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Preparation method, product and application of yellow carbon (nitrogen) quantum dot containing red and green binary colors

A quantum dot and yellow technology, which is applied in the field of preparation of yellow carbon quantum dots, can solve the problem of low display index, achieve the effect of improving color rendering index, expanding color gamut, and saving economic costs

Active Publication Date: 2020-12-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this blue-yellow dual-color carbon quantum dot, its advantage is that it can directly generate white light under the excitation of ultraviolet / near-ultraviolet light or electric excitation, but the white light generated by using this blue-yellow dual-color carbon quantum dot has a low display index. The disadvantages still exist

Method used

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  • Preparation method, product and application of yellow carbon (nitrogen) quantum dot containing red and green binary colors
  • Preparation method, product and application of yellow carbon (nitrogen) quantum dot containing red and green binary colors
  • Preparation method, product and application of yellow carbon (nitrogen) quantum dot containing red and green binary colors

Examples

Experimental program
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Effect test

Embodiment 1

[0068] The luminescence of carbon (nitrogen) quantum dots is regulated by controlling the ratio of o-phenylenediamine and benzoic acid.

[0069] According to the composition shown in Table 1, various raw materials were weighed, and after fully stirring and dissolving, they were put into a reactor liner made of polytetrafluoroethylene, the reactor liner was put into a stainless steel cracking tank, and then the stainless steel cracking tank was placed Put it into a drying oven, keep it warm at 180°C for 10h according to the process shown in Table 1, and cool it down to room temperature naturally. In this embodiment, the polar organic solvent is ethanol, the amount of ethanol is 20ml, and the mass percentage of o-phenylenediamine in the solvent is 0.94%.

[0070] After opening the reaction kettle, first filter the reaction product with a 0.22 μm filter membrane. Further, it was purified by using a liquid chromatography column (with dichloromethane and methanol as solvents) to r...

Embodiment 2

[0075] Controlling Luminescence by Reaction Temperature

[0076] The differences between the preparation method of this example and Example 1 are shown in Table 2.

[0077] In this embodiment, the emission spectra of the synthesized carbon (nitrogen) quantum dots under excitation at 365, 472, 538 and 572nm are respectively as follows Figure 7-Figure 10 shown. and Figure 1-4 By comparison, it can be found that under the same composition and the same excitation wavelength conditions, as the temperature increases, the relative intensity of the green light component with a peak emission wavelength of about 541nm decreases, while the relative intensity of the red light component with a peak emission wavelength of 600nm and 650nm increases. The sample synthesized at 210°C is the strongest, and the red light emission intensity of the sample at 220°C is lower than that of the sample at 210°C. Therefore, increasing the temperature within a certain range is conducive to increasing ...

Embodiment 3

[0086] Carbon (nitrogen) quantum dot fluorescent film and white light source with continuously adjustable color temperature

[0087] The 3W blue light downlight produced by Shenzhen SWOT Lighting Co., Ltd. is used as the blue light excitation source. The downlight uses Sanan Optoelectronics 5730 chip, the rated power of the chip is 0.5W, and each downlight is equipped with 6 LED lamp beads.

[0088] First prepare a polyvinyl alcohol (PVA) aqueous solution with a mass fraction of 10%. After the PVA is completely dissolved, take the No. 9 carbon (nitrogen) quantum dot prepared in the above-mentioned Example 2 and add carbon to the PVA solution according to the volume ratio of 15%. (nitrogen) quantum dot solution, fully mix carbon (nitrogen) quantum dots and PVA solution evenly, after defoaming and degassing, coat the PVA solution mixed with carbon (nitrogen) quantum dots on the light guide plate, and wait for the PVA solution After drying, a layer of solid carbon (nitrogen) quan...

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Abstract

The invention discloses a preparation method of yellow carbon (nitrogen) quantum dots containing red and green binary colors, which relates to the technical field of functional inorganic nonmetallic materials and comprises the following steps of pouring benzoic acid, o-phenylenediamine and a solvent into a reaction kettle, reacting at 140-260 DEG C for 1-24 hours, and purifying the product in thereaction kettle to obtain the yellow carbon (nitrogen) quantum dots containing red and green binary colors. The solvent comprises an alcohol compound and a polar organic solvent, and the molar ratio of o-phenylenediamine to benzoic acid is 5: 3-15. The invention also provides the carbon (nitrogen) quantum dot prepared by the preparation method and application thereof. The preparation method has the beneficial effects that the prepared yellow carbon (nitrogen) quantum dot can emit green light and red light at the same time, and compared with a conventional yellow carbon quantum dot, the prepared yellow carbon (nitrogen) quantum dot can improve the color rendering index, expand the color gamut range and save the economic cost.

Description

technical field [0001] The invention relates to the technical field of characteristic functional inorganic non-metallic materials, in particular to a preparation method, product and application of yellow carbon (nitrogen) quantum dots containing red and green dual colors. Background technique [0002] The development of new lighting and display technologies such as Mini-LEDs (Mini-LEDs), Micro-LEDs (Micro-LEDs), and Quantum Dot Electroluminescence LEDs (QLEDs) requires the development of new quantum dot luminescent materials. [0003] Classic rare earth luminescent materials used in white LED device packaging, such as yellow phosphor (Y,Gd) 3 (Al,Ga) 5 o 12 :Ce(YAG:Ce), green phosphor Lu 3 (Al,Ga) 5 o 12 :Ce(LuAG:Ce), red phosphor (Ca,Sr)AlSiN 3 :Eu, etc. The particle size of these phosphors is often on the order of microns, which cannot meet the application requirements of Mini-LEDs, Micro-LEDs, and QLEDs. New lighting and display technologies are gradually developin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCC09K11/65B82Y20/00B82Y40/00H01L33/504
Inventor 陈雷王家龙杨磊郑桂芳杨志强
Owner HEFEI UNIV OF TECH
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