An ink composition comprising a microparticulate fluorescent material which can emit a high brightness fluorescent light by ultraviolet ray and has a predetermined nanosize is provided. The ink composition comprises a microparticulate fluorescent material represented by the formula YVO4:A, wherein A is a rare earth metal other than yttrium, which can emit a fluorescent light by the excitation with ultraviolet ray. The fluorescent material has an average primary particle size of 30 to 400nm and has not been calcined. The fluorescent material is prepared by, for example, mixing Composition (I) containing a yttrium compound, a compound of rare earth metal other than yttrium and a complex forming compound in water with Composition (II) containing a vanadium compound in water and then reacting them.
                            本发明提供了一种由微粒荧光材料组成的油墨组合物,该微粒荧光材料可通过紫外线发出高亮度荧光,并具有预定的纳米尺寸。该油墨组合物包括由式 YVO4:A 表示的微粒子荧光材料,其中 A 是除
钇以外的稀土
金属,它能在紫外线的激发下发出荧光。荧光材料的平均主粒径为 30 至 400 纳米,且未经煅烧。荧光材料的制备方法包括:例如,将含有
钇化合物、
钇以外的稀土
金属化合物和形成络合物的化合物的组合物(I)在
水中与含有
钒化合物的组合物(II)在
水中混合,然后进行反应。