Fluorescent powder with core-shell structure and preparation method thereof
A technology of core-shell structure and fluorescent powder, which is applied in the field of core-shell structure fluorescent powder and its preparation, and can solve the problem that the shape of silicate-doped cerium phosphor powder cannot approximate a sphere, the influence of substrate adhesion on phosphor luminous uniformity, and luminous performance. to achieve the effects of excellent luminous performance, improved electrical conductivity, and high product quality
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Embodiment 1
[0026] Dissolve 0.2g of PVP in 10mL of deionized water, stir for 15min, add 7mL to a concentration of 1×10 -3 mol / L Ag particle solution, stirred for 12h.
[0027] Take the above-mentioned surface-treated Ag particle solution, adopt Method for coating metal nanoparticles on SiO 2 , that is, 25 mL of absolute ethanol, 6 mL of ammonia water, 1 mL of tetraethyl orthosilicate (TEOS) and 5 mL of deionized water were added respectively, and the reaction was stirred for 6 h. Then add 7.98mL of 1M Y(NO) 3 solution and 0.4mL of 0.05M Ce(NO) 3 Solution, stirred for 15min, then added dropwise 15mL 1M oxalic acid solution, stirred for 15min. Use ammonia water to adjust the pH value to 8, then stir for 10 min, filter the precipitate, wash the precipitate with deionized water, and dry.
[0028] The dried powder was ground, then sintered in air at 1200 °C for 3 h, and finally in N with a volume ratio of 95:5 2 and H 2 Heat treatment at 1200°C for 2 hours in the mixed gas, and Y is ob...
Embodiment 2
[0031] Dissolve 0.2g of PVP in 10mL of deionized water, stir for 15min, add 8mL to a concentration of 1×10 -3 mol / LAu particle solution, stirred for 8h.
[0032] Take the above-mentioned surface-treated Au particle solution, adopt Method for coating metal nanoparticles on SiO 2, that is, 25 mL of absolute ethanol, 6 mL of ammonia water, 1 mL of TEOS and 5 mL of deionized water were added respectively, and the reaction was stirred for 6 h. Then add 7.6 mL of 1M Gd(NO) 3 solution and 8mL 0.05M Ce(NO) 3 Solution, stirred for 15min, then added dropwise 15mL 1M oxalic acid solution, stirred for 15min. Use ammonia water to adjust the pH value to 9, then stir for 10 min, filter the precipitate, wash the precipitate with absolute ethanol, and dry.
[0033] The dried powder was ground, then sintered in air at 1200 °C for 3 h, and finally in N with a volume ratio of 95:5 2 and 5%H 2 Heat treatment at 1200°C for 1 hour in a mixed gas, and Gd can be obtained after cooling 1.9 SiO...
Embodiment 3
[0035] Dissolve 0.2g of PVP in 10mL of deionized water, stir for 15min, add 4mL to a concentration of 1×10 -4 mol / L Pd nanoparticle solution, stirred for 8h.
[0036] Get the above-mentioned surface-treated Pd nanoparticle solution, using Method for coating metal nanoparticles on SiO 2 , that is, 25 mL of absolute ethanol, 6 mL of ammonia water, 1 mL of TEOS and 5 mL of deionized water were added respectively, and the reaction was stirred for 6 h. Then add 8 mL of 1M Sc(NO) 3 solution and 0.4 mL of 0.01M Ce(NO) 3 Solution, stirred for 15min, then added dropwise 15mL 1M oxalic acid solution, stirred for 15min. Use ammonia water to adjust the pH value to 8.5, then stir for 10 minutes, filter the precipitate, wash the precipitate with deionized water and absolute ethanol, and dry.
[0037] The dried powder was ground, then sintered in air at 1000°C for 2 h, and finally in N with a volume ratio of 95:5 2 and H 2 Heat treatment at 1000°C for 2 hours in a mixed gas, and obta...
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