PLATE-LIKE FLUORESCENT SUBSTANCE HAVING HIGH LUMINOUS EFFICIENCY AND COACTIVATED WITH TERBIUM OR NEO

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PROBLEM TO BE SOLVED : To provide a fluorescent substance having higher luminous efficiency than that of a conventional one, in a fluorescent substance retaining a crystal state of a plate form, which is suitable as a material for a printing ink or a coating material used in security technique, and gives fluorescent characteristics by having zeolite as a matrix and retaining ions of a rare earth metal; and to provide a method for producing the same. SOLUTION : Zeolite Linde Q is added to Tb3+ or Nd3+ and ion exchanged with Ce3+. By firing, the fluorescent substance is obtained in which the structure of zeolite is lost but the crystal state of a plate form is maintained. A coactivated substance which has been ion-exchanged with Tb3+ and Ce3+ emits green fluorescent light by excitation with ultraviolet ray, and the coactivated substance which has been ion-exchanged with Nd3+ and Ce3+ emits the fluorescent light in an infrared region by excitation with ultraviolet ray. The fluorescent substance of 10-20% is added to a printing ink or a coating material used in security technique to give a sufficient emission intensity. COPYRIGHT : (C)2013, JPO&INPIT