TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic fluorescent dye comprises at least one structural unit that is substituted 9,10-dihydro-benzo(de)imidazo(2,1-a)isoquinolin-7-one compounds of formula (s1-s15) or substituted hydrocarbon compounds of formula (A1-F1m) (III).o = 0-10;q = 0-9;r = 0-8;Z1 = CR1R2, NR1 or O;m = at least 2;F1 = s1-s15; andA1 = organic radical, preferably polymer (p1), aromatic ring system, a molecule with many aromatic ring systems, a polyhydric alcohol or a polyfunctional amine.The organic fluorescent dye comprises: 54 benzo(de)imidazo(2,1-a)isoquinolin-7-one compounds e.g. substituted benzo(de)benzo(4,5)imidazo(2,1-a)isoquinolin-7-one compounds of formula (d1)-(d9); N,N'-bis(2,6-diisopropylphenyl)-1,7-di(2,6-diisopropylphenoxy)perylene-3,4;9,10-tetracarboximide, N,N'-bis(2,6-diisopropylphenyl)-1,6-di(2,6-diisopropylphenoxy)perylene-3,4;9,10-tetracarboximide (both preferred) and/or N,N'-bis(2,6-diisopropylphenyl)-1,6,7,12-tetra-phenoxyperylene-3,4;9,10-tetracarboximide. The color converter: is in the form of plaques, sheets, films, in drop form, or as a casting; additionally comprises at least one inorganic white pigment or titanium dioxide as a scattering body; and has a barrier layer with a low oxygen permeability on at least one side.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: In the color converter: the polymer consists essentially of polystyrene, polycarbonate, poly methyl methacrylate (all preferred), polyvinylpyrrolidone, polyvinyl acetate, polyvinyl chloride, polybutene, polyethylene glycol, silicone, polyacrylate, epoxy resin, polyvinyl alcohol, polyacrylonitrile, polyvinylidene chloride, polystyrene-acrylonitrile, polybutylene terephthalate, polyethylene terephthalate, polyvinyl butyrate, polyvinyl chloride, polyamides, polyoxymethylenes, polyimides and/or polyether imide. In the device the LED and color converter are present in a remote phosphor arrangement. Preferred Definitions:    n = 1-5; and    X1-R = phenyl, naphthyl, anthranyl, phenanthrenyl, pyrenyl, benzopyrenyl, fluorenyl, indanyl, indenyl, tetralinyl, phenoxy, thiophenoxy, tolyl, ethylphenyl, ortho/meta/para xylyl, mesityl or 4-ethoxyphenyl.    EXAMPLE - 1,8-Naphthalic anhydride (15 g), 1,2-phenylenediamine (9.82 g) and zinc acetate (13.9 g) were introduced into quinoline (150 ml) under argon at room temperature. The mixture was stirred at 160 degrees C for 5 hours. The resulting hot suspension was stirred into hydrochloric acid (1000 ml). The resulting solid was filtered. The residue was washed with demineralized water (1000 ml), then with methanol. The resulting yellow residue was dried to obtain benzo(de)benzo(4,5)imidazo(2,1-a)isoquinolin-7-one (e1). Plexiglas (RTM: Poly methyl methacrylate) (2.5 g) and (e1) (0.02 wt.%) were dissolved in methylene chloride (5 ml), and titanium dioxide (0.5 wt.%) were dispersed. The resulting solution/dispersion was coated onto a glass. The solvent was dried to obtain color converter.