Emitting phosphor is how? What phosphor glowing principle is

"Phosphor" light of revelation

In order to understand the chemical composition of the phosphor, we first thought of the firefly's glow, glowing firefly principles are the following series of processes.

Protein + into light into light into light oxygenated enzyme protein (glows green)

Oxygenated into light into light protein protein + H2O

That is why can firefly continuous light and flash light flash reason, it is worth noting that the green light emitted from the firefly is a "cold light", the result of the conversion as high as 97%.

Secondly, we also pay attention to the light-emitting plastic glow, glowing plastic mainly braced some radioactive material in ordinary plastic, in the light of lower radiation exposure, such as 14C, 35Sr, 90Sr and Na, Th, and light-emitting materials ZnS, CaS these sulfides , is excited and emits visible light (luminescence).

Chemical composition of the silicate phosphor fuzzy, tungstates, single element Ba, Sr and finally to the standard formula to deepen, the chemical composition of:

Category

Chemical Formula

Color

Density

Red powder

Y2O3: Eu

White

5.1 ± 0.2

Green powder

CeMgL11O19: Tb

White

4.2 ± 0.2

Blue powder

BaMgAl10O17: Eu

White

3.7 ± 0.2

Bimodal blue powder

BaMgA10O17: (Eu, Mn)

White

3.8 ± 0.2

The conversion of the phosphor, i.e., the infrared component of the excitation of the phosphor is:

Chemical composition: YErYbF3

Appearance: white inorganic powder

Grain size: 30nm

Excitation wavelength: 980nm

Color: Green

Features: high transmittance, a higher solvent, acid and alkali resistance

Several methods to deal with phosphors hazards

Since the phosphor in fluorescent tubes filled process, contain higher amounts of Hg, so the main source of harm is its dissemination of Hg vapor, authoritative data show:

Mercury vapor of 0.04 to 3 mg, the cause chronic poisoning people in the February-March; amount of 1.2 to 8.5 milligrams, will induce acute mercury poisoning, should the amount of 20 mg, will directly lead to animal death.

Once mercury enters the human body, can be quickly dispersed and accumulated to the kidney, breast and other tissues and organs, chronic mercury poisoning can cause mental disorders, autonomic disorders, acute symptoms often headache, fatigue, fever, swelling of the mouth and digestive tract gums pain, going to the dogs bleeding, loose teeth, etc., part of the skin of red spots, pimples, a few kidney damage, individual kidney pain, chest pain, dyspnea, cyanosis, such as acute interstitial pneumonia.

Should custody and improper disposal of mercury, will cause great harm to the environment, which in various forms into the environment, pollute soil, air and water, and then enter the body through the food chain, endangering people's health living, and therefore must not be fluorescent tubes discarded debris everywhere.

If the indoor fluorescent tube cracked after 1 gram available iodine / m fumigation or direct addition of alcohol with 1 g / m on the ground set the iodine dispersed 8-12 hours, so that volatilization or sublimation of the iodine is generated in the air mercury less volatile mercuric iodide (Hg + I2 = HgI2). For reducing the concentration of mercury vapor, but also with a 5% -10% of the ferric chloride or 10% bleach rinse contaminated ground.