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Yellow carbon quantum dot fluorescent powder as well as preparation method and application

A technology of carbon quantum dots and phosphors, applied in the field of phosphors, to achieve the effects of good color stability, good thermal stability, and good excitation wavelength stability

Active Publication Date: 2018-02-13
江苏瓷光光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the shortcomings of traditional water-phase carbon quantum dots that cannot be well fused with the optical glue of the packaged device and that serious fluorescence quenching often occurs when converted into solid powder, and adopt a one-step method with simple experimental conditions and easy realization. Hydrothermal synthesis of high-efficiency yellow carbon quantum dot solid phosphors; by mixing the synthesized water-phase carbon quantum dots with low-cost, green and environmentally friendly food-grade starch and using simple physical and chemical adsorption principles to prepare capsule-type core phosphors Yellow carbon quantum dot phosphor with shell structure and excellent luminescence performance in solid state

Method used

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  • Yellow carbon quantum dot fluorescent powder as well as preparation method and application
  • Yellow carbon quantum dot fluorescent powder as well as preparation method and application
  • Yellow carbon quantum dot fluorescent powder as well as preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Synthesis of yellow carbon quantum dots: Disperse 1.4 g of o-phenylenediamine into 70 mL of deionized water, stir magnetically at room temperature until the o-phenylenediamine is completely dissolved; transfer it to a 100 mL polytetrafluoroethylene reactor, 200 ℃ hydrothermal reaction for 12 hours.

[0046] Purification and purification of carbon quantum dots: After the reaction, cool to room temperature to collect the liquid, centrifuge at 11000 rp / m for 5 min, and then filter the sample with a 0.22 μm microporous membrane to remove residual macromolecular particles that have not completely reacted; Finally, the sample was dialyzed using a dialysis bag with a molecular cutoff of 500 Da to obtain a pure, impurity-free carbon quantum dot solution.

[0047] Characterization of particle morphology of carbon quantum dots: The particle morphology of the synthesized carbon quantum dots was observed by transmission electron microscopy ( image 3 ), it can be seen that the syn...

Embodiment 2

[0050] Preparation of yellow carbon quantum dot phosphor: Take 5 mL of dialyzed carbon quantum dot solution in a beaker, add 5 g of starch (the mass ratio of starch and carbon quantum dots is 50:1), and add deionized water to 30 mL , magnetically stirred at room temperature for 6 hours; after the stirring was completed, the sample was centrifuged, the supernatant was poured off, and the precipitate was vacuum-dried at 70 °C for 2 hours; then the precipitate was taken out and ground evenly, and the fluorescence spectrometer was used to detect its different wavelengths ( 350~510 nm) excitation emission spectrum ( Figure 5 ). It can be seen that the luminous position of the carbon quantum dot phosphor does not change with the change of the excitation wavelength, and emits yellow light with a peak wavelength of 545 nm under different excitation wavelengths, which has good color stability, which is similar to that of yellow carbon The luminescent properties of the quantum dot sol...

Embodiment 3

[0052] The fluorescent powder is used to prepare a blue chip-type white LED device. In this embodiment, a strip-shaped blue light chip is used, and its luminous peak is 450 nm. The specific implementation method is as follows: take 0.25 g of the prepared yellow carbon quantum dot phosphor powder and 0.5 g of optical special glue, grind and mix until a uniform suspension is formed, and then use a dispenser to evenly drop the suspension into the concave of the blue-ray chip. In the tank, cover the blue light chip; then put the chip in a vacuum drying oven at 150 °C to cure the coating layer at a constant temperature in vacuum to obtain a white LED planar light source device, which emits bright white light after being lit ( Figure 9 ), the color temperature is 8946K, and the color rendering index is close to 80. Figure 9 Middle (a) Optical parameter diagram; (b) Device physical diagram.

[0053] Therefore, the phosphor powder provided by the present invention can be effective...

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Abstract

The invention discloses yellow carbon quantum dot fluorescent powder as well as a preparation method and application. The fluorescent powder is formed by carbon quantum dots with the particle size of10nm and starch, wherein the starch is taken as an effective adsorption carrier of a carbon quantum dot fluorophore, and the carbon quantum dots are uniformly dispersed in starch particles, so as to form a capsule type core-shell structure. The preparation method comprises the following steps: preparing the yellow carbon quantum dots with a one-step hydrothermal method and performing mixed adsorption on the yellow carbon quantum dots and the starch, so as to prepare the yellow carbon quantum dot fluorescent powder. The fluorescent powder is arranged in a luminescent layer of an LED (light-emitting diode) luminescent device and can be effectively combined with a near ultraviolet-blue-green light LED chip with the emission wavelength of 350-510nm, so that high-brightness yellow light emission can be provided. The prepared yellow carbon quantum dot fluorescent powder is novel and environment-friendly yellow solid fluorescent powder and is expected to replace the traditional rare-earth based yellow fluorescent powder; a series of problems of energy crisis, environmental pollution and the like can be relieved, and the yellow carbon quantum dot fluorescent powder has important meaning inthe development of relevant application fields of white light LED illumination, flat panel display, LED backlight sources and the like.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder, and specifically relates to a yellow carbon quantum dot fluorescent powder and a preparation method thereof. The application thereof relates to the fields of illumination and display, and is a novel, green and environment-friendly yellow fluorescent powder material. Background technique [0002] Many aspects of people's lives are inseparable from white LED display and lighting. In recent years, the white LED market has developed rapidly, has broad commercial prospects and practical value, and has attracted widespread attention from all over the world. At present, the mainstream technology used in commercial white LED devices is to combine blue light chips and yellow rare earth-based phosphors. The research on it is very in-depth, and the preparation process is mature; The problem of environmental pollution has become urgent with the large-scale exploitation of global reserves in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/02H01L33/50
CPCC09K11/025C09K11/65H01L33/502H01L2933/0041Y02B20/00
Inventor 李会利郁彩艳曹蒙蒙
Owner 江苏瓷光光电有限公司
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