Advantages of High Purity Alumina as LED Phosphors
High-purity alumina is often used in the production of luminescent materials, such as rare earth tricolor phosphors, long afterglow phosphors, PDP phosphors, and the main raw materials for LED phosphors.
High-purity alumina has high hardness and good chemical resistance. To form high-purity grades, more than 1400℃ of calcination is required to convert the product into alpha-phase high-purity alumina.
High-purity alumina has good insulating properties, uniform and small particle size, and large specific surface area of the powder.
With these excellent properties, high-purity alumina products can be widely used not only in the preparation of sapphire substrates and special ceramics for LED, but also as phosphors in LED lighting.
High-purity alumina powder is an important basic material for preparing tricolor rare earth aluminate series phosphors and long afterglow phosphors for LED lighting.
Because the fluorescent lamp made of tri-color phosphor is twice as effective as the fluorescent lamp made of halogen powder, 20 watts can be as bright as 40 watt fluorescent lamps, so they are called energy-saving lamps.
The high-purity alumina reflects the ultraviolet light passing through the phosphor layer, so that it continues to excite the phosphor and improves the luminous efficiency.
Blocking the diffusion of mercury can reduce the amount of mercury and prolong the service life.
As a binder, it can improve the bonding strength between the phosphor and the glass tube, so that the phosphor does not fall off.
The luminous degree and quality of LED lamps are directly affected by the purity, crystal form, particle size distribution and other characteristics of alumina, so the quality requirements for high-purity alumina products are very high.
