 34; OR 33; SO 2; COOR 33; NR 33 COR 34; or CONR 33; Q 1 is a bivalent radical selected from -N=N-; -CR d =N-; -N=CR d -; -NR d -N=CR.-; and -R d C=N-NR e -; T 1 is a bivalent radical of an aromatic or heteroaromatic substituted or unsubstituted compound; R d and R e independently from each other are hydrogen; unsubstituted or substituted C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 5 -C 10 aryl; C 1 C 10 alkyl-C 5 -C 10 aryl; or C 5 -C 10 aryl-C 1 -C 10 alkyl; R 33 and R 34 independently from each other are hydrogen; C 1 -C 12 alkyl, which may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 -alkoxy, hydroxy or - -H; - -C 1 -C 5 alkyl; phenyl or phenyl-C 1 -C 4 alkyl, wherein the phenyl moiety may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 alkoxy, halogen, -NH 2, mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, -NO 2, carboxy or hydroxy; An is an anion; Z is a group of formula or -CΞN; wherein A is O; S; or N-L 2; B is L 3; -OL 3; -NL 3 L 4; or -SL 3; and L 2, L 3 and L 4, independently from each other are hydrogen; C 1 -C 12 alkyl; C 6 -C 12 aryl; or C 6 -C 12 aryl-C 1 -C 12 alkyl. L 1 is hydrogen; C 1 -C 12 alkyl; or phenyl-C 1 -C 4 alkyl; X is C 1 -C 12 alkylene, C 2 -C 12 alkenylene, C 5 -C 10 cycloalkylene, C 5 -C 10 arylene, or C 5 -C 10 arylene-C 1 -C 10 alkylene, which may by interrupted by -O-, -NH-, -S-, -CO-, o -SO 2 -; Y is the residue of an organic dye selected from radical of formula or wherein_ wherein R 1 and R 2 independently from each other hydrogen; halogen; C 1 -C 16 alkyl, which is saturated or unsaturated, linear or branched, substituted or unsubstituted, or interrupted or uninterrupted with heteroatoms; phenyl, which substituted or unsubstituted; a carboxylic acid radical; sulfonic acid radical; hydroxy; nitrile; C 1 -C 16 alkoxy, (poly)-hydroxy-C 2 -C 4 -alkoxy; halogen; sulfonylamino; SR 33; NR 33 R 34; OR 33; SO 2; COOR 33; NR 33 COR 34; or CONR 33; Q 1 is a bivalent radical selected from -N=N-; -CR d =N-; -N=CR d -; -NR d -N=CR.-; and -R d C=N-NR e -; T 1 is a bivalent radical of an aromatic or heteroaromatic substituted or unsubstituted compound; R d and R e independently from each other are hydrogen; unsubstituted or substituted C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 5 -C 10 aryl; C 1 C 10 alkyl-C 5 -C 10 aryl; or C 5 -C 10 aryl-C 1 -C 10 alkyl; R 33 and R 34 independently from each other are hydrogen; C 1 -C 12 alkyl, which may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 -alkoxy, hydroxy or - -H; - -C 1 -C 5 alkyl; phenyl or phenyl-C 1 -C 4 alkyl, wherein the phenyl moiety may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 alkoxy, halogen, -NH 2, mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, -NO 2, carboxy or hydroxy; R 1 and R 2 independently from each other hydrogen; halogen; C 1 -C 16 alkyl, which is saturated or unsaturated, linear or branched, substituted or unsubstituted, or interrupted or uninterrupted with heteroatoms; phenyl, which substituted or unsubstituted; a carboxylic acid radical; sulfonic acid radical; hydroxy; nitrile; C 1 -C 16 alkoxy, (poly)-hydroxy-C 2 -C 4 -alkoxy; halogen; sulfonylamino; SR 33; NR 33 R 34; OR 33; SO 2; COOR 33; NR 33 COR 34; or CONR 33; Q 1 is a bivalent radical selected from -N=N-; -CR d =N-; -N=CR d -; -NR d -N=CR.-; and -R d C=N-NR e -; T 1 is a bivalent radical of an aromatic or heteroaromatic substituted or unsubstituted compound; R d and R e independently from each other are hydrogen; unsubstituted or substituted C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 5 -C 10 aryl; C 1 C 10 alkyl-C 5 -C 10 aryl; or C 5 -C 10 aryl-C 1 -C 10 alkyl; R 33 and R 34 independently from each other are hydrogen; C 1 -C 12 alkyl, which may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 -alkoxy, hydroxy or - -H; - -C 1 -C 5 alkyl; phenyl or phenyl-C 1 -C 4 alkyl, wherein the phenyl moiety may be substituted by one or more C 1 -C 5 alkyl, C 1 -C 5 alkoxy, halogen, -NH 2, mono-C 1 -C 5 alkylamino, di-C 1 -C 5 alkylamino, -NO 2, carboxy or hydroxy; An is an anion; Z is a group of formula or -CΞN; wherein A is O; S; or N-L 2; B is L 3; -OL 3; -NL 3 L 4; or -SL 3; and L 2, L 3 and L 4, independently from each other are hydrogen; C 1 -C 12 alkyl; C 6 -C 12 aryl; or C 6 -C 12 aryl-C 1 -C 12 alkyl. A is O; S; or N-L 2; B is L 3; -OL 3; -NL 3 L 4; or -SL 3; and L 2, L 3 and L 4, independently from each other are hydrogen; C 1 -C 12 alkyl; C 6 -C 12 aryl; or C 6 -C 12 aryl-C 1 -C 12 alkyl.