Near ultraviolet fluorescent powder preparation method
A fluorescent powder and near-ultraviolet technology, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of affecting the luminous efficiency of phosphors, uneven distribution of activator concentration, reducing the performance and quality of phosphors, etc., and achieve the improvement of relative emission intensity , Perfect crystallization and thorough restoration effect
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[0021] In the preparation step (1) of the phosphor powder of the above structural formula, the amount of dilute hydrochloric acid should be calculated according to the chemical equivalent, and an appropriate excess is allowed. The dilute hydrochloric acid used is prepared from commercially available high-grade pure concentrated hydrochloric acid and deionized water, and the ratio of concentrated hydrochloric acid to deionized water is (1-1.5):1. Stir while mixing during co-precipitation.
[0022] In the preparation step (2) of the fluorescent powder of the above structural formula, in order to ensure that the mixed salt precipitation contains an appropriate amount of NH 4 Cl is used as a reducing agent and a flux, and the mixed salt precipitation does not need to be filtered and washed, but is directly dried, and there is no need for pre-calcination after drying.
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[0024] Weigh Eu 2 o 3 0.088 g, anhydrous CaCl 2 5.49 g and (NH 4 ) 2 SO 4 6.61 g, the Eu 2 o 3 Dissolve with an appropriate amount of dilute hydrochloric acid to form EuCl 3 Aqueous solution, the weighed CaCl 2 and (NH 4 ) 2 SO 4 respectively dissolved in deionized water to obtain its transparent aqueous solution. Then put EuCl 3 Aqueous solution and CaCl 2 The aqueous solution was mixed evenly, and finally the (NH 4 ) 2 SO 4 Aqueous solution was added to EuCl 3 and CaCl 2 In the mixed aqueous solution, stir while adding to form a mixed sulfate precipitate of Eu and Ca, put the precipitate in a drying oven and dry it at 100 ° C ~ 130 ° C, after cooling, take it out and grind it in an agate mortar for 1 hour , put it into a crucible, cover it, place it in a high-temperature furnace, and burn it for 1 hour at 700°C under the protection of a reducing atmosphere. After cooling with the furnace, after taking out and pulverizing, the structural formula is (Ca 0...
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