The principle of fluorescent powder luminescence

I. The Inspiration from “Fluorescent Powder” Luminescence
To understand the chemical composition of fluorescent powder, we first thought of the luminescence of fireflies. The luminescence principle of fireflies mainly involves the following series of processes.
Light-producing protein + Light-producing enzyme + Oxygen-containing light-producing protein (produces green light)
Oxygen-containing photoluminescent proteins + H2O photoluminescent proteins
This is the reason why fireflies can keep emitting light and the light flashes intermittently. It is worth noting that the green light emitted by fireflies is a “cold light”, and the conversion efficiency of this light is as high as 97%.
Secondly, we also noticed the luminescence of luminescent plastics. Luminescent plastics mainly involve adding some radioactive substances to ordinary plastics, such as 14C, 35Sr, 90Sr, and Na, Th, and the luminescent materials ZnS, CaS, which are sulfides, are excited under the irradiation of radioactive light and emit visible light (cold light).
The chemical composition of the phosphor consists of vague silicates and tungstates, a single element Ba, Sr, and finally deepens to a standard chemical formula. Its chemical composition is: Category
Chemical formula Color
Density
Red pigment
Y2O3: Eu White
5.1 ± 0.2
Green Pink
CeMgL11O19: Tb White
4.2 ± 0.2
Blue Pink
BaMgAl10O17: Eu White
3.7 ± 0.2
Double peak blue powder
BaMgA10O17: (Eu, Mn) White
3.8 ± 0.2
The upper conversion phosphor, which is the component of the infrared-excited phosphor, is:
Chemical composition: YErYbF3
Appearance: White inorganic powder
Particle size: 30nm
Excitation wavelength: 980nm
Luminescent color: Green light
Characteristics: High light transmittance, high resistance to solvents and acids and alkalis
Several methods to deal with the hazards of phosphors
Since the phosphor contains a large amount of Hg during its injection into the fluorescent lamp tube, the main source of its hazard is the emitted Hg vapor. According to authoritative data:
When the mercury vapor reaches 0.04 to 3 milligrams, it will cause chronic poisoning in humans within 2 to 3 months; when it reaches 1.2 to 8.5 milligrams, it will cause acute mercury poisoning. If its quantity reaches 20 milligrams, it will directly lead to animal death.
Once mercury enters the human body, it can quickly diffuse and accumulate in tissues and organs such as the kidneys and chest. Chronic mercury poisoning can lead to mental disorders and autonomic nerve disorders. Acute symptoms often include headache, fatigue, fever, redness and swelling of the gums in the oral and digestive tract, ulceration and bleeding, loose teeth, etc. Some skin red spots, papules, a few kidney damages, individual kidney pain, chest pain, breathing difficulties, cyanosis, etc. Acute interstitial pneumonia.