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Preparation method of solid carbon dot fluorescent powder with high quantum yield and application of solid carbon dot fluorescent powder in LED (Light Emitting Diode) lamp bead

A high-quantum, fluorescent powder technology, applied in the field of nanomaterials, can solve problems such as complex purification processes, and achieve the effects of simple operation, fast preparation, and low cost

Inactive Publication Date: 2018-11-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an easy way for making nerve cells that are less expensive than existing methods but still fast enough to make them work properly.

Problems solved by technology

This technical problem addressed in this patented text relates to improving the efficiency and effectiveness of producing stable greenhouse gas emitted (GHg) semiconductor devices called COLED' slices through chemical vapor deposition techniques like vacuum evaporation, atomic layer epichloroarsthonium reduction, nitrogen lithography, electrospray ionization, spontaneously excited tripled harmony oscillators, laser irradiation, and other processes requiring precise manipulation over large areas. Additionally, current methods involve complex procedures including extraction after dissolution into organics suitable carriers due to poor reproducibility issues during production.

Method used

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  • Preparation method of solid carbon dot fluorescent powder with high quantum yield and application of solid carbon dot fluorescent powder in LED (Light Emitting Diode) lamp bead
  • Preparation method of solid carbon dot fluorescent powder with high quantum yield and application of solid carbon dot fluorescent powder in LED (Light Emitting Diode) lamp bead
  • Preparation method of solid carbon dot fluorescent powder with high quantum yield and application of solid carbon dot fluorescent powder in LED (Light Emitting Diode) lamp bead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Weigh 1.0g of potassium hydrogen phthalate, 0.5g of sodium azide, and 1.0g of boric acid, put them in a 250mL beaker, dissolve them in 20mL of formaldehyde solution, ultrasonicate for 5min to dissolve, put the mixed solution in a household microwave oven and heat it with a power of 225W 10min. After the reaction, the liquid was completely evaporated to obtain a white powder with an absolute quantum yield of 5.4%.

Embodiment 2

[0049] Weigh 0.5g of potassium hydrogen phthalate, 0.5g of sodium azide, and 0.75g of boric acid, put them in a 250mL beaker, dissolve them in 20mL of formaldehyde solution, ultrasonicate for 5min to dissolve, put the mixed solution in a household microwave oven and heat it with a power of 375W 4min. After the reaction, the liquid evaporated completely to obtain a white powder with an absolute quantum yield of 7.2%.

Embodiment 3

[0051] Weigh 0.25g of potassium hydrogen phthalate, 0.5g of sodium azide, and 1.0g of boric acid, put them in a 250mL beaker, dissolve them in 15mL of formaldehyde solution, ultrasonicate for 5min to dissolve, put the mixed solution in a household microwave oven and heat it with a power of 375W 6min. After the reaction, the liquid evaporated completely to obtain a white powder with an absolute quantum yield of 11.8%.

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Abstract

The invention relates to a preparation method of solid carbon dot fluorescent powder with high quantum yield. The preparation method comprises the following steps: weighing raw materials according tothe following constituents in parts by weight: 0.25 to 1 part of potassium hydrogen phthalate, 0.5 part of sodium azide and 0.25 to 1 part of boric acid; mixing the raw materials, then dissolving themixture in a formaldehyde solution ultrasonically, putting the mixed solution in a microwave oven for heating at the power of 225 to 750 W for 4 to 10 min, and completely evaporating the liquid at theend of reaction to obtain white powder which is nitrogen and boron-doped carbon dots (NBCDs). The preparation method is low in cost, high in preparation speed and easy to operate; the quantum yield (QY) of the prepared solid luminous NBCSs is extremely high, and the absolute solid luminous QY of the NBCSs is 67.7 percent.

Description

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Claims

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Application Information

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Owner JILIN UNIV
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