Photoluminescent Tumbled Gravel What will glow in the dark plastic products called

1 Long Afterglow 

Long-lasting storage luminous materials are photoluminescent (Photoluminescence) of a material, the excitation energy is the energy that can be any kind of ambient light, such as: sunlight, lighting, etc. 

. The basic principle of this luminescent Photoluminescent Tumbled Gravel‍ material is: a material preparation process, the doped luminescent center-forming element in the matrix and the center of the trap, when excited by external light, the light emitting center 

Electronic ground state to an excited state, when the electron transition from the excited state to the ground state, light emission is formed. Meanwhile, some of the electrons in the excited when falling into the trap center is bondage. After removal of light 

, Disturbed by ambient temperature, bound to fall into the trap out of the trap-state electronic energy released to stimulate the formation of a light emitting luminescent center. Since the electron is bound to trap affected by ambient temperature 

Disturbance gradually out of the trap, so luminous performance of a lengthy process, which formed a long afterglow. 

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. 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 Photoluminescent Rigid Sheet‍ 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, has been banned in most countries use. 

The new long afterglow luminescent material is to be found in the nineties, it is completely different from the traditional type of sulfide-and radiation-excited luminous material does not contain any harmful elements, stable performance, 

Afterglow long time. Aluminosilicate ceramic material such as the matrix material to form a rare earth element-doped luminescent centers and trapping centers, the display having a good night. In this New types of long afterglow luminescent materials mainly to a variety of adhesive materials can be made into various forms of nighttime display or decorative devices. For example: Mixed coated with transparent sintered ceramic powder, made ??from 

Luminescent ceramic; masterbatch added to the light-emitting plastic granules, plastic sheet, or may be made of a light emitting film; mixed with the transparent resin or adhesive, use can be made of various paints or coatings ‍