LIGHT-EMITTING MEDIUM AND METHOD FOR READING LIGHT-EMITTING MEDIUM

摘要

[Problem] To provide a light-emitting medium with which analysis of light emitted from a light emitter is difficult. [Solution] A light-emitting medium 10 which comprises a substrate 11 and a light emitter 12. The light emitter 12 has: a first light emitter 12A which emits first infrared radiation a when exposed to visible light, infrared radiation, or ultraviolet radiation; and a second light emitter 12B which emits second infrared radiation b. The first light emitter 12A is formed in a first planar region 11A, and the second light emitter 12B is formed in a second planar region 11B. The first planar region 11A and the second planar region 11B overlap and form a gradational overlapping planar region 11C.