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Magnesium oxide used in phosphor industry

Phosphor is in the ultraviolet, visible radiation and electric field caused by the action of luminescent substances, mainly used in certain electric light sources, generally refers to the mercury vapor discharge of ultraviolet radiation produced when converted to visible light or the desired wavelength of ultraviolet light-emitting substances (traditional fluorescent lamps, energy-saving lamps). But the main raw material of luminous powder in general is zinc sulfide, etc., to use part of the magnesium sulfide, of which rare earth luminescent materials with more magnesium oxide, PDP displays, LED phosphor is also partially used in magnesium oxide, and will be the main direction of the future development of phosphor.

Magnesium oxide used in phosphor industry

Three-color phosphor is issued by the red, green, blue three fluorescent phosphor by a certain ratio mixed into a variety of different color temperatures of the mixed phosphor, the current three-color phosphor mainly refers to rare-earth atoms in the 253nm ultraviolet excitation under the red, green, blue three fluorescent phosphors, by which they form a different phosphor system, the main ones are: yttrium europium oxide europium red powder and aluminate green and blue powders composed of aluminate system, and the main ones are: yttrium oxide europium red powder and aluminum salt green and blue powder composed of aluminum salt system. Yttrium europium oxide red powder and phosphate green powder and blue powder phosphate system, yttrium europium oxide red powder and borate green powder and blue powder borate system, as well as a variety of mixed systems. The phosphor that emits red light is made of yttrium oxide (rare earth) and europium oxide (rare earth). Green phosphor, cerium oxide (rare earth), terbium oxide (rare earth), as well as aluminum oxide, magnesium oxide made.

Blue phosphor by europium oxide (rare earths), as well as aluminum oxide, magnesium oxide, barium carbonate, manganese carbonate made of magnesium oxide in the phosphor in the use of adding ratio: rare earth three-color phosphor, to use magnesium oxide is blue and green powder, red powder generally do not use magnesium oxide. Magnesium oxide in the three-color phosphor, mainly for the blue powder and green powder system to provide cations.

Currently affected by the industry, the domestic leading enterprises, generally use AR (fluorescent grade) magnesium oxide, light and heavy are used, the content is generally required to 99% or even higher, the particle size requirements are generally in the following 3μm, the produced phosphor particle size is usually in the following 6μm, but the impact of the phosphor particle size is mainly rare earths and other raw materials. There are high requirements for trace elements such as iron ions.

Three-color phosphor application of three-color energy-saving lamps, the current market is more sluggish, the current demand for rare earth luminescent materials in the 14,000-20,000 tons or so, the demand for fluorescent magnesium oxide in the fluorescent grade of 500-1000 tons or so, but the actual understanding of the market, far less than this amount.

First, the traditional incandescent lamps and halogen fluorescent lamps are still in the phase-out stage also occupies a high share of the market; secondly, for most families, the major power consumers are mainly air conditioners, water heaters, refrigerators, etc., lighting power consumption is not large, energy-saving awareness is not heavy, resulting in energy-saving lamps are difficult to enter the civilian field, the market scale can not be maximized; thirdly, the rapid development of LED chip technology, the energy-saving lamps share of the squeeze. Fourth, the three-color phosphor mainly depends on rare earth materials, rare earth resources are valuable, high cost.

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