Preparation method of yellow fluorescent powder for light-emitting diode (LED)
A technology of yellow fluorescent powder and light-emitting diodes, applied in the direction of luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of low luminous rate, high synthesis temperature, high hardness, etc., achieve low temperature, good uniformity, The effect of small particle size
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Embodiment 1
[0019] Use Ce oxides or nitrates as activators, weigh Y, Al, Ce oxides or Y, Al, Ce nitrates according to a certain material ratio, and dissolve Y, Al, Ce oxides in nitric acid Or Y, Al, Ce nitrates are dissolved in nitric acid or water to make Y, Al, Ce nitrates; add citric acid to the Y, Al, Ce nitrate solutions and mix well; Stir in a water bath until the precursor is formed; put the generated precursor in a vacuum oven at 120°C and dry for 12 to 24 hours, so that the water is gradually volatilized and a large amount of gas is released, and the sample becomes a xerogel; the xerogel is taken out, and the After the dry gel is ground in an agate mortar, it is sintered in a high-temperature resistance furnace at a temperature of 800° C. to 1200° C. and kept for 1 to 4 hours to obtain a sample.
[0020] Said weighing the oxide of Y, Al, Ce or the nitrate of Y, Al, Ce, wherein the material ratio of metal ion is Y: Al: Ce=3-x: 5: x, wherein x is between 0.04~ 0.07
[0021] The a...
Embodiment 2
[0026] Weigh Y according to the stoichiometric ratio 1.47:5:0.06 2 o 3 (purity ≥ 99.99%), Al(NO 3 ) 3 9H 2 O (purity ≥ 99%) and Ce (NO 3 ) 3 ·6H 2 O (purity ≥ 99.99%). Will Y 2 o 3 Soluble in dilute nitric acid, dubbed Y(NO 3 ) 3 solution. Al(NO 3 ) 3 9H 2 O was added to the stirring Y (NO 3 ) 3 solution, the mixture is added to the dissolved Ce(NO 3 ) 3 in solution. Add citric acid to the metal solution, the ratio of citric acid to total metal ions is 1:1; when the above mixed solution is placed in a household microwave oven for microwave heating to prepare the precursor, the heating power is 120W-385W, and the The time is between 2 minutes and 4 minutes. Put the generated precursor into a vacuum drying oven at 120°C for 12 hours to make the moisture gradually volatilize and release a large amount of gas, and the sample becomes a xerogel. The sample was taken out, ground in an agate mortar, and then sintered in a high-temperature resistance furnace at 900...
Embodiment 3
[0028]Weigh Y according to the stoichiometric ratio 1.48:5:0.04 2 o 3 (purity ≥ 99.99%), Al(NO 3 ) 3 9H 2 O (purity ≥ 99%) and Ce (NO 3 ) 3 ·6H 2 O (purity ≥ 99.99%). Will Y 2 o 3 Soluble in dilute nitric acid, dubbed Y(NO 3 ) 3 solution. Al(NO 3 ) 3 9H 2 O was added to the stirring Y (NO 3 ) 3 solution, the mixture is added to the dissolved Ce(NO 3 ) 3 in solution. Add citric acid to the metal solution, the ratio of citric acid to total metal ions is 1:1; stir in a water bath at 85°C until the precursor is formed; put the stirred precursor into a vacuum oven at 120°C After 12 hours, the water is gradually volatilized and a large amount of gas is released, and the sample becomes a xerogel. The sample was taken out, ground in an agate mortar, and then sintered in a high-temperature resistance furnace at 900° C. and kept warm for 2 hours to obtain a yellow phosphor for light-emitting diodes. All the other are with embodiment 1.
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