LED packaging material capable of emitting white light under excitation of deep ultraviolet light and preparation method of LED packaging material
A technology of LED encapsulation and deep ultraviolet light, applied in the field of white light synthesis, can solve the problems of harm to human body and environment, increased damage to human eyes, high price, etc., to achieve the effect of less environmental harm, high solution cost, and improved utilization rate
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[0037] A preparation method of an LED encapsulation material emitting white light under excitation of deep ultraviolet light of the present invention comprises the following steps:
[0038] Step 1, using the hydrothermal method, weigh the required grams of citric acid and urea according to the following ratio and dissolve them in 10-25ml of N,N-dimethylamide in advance, and then place them in two 50ml polytetrafluoroethylene In the high-pressure reactor, two reactors are placed in an oven at the following temperature, and heated for the following time, and the processes for preparing two kinds of nitrogen-doped graphene / carbon quantum dots are shown in Table 1;
[0039] Table 1 Process conditions of two kinds of quantum dots
[0040]
[0041]Step 2, naturally cool the reaction kettle in step 1 to room temperature, mix the respective reaction solutions and ethanol at a volume ratio of 1:2, pour them into a beaker, stir with a glass rod for 5-15 minutes, and wait until the mi...
Embodiment 1
[0050] A preparation method of an LED encapsulation material emitting white light under excitation of deep ultraviolet light of the present invention comprises the following steps:
[0051] Step 1, first put 1.536g of citric acid and 4.8g of urea in a 50ml polytetrafluoroethylene autoclave, then add 25ml of N,N-dimethylamide into it, and put it in an oven at 180°C for hydrothermal reaction8 Hours to prepare yellow carbon quantum dots;
[0052] Step 2, put 4.032g of citric acid and 1.68g of urea in a 50ml polytetrafluoroethylene autoclave, then add 25ml of N,N-dimethylamide into it, and put it in a 140°C oven for hydrothermal reaction for 6 hours blue carbon quantum dots;
[0053] Step 3, naturally cool the autoclave that finished the reaction in step 1 and step 2 to room temperature, add 50ml of ethanol to the obtained solution, stir magnetically for 15min, and centrifuge at 5000r / min for 10min after the solution is fully fused to remove large precipitates , keep the superna...
Embodiment 2
[0068] A preparation method of an LED encapsulation material emitting white light under excitation of deep ultraviolet light of the present invention comprises the following steps:
[0069] Step 1, first put 0.768g of citric acid and 2.4g of urea in a 25ml polytetrafluoroethylene autoclave, then add 12.5ml of N,N-dimethylamide into it, and put it in a 180°C oven for hydrothermal reaction Preparation of yellow carbon quantum dots in 8 hours;
[0070]Step 2, put 2.016g of citric acid and 0.84g of urea in a 25ml polytetrafluoroethylene autoclave, then add 12.5ml of N,N-dimethylamide into it, and put it in an oven at 140°C for hydrothermal reaction 6 hour blue carbon quantum dots;
[0071] Step 3, naturally cool the autoclave that has finished the reaction in step 1 and step 2 to room temperature, add 25ml of ethanol to the resulting solution, and stir magnetically for 15 minutes. After the solution is fully fused, centrifuge at 4500r / min for 15 minutes to remove large precipitat...
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