Patent ID: 7575253
Filing Date: 2009-08-18
Classification: B41M,B44F,C09B,C09D,Y10S,Y10T

Abstract:
1. A fluorescent image-printed article comprising a substrate, and an image formed on the substrate, wherein the image is formed from a fluorescent ink including a binder, and a first fluorescent substance and a second fluorescent substance both dispersed in the binder, both capable of emitting fluorescence as they are irradiated with ultraviolet rays, and both substantially transparent to visible light; the first fluorescent substance is an europium complex which is capable of emitting a fluorescence having a wavelength of a first visible light region when irradiated with ultraviolet rays of a first wavelength; and the second fluorescent substance is a terbium complex which is capable of emitting a fluorescence having a wavelength of a second visible light region differing in wavelength from that of the first visible light region when irradiated with ultraviolet rays of a second wavelength; at least one of the first fluorescent substance and the second fluorescent substance being formed of a europium or terbium complex containing, as a ligand, a compound represented by the following formula (1): wherein, X and Y are the same or different and are individually an element selected from the group consisting of O, S and Se; R