Patent ID: 8740390

Claim:
A fluorescent substrate comprising: a base having a reflective surface; and a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base; wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed; wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a perpendicular direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed; wherein the minute reflective structure comprises a plurality of recesses; and wherein a depth of each recess in the minute reflective structure is equal in value to a thickness of the fluorescent layer from a bottom surface to a top surface of the fluorescent layer.