Surface modification method of aluminate yellow fluorescent powder for LED
A yellow phosphor and surface modification technology, applied in the field of surface modification of aluminate yellow phosphor for LED, can solve the problems of poor compatibility of carrier glue, low product qualification rate, fast settling speed, etc., and achieve good compatibility , The effect of high product qualification rate and slow settling speed
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Embodiment 1
[0035] Step 1, nano-SiO2 surface pretreatment:
[0036] Add 1ml tetraethyl orthosilicate to 30ml ethanol solution, under the condition of rapid stirring at 200 rpm, titrate with ammonia water with a concentration of 0.013mol / L until the pH value is about 8.5, the reaction temperature is 60°C, and react for 1h Then add 20g aluminate yellow fluorescent powder, and continue to stir for 2h;
[0037] Step 2, polyethylene glycol (PEG) surface modification:
[0038] Add 1.16g of PEG into 90ml of acetone solution, stir for 30min, mix with the solution obtained in step 1, and react for 40min under the condition of high-speed stirring at 1000 rpm. Add 468.75ml of CTAC aqueous solution with a concentration of 0.001mol / L into the mixed solution, and stir rapidly at 400 rpm for 12 hours, then dry at 100°C for 24 hours, and pass the dried phosphor powder through a 200-mesh sieve to obtain Primary products for surface treatment;
[0039] Step 3, low temperature sintering treatment:
[00...
Embodiment 2
[0042] Step 1, nano-SiO2 surface pretreatment:
[0043] Add 15ml of tetraethyl orthosilicate to 750ml of ethanol solution, and titrate with ammonia water at a concentration of 0.026mol / L under the condition of rapid stirring at 300 rpm until the pH value is about 9.0, the reaction temperature is 70°C, and the reaction is 2 hours Finally, add 300g aluminate yellow fluorescent powder and continue stirring for 3h;
[0044] Step 2, polyethylene glycol (PEG) surface modification:
[0045] Add 17.4g of PEG to 1.35L of acetone solution, stir for 35min, mix with the solution obtained in step 1, and react for 50min under the condition of high-speed stirring at 1200 rpm; Add 8 L of ammonium chloride (CTAC) aqueous solution into the mixed solution, and stir rapidly at 500 rpm. After stirring for 36 hours, dry at 100°C for 24 hours, and pass the dried fluorescent powder through a 200-mesh sieve to obtain a surface-treated primary product;
[0046] Step 3, low temperature sintering treat...
Embodiment 3
[0049] Step 1, nano-SiO2 surface pretreatment:
[0050] Add 3ml tetraethyl orthosilicate to 135ml ethanol solution, and titrate with 0.04mol / L ammonia water at a concentration of 0.04mol / L under the condition of rapid stirring at 270rpm, until the pH value is about 8.2, the reaction temperature is 70°C, and the reaction is 2h Finally, add 50g of aluminate yellow fluorescent powder and continue stirring for 4h;
[0051] Step 2, polyethylene glycol (PEG) surface modification:
[0052]Add 3.5g of PEG into 270ml of acetone solution, stir for 35min, mix with the solution obtained in step 1, and react for 60min under the condition of high-speed stirring at 1380 rpm; ) aqueous solution 750ml was added to the mixed solution, and stirred rapidly at 480 rpm for 36 hours, and then dried at 90°C for 36 hours, and the dried fluorescent powder was passed through a 200-mesh sieve to obtain a surface-treated primary product;
[0053] Step 3, low temperature sintering treatment:
[0054] Pu...
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