Pearlescent pigment for security purposes including organic or inorganic fluorescent material

A pearlescent pigment, comprising:

• a flake substrate;
• a coating layer formed on the flake substrate;
• and and
• a fluorescent layer formed on the coating layer, the fluorescent layer comprising a fluorescent material;
• wherein the coating layer comprises:
• a first coating layer comprising at least one of Fe3O4, Fe2O3 and TiO2;
• a second coating layer formed on the first coating layer, the second coating layer comprising MgO.SiO2;
• and
• a third coating layer formed on the second coating layer, the third coating layer comprising at least one of Fe3O4, Fe2O3 and TiO2,
• wherein the fluorescent layer comprises an organic-inorganic hybrid fluorescent material comprising:
• an organic fluorescent material selected from a group consisting of tetraphenylnaphthacene, tris(1-pentylisoquinoline)iridium(III), bis(2-benzo[b]thiophen-2-yl-pyridine)(acetylacetonate)iridium(III), tris[4,4′-di-tert-butyl-(2,2)-bipyridine]ruthenium(III), DCM1 (4-dicayanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran), DCM2 (4-dicayanomethylene-2-methyl-6-(julolidin-4-yl-vinyl)-4H-pyran), butyl-6-(1,1,7,7-tetramethyljulolidinyl-9-enyl)-4H-pyran), (1,10-phenanthroline)-tris-(4,4,4-trifluoro-1-(2-thienyl)-butane-1,3-dionate)europium(III), and a combination thereof;
• and
• an inorganic fluorescent material selected from the group consisting of Y2SiO5:Ce blue, Ca2B5O9Cl:Eu blue, BaMgAl14O23:Eu blue, Ba0.6Al2O3:Mn blue, Y3Al5O12:Ce green, Gd2O3:Eu red CeO2:Eu red, TiO2:Eu red, YVO4:Eu red, MgSiO3:Mn red, Zn3(PO4)2:Mn red, InBO4:Eu red, (Y, Gd)BO3:Eu red, SrTiO3:Pr red and a combination thereof.