Due to the long afterglow luminescent material removal can be light illumination in the dark a long time, so people will this material colloquially known as "luminous." Traditional luminous two categories: sulfur Compound-and radiation-excited type. photoluminescent paint Sulfide including ZnS, CaS, etc., and chemical properties of these materials are relatively less stable in water and ultraviolet light easily hydrolyzed or photolysis, Afterglow time is generally two to three hours, life is also shorter. Excitation radiation type is incorporated into radiant energy emitted by radioactive substances within the material as an excitation source, excitation and emission center Glow. Because such materials containing radioactive substances harmful to the environment and human health, Photoluminescent Ceramic has been banned in most countries use.
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