Preparation method and application of red carbon quantum dot with high quantum yield

A carbon quantum dot, high quantum technology, applied in the field of high quantum yield red carbon quantum dots and preparation, can solve the problems of weak light emission, low quantum yield, and difficulty in realizing three-primary color carbon quantum dots warm white LEDs, etc. High crystallinity, uniform particle size distribution and good stability

Active Publication Date: 2018-05-18
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently synthesized red carbon quantum dots have relatively weak luminescence due to more defects on the surface, resulting in a lower quantum yield.
Therefore, it is difficult to realize warm white LEDs based on trichromatic carbon quantum dots

Method used

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  • Preparation method and application of red carbon quantum dot with high quantum yield
  • Preparation method and application of red carbon quantum dot with high quantum yield
  • Preparation method and application of red carbon quantum dot with high quantum yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, quantum yield is the preparation of 53% red carbon quantum dots:

[0036] Weigh 0.01 g and 0.04 g of 1,3-dihydroxynaphthalene and potassium periodate, respectively, with a mass ratio of 1:4, and dissolve them in 10 ml of ethanol with ultrasonic stirring. The above solution was transferred to a polytetrafluoroethylene-lined stainless steel autoclave with a capacity of 25 ml, and the lid of the autoclave was tightened. Solvothermal reaction was carried out at 180° C. for 0.5 hour, and then the reaction kettle was naturally cooled to room temperature, so as to obtain an ethanol solution of brown-red carbon quantum dots. Use methanol:dichloromethane (1:20~1:3) as the developer, silica gel as the filler, install a chromatographic column, spin the ethanol solution of the brown-red carbon quantum dots to dryness, dissolve in 1mL of the developer, and separate. Finally, red carbon quantum dots are obtained.

[0037] The dilute ethanol solution of the carbon quan...

Embodiment 2

[0040] Embodiment 2, quantum yield is the preparation of 50% red carbon quantum dots:

[0041] The specific steps are the same as in Example 1, except that the precursor 1,3-dihydroxynaphthalene and potassium periodate solids are 0.01 and 0.01 g respectively, and the mass ratio is 1:1. The obtained red carbon quantum dots have an absolute fluorescence quantum yield as high as 50%.

Embodiment 3

[0042] Embodiment 3, quantum yield is the preparation of 51% red carbon quantum dots:

[0043] The specific steps are the same as in Example 1, except that the volume-to-mass ratio of ethanol to 1,3-dihydroxynaphthalene is 1:5, and the obtained red carbon quantum dots have an absolute fluorescence quantum yield as high as 51%.

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Abstract

The invention relates to application of a novel fluorescent material carbon quantum dot to the field of illumination. Particularly, the invention relates to a red carbon quantum dot with high quantumyield and a preparation method and application thereof. The red carbon quantum dot is prepared by using 1,3-dioxynaphthalene or a derivative thereof as a carbon source precursor and using periodic acid as an oxidizing agent through a thermal solvent method. The red carbon quantum dot with high quantum yield, which is disclosed by the invention, has the characteristics of high crystallinity and uniform particle size distribution, and has a wide application prospect in the fields of a photoelectric device, biomedicine, a sensor and the like.

Description

technical field [0001] The present invention relates to the application of novel fluorescent material carbon quantum dots in the lighting field, specifically, the present invention relates to a high quantum yield red carbon quantum dot and its preparation method and application. Background technique [0002] White light-emitting diode (LED) is a new type of solid-state lighting source. It has received widespread attention and rapid development in the industry in recent years. Compared with traditional fluorescent lamps and incandescent lamps, it has high luminous efficiency, small size, long life, energy saving and environmental protection. Etc. At present, most commercial white LEDs are usually made of blue chips (InGaN) and yellow phosphors (YAG:Ce 3+ ) composition, due to its lack of red light components, low color rendering index, and high color temperature, most of the emitted light is cool white light, which causes great damage to the human eye and cannot meet the req...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y40/00C01P2002/01C01P2002/72C01P2002/82C01P2002/86C01P2004/64C09K11/65H01L33/502
Inventor 范楼珍王子飞袁方龙杨世和
Owner BEIJING NORMAL UNIVERSITY
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