The role of magnesium oxide in fluorescent powder

Fluorescent powder is a substance that emits light under the action of ultraviolet, visible radiation, and electric fields. It is mainly used for certain electrical light sources, and generally refers to a luminescent substance that converts the ultraviolet radiation generated by mercury vapor discharge into visible light or the desired wavelength of ultraviolet light (traditional fluorescent lam

        Fluorescent powder is a substance that emits light under the action of ultraviolet, visible radiation, and electric fields. It is mainly used for certain electrical light sources, and generally refers to a luminescent substance that converts the ultraviolet radiation generated by mercury vapor discharge into visible light or the desired wavelength of ultraviolet light (traditional fluorescent lamps, energy-saving lamps). But the main raw materials for luminous powder are usually zinc sulfide, and some magnesium sulfide is used. Among them, magnesium oxide is more commonly used as a rare earth luminescent material. PDP displays and LED phosphors also use some magnesium oxide, which will be the main development direction of future phosphors.

      Tri primary fluorescent powder is a mixture of fluorescent powders that emit red, green, and blue fluorescence in a certain proportion to form various mixed fluorescent powders with different color temperatures. Currently, tri primary fluorescent powder mainly refers to fluorescent powders that emit red, green, and blue fluorescence from rare earth atoms under 253nm ultraviolet excitation. They form different fluorescent powder systems, mainly consisting of yttrium europium oxide red powder, aluminate green powder, and blue powder to form an aluminate system, A phosphate system is composed of yttrium europium red oxide powder, phosphate green powder, and blue powder. A borate system is composed of yttrium europium red oxide powder, borate green powder, and blue powder, as well as various mixed systems. Fluorescent powder that emits red light, made from yttrium oxide (rare earth) and europium oxide (rare earth). Fluorescent powder that emits green light, made from cerium oxide (rare earth), terbium oxide (rare earth), as well as alumina and magnesium oxide.
       The fluorescent powder that emits blue light is made of europium oxide (rare earth), as well as aluminum oxide, magnesium oxide, barium carbonate, and manganese carbonate. The use and addition ratio of magnesium oxide in fluorescent powder: Among the three primary colors of rare earth fluorescent powder, blue powder and green powder need to use magnesium oxide, while red powder generally does not use magnesium oxide. Magnesium oxide mainly provides cations for blue and green powder systems in three primary fluorescent powders. Currently, influenced by the industry, leading domestic enterprises generally use AR (fluorescent grade) magnesium oxide, which is lightweight and heavy, with a general requirement of 99% or even higher content and a particle size requirement of generally 3 μ Below m, the particle size of the produced fluorescent powder is usually 6 μ Below m, but the main factors affecting the particle size of fluorescent powder are rare earth and other raw materials. There are high requirements for trace elements such as iron ions.
          The market for three primary energy-saving lamps using three primary fluorescent powders is currently relatively sluggish. The demand for rare earth luminescent materials is around 14000-20000 tons, and the demand for fluorescent grade magnesium oxide is around 500-1000 tons. However, the actual market situation is far from reaching this quantity. Firstly, traditional incandescent lamps and halogen fluorescent lamps are still in the stage of elimination and still occupy a high market share; Secondly, for most households, the main consumers of electricity are air conditioning, water heaters, refrigerators, etc. The lighting consumption is not high, and the awareness of energy conservation is not strong, which makes it difficult for energy-saving lamps to enter the civilian field and the market size cannot be maximized; Thirdly, the rapid development of LED chip technology has squeezed the market share of energy-saving lamps. The fourth is that three primary fluorescent powders mainly rely on rare earth materials, which are precious and costly.