Glitter powder (commonly known as fluorochrome) is usually divided into photo-energy storage luminous powder and radioactive luminous powder. The photo-storing fluorochrome is a glitter powder that is stored after being exposed to natural light, daylight, ultraviolet light, etc., and is slowly released in a fluorescent manner after stopping the light irradiation, so at night or in the dark. , still can see the light, lasting for hours to ten hours. The radioactive luminous powder is a kind of radioactive material mixed in the glitter powder, and the luminescent light emitted by the radioactive material is used to excite the glitter powder to emit light. Such luminous powder has a long time of illuminating, but because of toxic and harmful environmental pollution, the application is relatively high. cautious.
There are three main types of glitter powder for lamps. The first type is used for ordinary fluorescent lamps and low-pressure mercury lamps, the second type is used for high-pressure mercury lamps and self-ballasted fluorescent lamps, and the third type is used for ultraviolet light sources. There are many kinds of glitter powder, and the price is different. The glitter powder has the characteristics of good thermal stability, safety and environmental protection. It is suitable for all kinds of white light and can adjust different colors of red, blue, yellow, etc. The glitter powder for fluorescent lamps and low-pressure mercury lamps has strontium, manganese-activated halophosphorus glitter powder and a dilute trichromatic glitter powder.
The mirror-manganese-activated calcium halophosphate glitter powder is prepared by mixing a small amount of activator ladder (Sb) and manganese (lMn) into the chlorofluoroapatite matrix 3Ca3(P04)2·Ca(F, C1)2. glitter powder, usually expressed as:
3Ca3(P04)2·Ca(F,C1)2: Sb, JMn The preparation method of the glitter powder may be different, but the purity of the raw material is high. When formulating the mixture, the amount of each raw material is first calculated theoretically from the apatite structure in the calcium halophosphate. The sum of the grammage of calcium and manganese is 4.9:3 for the phosphorus in the phosphate; Weighing, mixing, grinding, sieving and then sintering in a certain atmosphere (usually with nitrogen) at a constant temperature of about 1150C for several hours; after taking out the cooling, it is selected under the UV lamp, and then finely sieved to obtain the finished product.
When the activator b absorbs the excitation energy and then releases a part of the energy in the form of light radiation, the calcium halophosphate glitter powder of different color temperatures can be obtained by changing the content of Mn by the above phenomenon.
The ability of the net light powder to absorb radiation is related to the degree of dispersion of the glitter powder, so the size of the particle size has a great influence on the brightness of the light. The particle size of the calcium halophosphate glitter powder is determined by the particle size of the raw material CaHP04. Therefore, by obtaining a certain size and lattice crystal CaHP04, the glitter particle size can be controlled to a certain size (5~1.0µ), thereby obtaining high luminescence brightness. .
In the rare earth-primary glitter powder, the red powder is the activated oxidation of the yam (Y203:Eu), the green powder is the paved and activated aluminate (MgA111019:Ce, Tb), and the blue powder is the low-price shop activated strontium aluminate. Magnesium (BaMg2A116027: Eu). The three kinds of powders can be mixed in a certain ratio to obtain different color temperatures (2700~6500K), and the corresponding lamps can have luminous efficiency of 80~1001m/W and color rendering index of 85~90. Generally speaking, the higher the green powder content and the lower the blue powder content, the higher the luminous efficiency of the lamp. In addition, the blue powder increases, the color temperature increases; the red powder increases, and the color temperature decreases.
The matrix activator of the blue-based base toner is the same, but the key to the luminescence is the rare earth activator (paving, decoration, paving, etc.), which uses the transition of the rare earth metal outer layer ions (0→F) to emit light.
The three-color fluorescent lamp using rare earth three-color glitter powder has many outstanding advantages. However, the rare earth raw material is expensive, which causes the cost of the three-color lamp to be high, which limits the development of the three-primary color lamp. Reducing the diameter of the pipe or using a new coating technique to reduce the amount of the three primary toners, and partially replacing one or two rare earth tribasic toners with inexpensive other colored powders, can also produce high-efficiency, high-color fluorescent lamps, but light The decline may be a little bigger.
The luminescence of the halophosphoric acid glitter powder is the activation of the activator (Sb) and manganese Mn. The activator atom occupies the position of the calcium atom in the lattice. This material has a sensitization phenomenon: when the activator Sb absorbs the excitation energy, a part of the energy is released as light radiation, and the other part is transferred to Mn during the transfer of the requested resonance, so that n generates its own radiation. Therefore, the total radiation depends on the characteristics of the two activators and varies with its proportion, depending on the proportion of fluorine and chlorine. If the manganese content is increased in the sb-activated halophosphate, it will increase the orange-yellow radiation, and correspondingly reduce the blue radiation. By using the above phenomenon, as long as the content of Mn is changed, calcium halophosphate glitter powders having different color temperatures can be obtained.
The spectral distribution of high-pressure mercury lamps for high-pressure mercury lamps is significantly different from that of low-pressure mercury lamps (fluorescent lamps). In order to improve the efficiency of the lamp and improve the color of the light, the high-pressure mercury lamp is coated with glitter powder in the outer bulb of the discharge tube to convert 365 nm ultraviolet energy, which is one of the main radiation wavelengths, into visible light. High-pressure mercury lamps use manganese-activated fluorine, magnesium or tin-activated barium phosphate powder in the early stage. Later, the glitter powder YVo4:Eu for color TV was used, and its peak value was 619 nm. The corresponding total luminous flux of the lamp was high and the color rendering performance was good. Y(PV)04:Eu glitter powder has been developed, which is more suitable for the requirements of high pressure mercury lamps.
The glitter powder for ultraviolet light source is a glitter powder that can generate another ultraviolet light with a longer wavelength under the excitation of 253.7mm or other shorter wavelength ultraviolet rays. There are many kinds of it.
(BaSi203): Pb glitter powder is an effective UV glitter powder with a peak value of 350 nm and a black light for trapping insects. Calcium orthophosphate ((Ca, Zn) 3 (P04) 2: T1) glitter powder is a high-efficiency powder with a wavelength of 280-350 nm and a peak of 310 nm. The copying lamp must have a spectral line that matches the absorbance of the photoreceptor or photocathode used. Therefore, the diazo copy lamp uses barium pyrophosphate (Sr2P207:Eu), and the electrostatic copying lamp uses magnesium sulphate (MgGa204:Mn) and silicic acid. Ultraviolet glitter powder such as zinc (Zn2Si04: Mn).