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Solid-state yellow light carbon quantum dot composite based on multiple emission peaks and preparation method thereof

A technology of carbon quantum dots and composites, applied in luminescent materials, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve problems such as missing spectra and complicated preparation steps

Active Publication Date: 2021-01-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to apply it to white LEDs, carbon quantum dots are dispersed in polyvinylpyrrolidone and dried to form a film to achieve solid-state light emission, and combined with LED chips. The results show that only when blue, green, and red multicolor carbon quantum dots are mixed, In order to obtain a white LED device with a high color rendering index, the use of a single carbon quantum dot will produce a significant spectral loss
The same is true for most other research situations. In order to obtain white LEDs with good color rendering index, solid carbon quantum dots of two or more fluorescent colors need to work together, which will complicate the preparation steps.

Method used

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  • Solid-state yellow light carbon quantum dot composite based on multiple emission peaks and preparation method thereof
  • Solid-state yellow light carbon quantum dot composite based on multiple emission peaks and preparation method thereof
  • Solid-state yellow light carbon quantum dot composite based on multiple emission peaks and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 10 mL of formamide, mix it with 10 mL of glycerol evenly, then add 1.6 g of phthalic acid, stir, mix and disperse evenly at room temperature to obtain a reaction solution.

[0034] The above reaction solution was placed in a 40 mL stainless steel autoclave lined with tetrafluoroethylene, and solvothermally reacted in an oven at 180 ° C for 4 h.

[0035] After the reaction was completed and cooled to room temperature, the obtained solid-liquid mixed product was taken out and vacuum-filtered with a 0.22 μm microporous membrane. The obtained solid was dried in a drying oven at 60° C. to obtain a fibrous yellow solid, which was ground into a powder with a mortar to prepare a solid yellow carbon quantum dot composite powder.

[0036] figure 1 It is the physical picture of the solid yellow light carbon quantum dot composite prepared above under the irradiation of fluorescent lamp and 365nm ultraviolet lamp. The left picture shows that the carbon quantum dot composite i...

Embodiment 2

[0047] Take 10 mL of formamide, mix it with 10 mL of glycerol evenly, add 2.4 g of phthalic acid, stir, mix and disperse evenly at room temperature to obtain a reaction solution.

[0048] The above reaction solution was placed in a 40 mL stainless steel autoclave lined with tetrafluoroethylene, and solvothermally reacted in an oven at 180 ° C for 6 h.

[0049] After the reaction was completed and cooled to room temperature, the obtained solid-liquid mixed product was taken out and vacuum-filtered with a 0.22 μm microporous membrane. The obtained solid was dried in a drying oven at 60° C. to obtain a fibrous yellow solid, which was ground into a powder with a mortar to prepare a solid yellow carbon quantum dot composite powder.

[0050] from Figure 9 It can be seen that the fluorescence emission spectrum of the solid-state yellow light carbon quantum dot composite has multi-peak characteristics, with emission peaks at 525, 565 and 615 nm, respectively, and the fluorescence sp...

Embodiment 3

[0052] Take 15mL of formamide, mix with 5mL of glycerol evenly, add 1.6g of phthalic acid, stir, mix and disperse evenly at room temperature to obtain a reaction solution.

[0053] The above reaction solution was placed in a 40 mL stainless steel autoclave lined with tetrafluoroethylene, and solvothermally reacted in an oven at 160 ° C for 4 h.

[0054] After the reaction was completed and cooled to room temperature, the obtained solid-liquid mixed product was taken out and vacuum-filtered with a 0.22 μm microporous membrane. The obtained solid was dried in a drying oven at 60° C. to obtain a fibrous yellow solid, which was ground into a powder with a mortar to prepare a solid yellow carbon quantum dot composite powder.

[0055] from Figure 10 It can be seen that the fluorescence emission spectrum of the solid-state yellow light carbon quantum dot composite has multi-peak characteristics, with emission peaks at 525, 565 and 615 nm, respectively, and the fluorescence spectrum...

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Abstract

The invention discloses a solid yellow-light carbon quantum dot compound based on multiple emission peaks and a preparation method thereof. According to the preparation method, phthalic acid is used as a carbon source and formamide is used as a nitrogen source, glycerol serving as a solvent is added or not added, and a solid yellow-light carbon quantum dot compound fluorescent product is directlyprepared by adopting a solvothermal method. The prepared solid yellow-light carbon quantum dot compound can emit bright multi-peak wide-spectrum yellow fluorescence in a solid state, effectively avoids aggregation-induced fluorescence quenching effect in a solid state, and is applicable as fluorescent powder to preparation of a white light emitting diode.

Description

technical field [0001] The invention belongs to the technical field of fluorescent light-emitting materials, and relates to a carbon quantum dot composite, in particular to a yellow light carbon quantum dot composite material capable of emitting multiple emission peaks in a solid state, and the preparation of the carbon quantum dot composite method. Background technique [0002] Quantum dots are structures whose three-dimensional dimensions are in the nanoscale range. Materials with a quantum dot structure will produce quantum size effects, quantum confinement effects, and quantum tunneling effects, etc., thus exhibiting physical and chemical properties that are very different from those of bulk materials. [0003] Carbon quantum dots are zero-dimensional carbon nanomaterials with a particle size of less than 10nm. They are monodisperse spherical quantum dots with a carbon structure as the basic skeleton and a large number of oxygen-containing groups distributed on the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y30/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y30/00B82Y40/00C01P2002/72C01P2002/82C01P2004/04C09K11/65C01B32/15H01L33/502
Inventor 郑静霞郑延宁杨永珍卢太平刘旭光许并社
Owner TAIYUAN UNIV OF TECH
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