Why Does Tungstate Glow?
Tungstate phosphor is a typical self activated luminescent material.
Without the addition of other activated ions, they can produce high efficiency luminescence under the excitation of UV, X ray and CR. Tungstate matrix has the characteristics of stable luminescence spectrum, wide spectrum of luminescence spectrum and large area of visible light. The higher the purity, the greater the brightness of the luminescence, then, why does tungstate glow?
The reason why tungstate will emit light, its roots from tungstate chromium ions, tungstate generally have wolframite structure and scheelite structure, among them, among them, tungstate crystal scheelite structure with a higher density, high-energy particles and high-energy radiation has a high ability to stop, is a good scintillator or X-ray emitter. At low temperature (liquid nitrogen or helium temperature) by ultraviolet short wavelength excitation, will emit green or blue light, it is the main material for the manufacture of high performance nuclear radiation detector and X ray machine.
Some scholars have studied the luminescence principle of tungstic acid by using instruments. It is found that the luminescence spectrum of tungstate is very stable, and the intrinsic luminescence spectrum is very wide and occupies most of the visible region, the cations in tungstate strongly affect the position of the emission band, and with the increase of atomic number of the cation, the peak shift of the emission band is blue, and the bandwidth is 250 - 300nm. The brightness of tungstate with compound purity increases. Some of the tungstate itself does not emit light, but when some rare earth elements are doped, the luminescent properties are activated and emit a special property of light.
The luminescence properties of tungstate, people not only to create a sophisticated medical equipment to save lives, but also produce a colorful LED fluorescent light of life. In addition, the light emitting property of tungstate can degrade many industrial wastewater, and it is also a good assistant to protect the earth and maintain the ecology.
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