METHOD FOR SHIELDING ULTRAVIOLET RADIATION AND INTENSIFYING VISIBLE LIGHT, AND ULTRAVIOLET-RADIATIO

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Provided is a method for shielding ultraviolet radiation and intensifying visible light at low cost and without using any rare metal, the method allowing ultraviolet radiation to be shielded or removed and visible light to pass through and allowing the energy of ultraviolet radiation to be used effectively to obtain visible light. The method for shielding ultraviolet radiation and intensifying visible light involves : a first excitation step of exciting a fluorescent substance with external light ranging from 200 nm to 330 nm; an internal-light emission step in which the fluorescent substance excited in the first excitation step emits internal light ranging from 330 nm to 400 nm; a second excitation step of exciting the fluorescent substance with external light ranging from 330 nm to 400 nm and the internal light ranging from 330 to 400 nm; and a visible-light emission step in which the fluorescent substance excited in the second excitation step emits visible light longer than or equal to 400 nm.