MIXED LIGHT-EMITTING BODY, LIGHT-EMITTING INK, LIGHT-EMITTING PRINTED MATTER, LIGHT-EMITTING MATERIAL-APPLIED ARTICLE AND METHOD FOR DISTINGUISHING AUTHENTICITY

摘要

PPROBLEM TO BE SOLVED: To provide a mixture of light-emitting materials, light-emitting ink, light-emitting printed matter and a light-emitting material-coated article improving a security level by a characteristic change in the color of emitted light, and a method for distinguishing authenticity. PSOLUTION: This mixture of light-emitting materials is prepared by mixing at least 2 light-emitting materials having different color of the emitted lights and times for reaching the saturation of light intensity, and light-emitting ink is prepared by dispersing the light-emitting mixture with ink vehicle. By using the ink, light-emitting printed matter by applying it on a substrate material or at least a part of the inner surface of the substrate material is produced. The method for distinguishing the authenticity is provided by arranging the light-emitting printed matter at an investigation means, irradiating ultraviolet light to the light-emitting printed matter from an ultraviolet light-irradiation part, photo-electrically converting the color of the emitted light of reflecting light from the light-emitting material of the light-emitting printed matter by the irradiation of the ultraviolet light, by a photo sensor and detecting the waveform of the behavior of the light-emitting material until reaching to the saturated intensity of the emitted light. PCOPYRIGHT: (C)2008,JPO&INPIT