Recently learned from Hefei University of Technology, the school research team in the yttrium aluminum garnet series of LED fluorescent materials and light color control mechanism has made important achievements in order to further improve the performance of LED fluorescent material provides an important means.
High-power LED devices are widely used in public lighting and home and outdoor, however, when the LED lighting source is used for a long time, there will be dim brightness and color drift. Hefei University of Technology Materials Science and Engineering Associate Professor Chen Lei and Professor Jiang Yang task force on the issue of scientific research. Through a series of experimental methods combined with theoretical calculations, they provide a completely new explanation for the intrinsic mechanism of spectral red-shift, intensity reduction and thermal stability deterioration caused by Gd ion substitution. Due to the large Gd ion radius, the electron cloud is squeezed and deformed in the rigid structure of yttrium aluminum garnet, resulting in the enhancement of the crystal field, the reduction of the effective electron mass, the expansion of the electron spreading range and the reduction of the band gap, which leads to the decrease of the luminous efficiency And thermal stability is reduced. Recently, the research results published in the British "Nature" magazine, "Science Report" on.
According to reports, this theory not only scientifically explained the Gd substituted yttrium aluminum garnet phosphors luminescence phenomenon, but also for the development of new rigid structure of fluorescent material has an important guiding significance. "In the future, we can guide the development of man-made gemstone crystals with a specific color to give more brilliant colors, such as various artificial diamonds, sapphires and rubies, which not only show high light transmittance and reflectance, but also can be customized to make them bright and fresh Eye-catching. "Associate Professor Chen Lei introduction.
Precipitated Calcium Carbonate
Uses: Can be used as filler in rubber, plastics, paper, paint and ink industries. Widely used in organic synthesis, metallurgy, glass and asbestos production. It can also be used as a medium seeding agent for industrial waste water, a antacid for stomach and duodenal ulcers, a detoxifying agent for acidosis, a SOâ‚‚ eliminating agent in SOâ‚‚-containing exhaust gas, a dairy cattle feed additive and an anti-sticking agent for oil felt . It can also be used as a raw material for tooth powder, toothpaste and other cosmetics.
Usually used as a filler, widely used in daily chemical industries such as artificial floor tiles, rubber, plastics, papermaking, coatings, paints, inks, cables, construction supplies, food, medicine, textiles, feed, toothpaste, etc., as a filler to increase products The volume is reduced, and the production cost is reduced.
Light Calcium Carbonate is made of limestone, and can be used in daily chemical products such as tooth powder, toothpaste, cosmetics, etc. It can also be used in organic synthesis, metallurgy, glass and asbestos production.
The particle size of light calcium is smaller than that of Heavy Calcium Carbonate, the oil absorption is larger than that of heavy calcium carbonate, and the price is higher than that of heavy calcium carbonate. They are all commonly used fillers in latex paint, and they are best used together. Light calcium is better in terms of sedimentation, but its oil absorption is greater than that of heavy calcium, and the price is generally more expensive than heavy calcium. Although it is not as stable as heavy calcium, it is stable. Even for exterior wall paint, its application amount is also very large. of.
Precipitated Calcium Carbonate,Precipitate Calcium Carbonated Powder,Precipitated Calcium Carbonate Manufacturers,Activated Precipitated Calcium Carbonate
Henan Shunbang Chemical Industry CO.,Ltd , https://www.suspensionpvc.com