China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

There are three main types of fluorescent powder. First class for ordinary fluorescent lamp and low-pressure mercury lamp and the second class for high pressure mercury lamp and self ballasted fluorescent lamps, the third is UV light source, such as fluorescent lamp and low-pressure mercury lamp fluorescent powder for antimony and manganese activated halogen calcium phosphate fluorescent powder and rare-earth trichromatic fluorescent powder. Preparation of mixed material, the amount of the raw materials must first from the apatite structure was calculated in halogen calcium phosphate, calcium and manganese atomic number and the phosphate phosphorus atom ratio of 4.9:3; followed by weighing, mixing, grinding, sieving, again in a certain atmosphere (general nitrogen), to about 1150 DEG C temperature sintering hours. Remove cooling in ultraviolet lamp were selected and then pulverizing, sieving is finished halogen calcium phosphate fluorescent powder luminescence is by the activation of antimony (sb) and Mn CO activation. The position of the atoms in the lattice to occupy the position of the atoms in the lattice. This material is sensitive to the phenomenon: when the activator Sb absorbs energy, a portion of the energy is released in the form of light radiation, and the other part is transferred to the Ma in the process of the so-called resonance transfer, which makes the radiation of Ma. Therefore, the total radiation depends on the characteristics of the two kinds of activator, and changes with the proportion of its changes, but also depends on the ratio of fluorine and chlorine. Such as in the activation of sb halogen calcium phosphate increased Mn content, it will increase the orange radiation, and the corresponding reduced blue radiation. Using the above phenomenon, as long as the change of Mn content, you can give the different color temperature of halogen calcium phosphate fluorescent powder phosphors of radiation ability and fluorescent powder dispersion is related to the degree of absorption, so the particle size on the luminescence brightness of the great. The size of CaHPO4 is determined by the particle size of the raw material, so that the size of CaHPO4 can be controlled by the size of the crystal.

Rare earth trichromatic fluorescent powder, pink for the europium activated yttrium oxide (Y2O3), green powder is activated by cerium and terbium (MgAl11O19:Ce, TB) of aluminates and blue powder for low europium activated aluminum acid barium magnesium BaMg2Al16O27:Eu. Three kinds of powder are mixed according to a certain proportion, can (2700 ~ 6500k) and the corresponding lamp luminous efficiency up to 80 ~ 100lm / W, color index of 85 to 90 different color temperature. Generally speaking, the higher the content of green powder, the lower the content of blue powder, the higher the luminous efficiency of the lamp. In addition, blue powder increases, the color temperature; increase the pink, color temperature is reduced three colors powder matrix and activated substances vary, but the luminous key lies in the rare earth activated substance (EU, CE, TB), and uses light rare earth trichromatic phosphor trichromatic fluorescent lamp itself has many outstanding advantages with rare earth metal ions outer (D, f) transition. However, rare earth materials are expensive, resulting in trichromatic lamp cost is higher, and restricts the development of the three color lights. Narrow diameter or the new coating technology to reduce trichromatic fluorescent powder dosage, with cheap other colored powder to replace one or two rare earth tricolor powder, can also be of high luminous efficiency, high color color fluorescent lamp, but decay may to a high pressure mercury lamp with a high pressure mercury lamp of fluorescent powder spectrum distribution and low pressure mercury lamp (fluorescent lamp) are significantly different. In order to improve the light efficiency and improve the light color, high pressure mercury lamp in the discharge tube outer bulb inside is coated with the fluorescent powder, will be the main radiation of a wavelength of 365nm UV energy is converted into visible light. High pressure mercury lamp by early activation of the manganese fluoride germanate magnesium or tin zinc phosphate activated strontium powder. Later, the use of color TV with the fluorescent powder YVO4:Eu, its peak is 619nm, the corresponding total light flux, color rendering performance is good. Has developed a Y (PV) O4:Eu fluorescent powder, it is more suitable for high pressure mercury lamp for UV light source with fluorescent powder it is in 253.7 nm or other short wavelength ultraviolet excitation, can produce another kind of longer wavelength ultraviolet fluorescent powder.