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Carbon quantum dot with ultrahigh fluorescence quantum yield, carbon quantum dot/PVA fluorescent film and preparation method and application thereof

A technology of fluorescence quantum yield and carbon quantum dots, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as poor water solubility, complicated preparation methods, and complicated operations, and achieve the effect of good water dispersibility

Active Publication Date: 2020-04-17
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the currently synthesized carbon quantum dots are short-wavelength emitting, and the few long-wavelength carbon quantum dots have low quantum yield and poor water solubility.
[0003] Traditional materials for packaging LEDs often contain heavy metal ions and rare earth elements. The preparation methods of these packaging materials are complex, cumbersome, high-cost, and cause serious pollution to the environment; therefore, it is urgent to prepare a low-cost LED with good luminous performance , an environmentally friendly luminescent material to replace traditional LED packaging materials

Method used

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  • Carbon quantum dot with ultrahigh fluorescence quantum yield, carbon quantum dot/PVA fluorescent film and preparation method and application thereof
  • Carbon quantum dot with ultrahigh fluorescence quantum yield, carbon quantum dot/PVA fluorescent film and preparation method and application thereof
  • Carbon quantum dot with ultrahigh fluorescence quantum yield, carbon quantum dot/PVA fluorescent film and preparation method and application thereof

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Embodiment 1

[0033] Embodiment 1 The preparation method of the carbon quantum dots of ultra-high fluorescence quantum yield provided in this embodiment comprises the following steps:

[0034] (1) First, pipette 1mL of prepared 10M sodium hydroxide solution and 1ml of polyethylene glycol 400, dilute the mixed solution to 15mL with ultrapure water, then weigh 30mg of rhodamine B and dissolve in the above mixed solution After stirring evenly, it was transferred to a polytetrafluoroethylene reactor, put into an oven, heated to 180°C and continued to react for 12 hours.

[0035] (2) Cool to room temperature, pour out the solution in the reaction kettle, adjust the solution to neutrality with hydrochloric acid, then divide the solution into 1000Da dialysis bags, and frequently change the water and dialyze for 72 hours to remove impurities.

[0036] (3) After the dialysis was completed, the solution was collected, concentrated by rotary evaporation at 65°C, and then freeze-dried to obtain carbon ...

Embodiment 2

[0049] Embodiment 2 The preparation method of the carbon quantum dots with high fluorescence quantum yield provided in this embodiment comprises the following steps:

[0050] (1) First, pipette 1mL of prepared 10M sodium hydroxide solution and 1ml of polyethylene glycol 400, dilute the mixed solution to 15mL with ultrapure water, then weigh 28mg of rhodamine B and dissolve in the above mixed solution After stirring evenly, it was transferred to a polytetrafluoroethylene reactor, put into an oven, heated to 200°C and continued to react for 8 hours.

[0051] (2) Cool to room temperature, pour out the solution in the reaction kettle, adjust the solution to neutrality with hydrochloric acid, then divide the solution into 800Da dialysis bags, and frequently change the water and dialyze for 92 hours to remove impurities.

[0052] (3) After the dialysis was completed, the solution was collected, concentrated by rotary evaporation at 65°C, and then freeze-dried to obtain carbon quantum ...

Embodiment 3

[0053] Embodiment 3, the preparation method of the carbon quantum dot of ultra-high fluorescence quantum yield provided by the present embodiment, comprises the following steps:

[0054] (1) First, pipette 1mL of prepared 10M sodium hydroxide solution and 1ml of polyethylene glycol 400, dilute the mixed solution to 14mL with ultrapure water, then weigh 20mg of rhodamine B and dissolve in the above mixed solution After stirring evenly, it was transferred to a polytetrafluoroethylene reactor, put into an oven, heated to 190°C and continued to react for 10 hours.

[0055] (2) Cool to room temperature, pour out the solution in the reaction kettle, adjust the solution to neutrality with hydrochloric acid, then divide the solution into 900Da dialysis bags, and often change the water and dialyze for 80 hours to remove impurities.

[0056] (3) After the dialysis was completed, the solution was collected, concentrated by rotary evaporation at 65°C, and then freeze-dried to obtain carbo...

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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to a carbon quantum dot, a carbon quantum dot / PVA fluorescent film and a preparation method and application thereof. The carbon quantum dot is prepared by taking rhodamine B as a carbon source. The preparation method of the carbon quantum dot with the ultrahigh fluorescence quantum yield comprises the following steps: dissolving rhodamine B into a reaction solution, mixing, putting into a reaction kettle, reacting for 8-12 hours at 180-200 DEG C, cooling to room temperature, and taking out a reactant; adjusting the pH value of the reactant to be 7 and then dialyzing, carrying out rotary evaporation and freeze-drying to obtain a solid powder of the carbon quantum dot. The carbon quantum dot has the beneficial effects that the carbon quantum dot with ultrahigh fluorescence quantum yield provided by the invention emits green light, has good water dispersibility and ultrahigh fluorescence quantum yield, is 84.96-85.37% in water with the pH value of 6.7, and is 95.84-96.55% when the pH value is 9.0. The carbon quantum dot can be used for preparing an environment-friendly packaging material and packaged a white light LED.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a carbon quantum dot, a carbon quantum dot / PVA fluorescent film and a preparation method and application thereof. Background technique [0002] Carbon quantum dots are a zero-dimensional carbon-based fluorescent material with a particle size of less than 10nm. They have good water solubility, photostability, excellent biocompatibility, wide source of raw materials, low cost, and environmental friendliness. Sensing, photocatalysis, solar cells, light-emitting diodes, fluorescence imaging and tracking, tumor targeting and treatment and other fields have broad application prospects. However, most of the currently synthesized carbon quantum dots are short-wavelength emitting, and the rare long-wavelength carbon quantum dots have low quantum yield and poor water solubility. [0003] Traditional materials for packaging LEDs often contain heavy metal ions and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/02H01L33/50H01L33/56
CPCC09K11/65C09K11/02H01L33/56H01L33/502
Inventor 孙晓波王进平马攀攀
Owner QINGDAO AGRI UNIV
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