Luminescence materials generally fall into two categories : One is material to heat, light radiation produces heat , and the other is excited by the absorption of energy and physical transition to the excited state ( non- steady state ) then return to the ground state of the process, to light In the form of energy is released. Watch the use of fluorescent coating is the use of the second principle , that is, after the fluorescent material stimulated luminescence.
Luminous Material Type
Traditional fluorescent light from the coating material can be divided into two types , and luminescent type . Since the light-emitting fluorescent agents are mostly carried by its own trace of radioactive material released ray excited fluorescent light . And Chu fluorescent agent , while almost no radioactive material , but need to reserve in advance of sufficient strength to absorb and external illumination, will own electronic transitions from the low level to high level and stored . When the darkness surrounding environment , the self- absorption and gradually slow to release the energy , this time from the high -level electronic transitions to lower energy level , fluorescent agents began to light . As the storage type of light ray excited material itself does not carry , so durability for the time being as self- afterglow light type.
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