Method of producing green fluorescent powder

Abstract

The invention relates to a making method of green fluorescent powder, which comprises the following steps: mixing zinc blend as host material, cupric nitrate as activating agent, aluminum fluoride as coactivator, chlorauric acid, barium iodide as auxiliary solvent and sulfur in the blending machine to produce phosphor powder burning material; putting the phosphor powder firing material into the quartz container with the sulfur and active carbon to burn in the tunnel with protecting gas of N2; removing non-luminous or luminous abnormal powder and impurity from the phosphor powder under ultraviolet lamp to obtain the green emitting phosphor. The invention uses a fluxing agent material of the barium iodide and a new coactivator material of the aluminum fluoride, which improves luminous property of the phosphor powder with reducing particle size distribution and reduces usage of the coactivator of chlorauric acid at the same time.

Description

technical field [0001] The invention relates to a method for preparing a green fluorescent powder for a cathode ray tube, in particular to a method for preparing a fired product of the green fluorescent powder for a cathode ray tube. Background technique [0002] Green fluorescent powder for cathode ray tubes, the preparation method of the fired product is as follows: matrix material zinc sulfide, activator copper nitrate, co-activator aluminum nitrate, co-activator chloroauric acid, co-solvent system (strontium bromide, bismuth iodide, potassium iodide , ammonium iodide, antimony iodide), sulfur, and ammonium bicarbonate are weighed according to the requirements of the manufacturing process and mixed evenly in the mixer, and then the prepared phosphor powder is fired into a quartz container with sulfur and activated carbon. Inside, placed in a protective atmosphere N 2 Burn in a tunnel-type electric furnace at 950-990°C, and finally remove the non-luminescent or abnormally...

AI Technical Summary

Problems solved by technology

Since the co-solvent system used in the existing firing materials is bromide or iodide and NH 4 I. There are 4 to 5 kinds of co-solvent materials, so there are many co-solvent materials used. After the phosphor powder fired material is fired with this co-solvent system, the particle size distribution of the phosphor powder fired product is very wide, that is, phosphor powder The size of the particles is particularly large. After the phosphor powder has been subjected to the necessary water treatment, the qualified phosphor particles harvested are less, resulting in a very low yield of phosphor powder. Low; in addition, because the existing co-activator Al uses aluminum nitrate, the luminescence performance of the phosphor fired product is poor, showing low brightness and impure body color. More importantly, in the manufacture of ZnS: Cu·Al The green luminescent phosphor represented by the Au formula has worse luminous performance, especially the body color is more impure, which makes the amount of co-activator chloroauric acid increase a lot, resulting in a substantial increase in the manufacturing cost of the phosphor

[0003] In general, the existing technology has disadvantages: for large-scale production of phosphors, first, the particle size distribution of phosphor fired products is very wide, and the amount of co-activator chloroauric acid used at the same time is large; second, phosphor fired products Poor luminous performance, manifested as low brightness and impure body color

These are not conducive to product quality and cost