A kind of preparation method of wled fluorescent powder and prepared fluorescent powder and application thereof
A technology of fluorescent powder and fluorescent carbon dots, which is applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., and can solve problems such as low concentration of carbon dots, unsatisfactory fluorescence intensity of phosphor powder, and widening of the spectrum of carbon dots
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Embodiment 1
[0032] Step 1: Disperse 0.1 g of p-phenylenediamine in 10 mL of anhydrous ethylenediamine and magnetically stir for about 1 hour. Then, the mixture was transferred to a 20 mL Teflon reaction kettle, placed in an oven and heated at 200 °C for 12 hours. After cooling to room temperature, a brownish-yellow solution was obtained, which was filtered through 0.22 μM filter paper to remove large carbon dots. The resulting supernatant was dialyzed, freeze-dried and dissolved in ethanol to obtain fluorescent carbon dots;
[0033] Step 2: Add 1mmol AlCl 3 ·6H 2 O and 2.75 mmol terephthalic acid were added to 30 mL DMF and sonicated for 10 min. Then the mixture was transferred to a 50 mL polytetrafluoroethylene reactor and reacted at 150 °C for 72 h. After cooling to room temperature, a cloudy solution containing a small amount of precipitate was obtained, which was then filtered, washed with alcohol, and dried in vacuo to obtain MOF: MIL-101(A1).
[0034] Step 3: Add 1mmol AlCl 3 ...
Embodiment 2
[0040] Step 1: Disperse 0.1 g of p-phenylenediamine in 10 mL of anhydrous ethylenediamine and magnetically stir for about 1 hour. Then, the mixture was transferred to a 20 mL Teflon reaction kettle, placed in an oven and heated at 200 °C for 12 hours. After cooling to room temperature, a brownish-yellow solution was obtained, which was filtered through 0.22 μM filter paper to remove large carbon dots. The resulting supernatant was dialyzed, freeze-dried and dissolved in ethanol to obtain fluorescent carbon dots;
[0041] Step 2: Add A1mmol lCl 3 ·6H 2O and 2.75 mmol of pyromellitic acid were added to 30 mL of DMF and sonicated for 10 min. Then the mixture was transferred into a 50 mL polytetrafluoroethylene reactor and reacted at 150 °C for 60 h. After cooling to room temperature, a cloudy solution containing a small amount of precipitate was obtained, which was then filtered, washed with alcohol, and dried in vacuo to obtain MOF: MIL-101(A1).
[0042] Step 3: Add 1mmol A...
Embodiment 3
[0046] The reaction solvent in step (4) of the preparation method was replaced with DMF, and the rest of the preparation steps and raw material components were the same as in Example 1 to prepare a WLED phosphor, and the effect was white phosphor.
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