Abstract: The invention relates to a security element (1), comprising a first luminescent substance, for a security document (5), the latter (5) comprising a base body (51) consisting of a base material. The aim of the invention is to increase the protection against forgery. To achieve this: the security element is provided with a second luminescent substance; energy is transmitted between the first luminescent substance and the second luminescent substance, whereby the frequency range of the excitation of one of the luminescent substances corresponds to the emission frequency range of the other luminescent substance; and the first luminescent substance is thermally unstable at the ignition temperature of the base material and/or at a temperature of 185° C.

Abstract: The invention relates to a security element (1), comprising a first luminescent substance, for a security document (5), the latter (5) comprising a base body (51) consisting of a base material. The aim of the invention is to increase the protection against forgery. To achieve this: the security element is provided with a second luminescent substance; energy is transmitted between the first luminescent substance and the second luminescent substance, whereby the frequency range of the excitation of one of the luminescent substances corresponds to the emission frequency range of the other luminescent substance; and the first luminescent substance is thermally unstable at the ignition temperature of the base material and/or at a temperature of 185° C.

Abstract: The invention relates to a security feature (8) for security documents (9), in particular bank notes. A first body colour (51) is applied in a first region (1) and a printing ink (53), in particular a day luminescent dye, is applied in an illuminating region (3). The printing ink (53) is applied outside the copy dye range of the four colour prints according to the Europe-scale or DIN-scale. According to the invention, a first mixed colour (54) of the first body colour (51) and the printing ink (53) is applied in a first overlapping region (13), and the first mixed colour (54) is arranged outside the copy dye range or in the edge region of the copy dye range, in order to increase protection against forgery.