The fluorescent powder (commonly known as noctilucent powder), usually divided into storage luminous sheet powder and radioactive luminous powder two. Storage luminous powder is phosphor under natural light, fluorescent lights, such as UV irradiation, the energy stored, at the stop light irradiation, slowly released by fluorescence way, so at night or dark place, still can see light, long duration for several hours to ten hours. A luminous powder radioactive, is the incorporation of radioactive substances in the photoluminescent plastic, using radioactive material continuously emit X-ray excited fluorescence powder, the luminous time is very long, but toxic and environmental pollution and other small application range.
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