Manufacturing method of strontium-magnesium-tin phosphate red fluorescent powder used for high-color developing energy-saving lamp

Abstract

The invention relates to a manufacturing method of strontium-magnesium-tin phosphate red fluorescent powder used for a high-color developing energy-saving lamp, which comprises the flowing processing steps: 1) dry-method material blending: materials are firstly sieved by a 100-mesh sieve, mixed and then ball-ground for 12 to 48 hours; 2) one-time reducing sintering: putting mixed material of the fluorescent powder into an alumina crucible and then putting the mixing material in a tunnel furnace in hydrogen reducing atmosphere to sinter for 1 to 10 hours at high temperature of 1050 to 1150 DEGC; and 3) wet-method dispersion: sieving sintered fluorescent powder blocks by the 100-mesh sieve, putting the sieved fluorescent powder blocks into a disperser for ball-milling dispersion for 0.3 to8 hours, sieving dispersed slurry by a 400-mesh sieve, then washing for 2 to 4 times with water, and then conducting drawing and filtering, drying for 8 to 20 hours at the temperature of 110 to 120 DEG C, and sieving the dried powder by the 100-mesh sieve, thus obtaining the finished product of the red fluorescent powder used for a high-color developing energy-saving lamp.

Description

technical field [0001] The invention relates to a method for manufacturing fluorescent powder, in particular to a method for manufacturing strontium magnesium tin phosphate red fluorescent powder for high color rendering energy-saving lamps. Background technique [0002] In recent years, with the improvement of people's lighting requirements, high color rendering energy-saving lamps have become more and more popular in hospitals, museums, libraries and other places. The general chemical formula of strontium magnesium tin phosphate red phosphor for high color rendering energy-saving lamps is (Sr, Mg) 3 (PO 4 ) 2 :Sn 2+ Because strontium magnesium tin phosphate can increase the radiation in the area above 620nm, it contributes a lot to the improvement of the color rendering index of energy-saving lamps. The research on strontium magnesium tin phosphate red phosphor has a long history. At present, due to the high temperature solid phase synthesis method with simple equipmen...

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Problems solved by technology

The disadvantages in the previous research are that the process of oxidation first and then reduction is generally used, and there are many operating procedures, the number of relative control points increases, and the process is complicated. At the same time, due to the two firings, the operating margin of the phosphor is narrowed; the second is that the flux system is not enough. Optimization, so that the temperature requirements in the firing of strontium magnesium tin phosphate are extremely strict, and the particle size cannot be controlled arbitrarily, which 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

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