The Luminous Material of Watches

Of course, in addition to daily use, such as fluorescent lamps

, television sets and computer screen are all on the second light-emitting principle. Traditional fluorescent coating material can be divided into self-luminous type and luminescent. Since the light-emitting fluorescent agents are mostly carried by its trace of radioactive material released ray excited luminescence fluorescent agent. The fluorescent agent Chu does not contain radioactive material, but it need to reserve absorb external light in advance and of sufficient strength, itself level and stored from the low-level electronic transitions to the high energy. 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 shine. Type the luminescent material itself does not carry ray excited, so the afterglow durability than being self-luminous type. More common early fluorescent coating is made of radioactive radium salts activator, for its radioactive, received use it on the progressive restriction and now it has begun to phase out. Material is generally excited with the current tritium (3H or T), promethium (Pm) and radioactive radium sulfate (Ra) of the fluorescent agent, the fluorescent agent mostly zinc sulfide, calcium sulfide or zinc sulfide, and other of strontium sulfite, Tritium (3H or T) and promethium (Pm), though still radioactive, but the potential damage the human body much smaller.

The Luminous Material of Watches

By: rep plicawatchwatch

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