Novel color converter

Color converter according to any of the preceding claims, wherein the at least one organic fluorescent dye has a structure as shown in formula (XV):

• A-Fm (XV)
• where m is a number with a value of at least 2,
• F represents identical or different structural units (I) to (X) or (XX) to (XXVI) according to any of the preceding claims,
• and A is any organic radical to which F is chemically bonded.

Polymer mixture comprising at least one polymer and at least one organic fluorescent dye, comprising at least one structural unit of the formula (II)

• where one or more CH groups of the six-membered ring of the benzimidazole structure shown may be replaced by nitrogen and where the symbols are each defined as follows:
• n is a number from 0 to (10-p) for each structural unit of the formula (II);
• where p is the number of CH units which have been replaced by nitrogen in the six-membered ring of the benzimidazole structure shown,
• (X—R) is phenyl, tolyl, ethylphenyl, ortho/meta/para xylyl, mesityl, naphthyl, anthranyl, phenanthrenyl, pyrenyl, benzopyrenyl, fluorenyl, indanyl, indenyl, tetralinyl, phenoxy, thiophenoxy, 4-ethoxyphenyl,
• each of which may be mono- or polysubstituted by identical or different radicals (i), (ii), (iii), (iv) and/or (v):
• (i) C1-C30-alkyl whose carbon chain may comprise one or more —O—, —S—, —NR1—, —C≡C—, —CR1═CR1— and/or —CO— moieties and which may be mono- or polysubstituted by:
• C1-C12-alkoxy, hydroxyl, halogen, cyano and/or aryl which may be mono- or polysubstituted by C1-C18-alkyl and/or C1-C6-alkoxy;
• (ii) C3-C8-cycloalkyl whose carbon skeleton may comprise one or more —O—, —S—, —NR1—, —CR1═CR1— and/or —CO— moieties and which may be mono- or polysubstituted by C1-C18-alkyl, C1-C12-alkoxy and/or C1-C6-alkylthio;
• (iii) aryl or hetaryl, to each of which may be fused further 5- to 7-membered saturated or unsaturated rings whose carbon skeleton may comprise one or more —O—, —S—, —NR1—, —N═CR1—, —CR1═CR1—, —CO—, —SO— and/or —SO2— moieties, where the overall ring system may be mono- or polysubstituted by:
• C1-C18-alkyl, C1-C12-alkoxy, —C═CR1—, —CR1═CR1—, hydroxyl, halogen, cyano, —NR2R3, —NR2COR3, —CONR2R3, —SO2NR2R3, —COOR2 and/or —SO3R2;
• (iv) a —U-aryl radical which may be mono- or polysubstituted by the above radicals mentioned as substituents for the aryl radicals (iii), where U is a —O—, —S—, —NR1—, —CO—, —SO— or —SO2— moiety;
• (v) C1-C12-alkoxy, C1-C6-alkylthio, —C≡CR1, —CR1═CR12, hydroxyl, mercapto, halogen, cyano, nitro, —NR2R3, —NR2COR3, —CONR2R3, —SO2NR2R3, —COOR2 or —SO3R2;
• where
• R1, R2, R3 are each independently hydrogen;
• C1-C18-alkyl whose carbon chain may comprise one or more —O—, —S—, —CO—, —SO— and/or —SO2— moieties and which may be mono- or polysubstituted by C1-C12-alkoxy, C1-C6-alkylthio, hydroxyl, mercapto, halogen, cyano, nitro and/or —COOR1;
• aryl or hetaryl, to each of which may be fused further saturated or unsaturated 5- to 7-membered rings whose carbon skeleton may comprise one or more —O—, —S—, —CO— and/or —SO2— moieties, where the overall ring system may be mono- or polysubstituted by C1-C12-alkyl and/or the above radicals mentioned as substituents for alkyl.