Method for preparing rare-earth aluminate blue-green fluorescent powder for energy-saving lamp

Abstract

The invention discloses a method for preparing rare-earth aluminate blue-green fluorescent powder for an energy-saving lamp. The method comprises the following steps of: 1, mixing sieved Al2O3, BaCO3, SrCO3, MnCO3, MgO, Eu2O3, LiF, and AlF3 to form raw materials of fluorescent powder; 2, mixing the sieved raw materials, putting in a tunnel kiln at the reduction atmosphere of hydrogen, firing at high temperature, and cooling to obtain a fired product, namely a primary product; and 3, crushing the fired primary product of the fluorescent powder, sieving by using a 100-mesh sieve, putting the sieved fluorescent powder into an air flow dispersion machine, sieving powder syrup by using a 400-mesh sieve, washing, suction-filtering, drying, and sieving the dried powder by using a 200-mesh sieve to obtain the rare-earth aluminate blue-green fluorescent powder for the energy-saving lamp. The rare-earth aluminate blue-green fluorescent powder has the characteristics of high color rendering index, low attenuation, yellow color, medium particle size and high lighting effect.

Description

technical field [0001] The invention relates to a method for manufacturing fluorescent powder, in particular to a method for manufacturing rare earth aluminate blue-green fluorescent powder for energy-saving lamps. Background technique [0002] At the end of the 20th century, from the perspective of energy-saving lighting, people's demand for energy-saving lamps has become more and more extensive. The existing tri-color energy-saving lamp, the full name of the tri-color energy-saving fluorescent lamp, is a preheated cathode gas discharge lamp, which is divided into straight tube shape, single U shape, double U shape, 2D shape and H shape. Taking the H-shaped energy-saving fluorescent lamp as an example, it consists of two glass tubes connected at the top (the inner wall of the tube is coated with rare earth three primary color phosphors), three helical filaments (cathode) and a lamp cap. Its working principle is similar to that of ordinary fluorescent lamps, and it can be e...

AI Technical Summary

Problems solved by technology

The disadvantages in the prior art are that the first oxidation and then reduction process or two reduction processes are commonly used, and there are many operating procedures, more relative control points, and a longer process cycle; the second is that the flux system is not optimized enough, so that strontium borophosphate The requirements for temperature in the process are too strict, resulting in the particle size of the product cannot be controlled at will, which is not conducive to the growth of crystals, and is not conducive to its large-scale production; the third is that the mixing method is simple, and there are often cases of uneven mixing; four. The reason is that the dispersion method is not advanced enough. The traditional ball mill dispersion often takes a long time and causes great damage to the phosphor crystal.