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a kind of nayf 4 :eu@cds composite material and its preparation method and application

A composite material and mixture technology, applied in the field of materials, can solve problems such as PL annihilation, and achieve the effects of easy operation, simple equipment and low production cost

Active Publication Date: 2021-10-19
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, realizing highly efficient solid-state light-emitting materials remains a challenge due to PL annihilation of solid-state matrix solutions for light sources transferred from their parent colloids.

Method used

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  • a kind of nayf <sub>4</sub> :eu@cds composite material and its preparation method and application
  • a kind of nayf <sub>4</sub> :eu@cds composite material and its preparation method and application
  • a kind of nayf <sub>4</sub> :eu@cds composite material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Add 1.538mmol sodium chloride to a beaker containing 30mL ethylene glycol, stir well, add 0.4mL-0.6mL polyethyleneimine (PEI) to the mixed solution, stir for 30 minutes, and then add 1mmol rare earth Ionic solution, stirred until clear, added 4mmol ammonium fluoride, stirred for 10 minutes; transferred the obtained solution to an autoclave, placed in an oven at 200°C for 12 hours of heating reaction, cooled naturally to room temperature after the reaction, centrifuged the sample, and water Washed three times with ethanol, then freeze-dried to obtain NaYF 4 : Eu nanoparticles, the rare earth ion solution includes 95% Y by mass percent 3+ and 5% by mass of Eu 3+ .

[0034] (2) 10 mL of AEAPMS, 0.4 g of anhydrous citric acid and 10 mL of water were placed in a beaker and stirred for 15 minutes, and the mixture solution was transferred to a 50 mL Teflon-lined stainless steel autoclave and heated at 180 °C for 12 hours; Afterwards, the autoclaved mixture was cooled to r...

Embodiment 2

[0040] Use the NaYF gained in embodiment 1 4 :Eu@CDs composites for metal ion detection. First, we use various metal ion solutions such as Ag + , Al 3+ , Ca 2+ , Cd 2+ , Cr 2+ , Cu 2+ , Fe 2+ , Fe 3+ , Hg 2+ , K + , Li + , Mg 2+ , Mn 2+ , Na + , Ni + , Zn 2+ . In the detection experiment, the NaYF 4 :Eu@CDs nanocomposites were dispersed in an aqueous solution at a concentration of 10 mg / mL, and various metal ion solutions at a concentration of 400 μM were added to the solution. After homogeneous mixing, fluorescence measurements were performed with the same excitation. In a further experiment, prepare 10 mg / mL NaYF 4 : Eu@CDs nanocomposite solution with different concentrations of Fe 3+ (0μM-350μM). Fluorescence measurements were performed with excitation at 395 nm.

[0041] Figure 4 Different concentrations of Fe under 395nm laser excitation for this embodiment 3+ in NaYF 4 : Fluorescence spectra of Eu@CDs solution. The complex emits blue and red re...

Embodiment 3

[0043] Epoxy resin and NaYF obtained by mechanical stirring 4 : Mixture of Eu@CDs composites. The mixture was then carefully integrated on a UV-LED chip (395 nm), and WLEDs were obtained by drying at 60 °C for 4 h.

[0044] Figure 5 The use of 395nm chips combined with white light-emitting NaYF mentioned in this example 4 : Luminescence spectra of white LED lamps fabricated from Eu@CDs nanocomposites. In addition to the chip's 395nm emission, there are blue 465nm, red 589nm, 615nm and 695nm emissions. As can be seen from the inset, the LED lamp shows strong white light emission.

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Abstract

The invention belongs to the technical field of materials and discloses a NaYF 4 :Eu@CDs composite material and its preparation method and application. This method first synthesizes NaYF 4 : Eu, CDs solution and silica sol, mix the three, mechanically stir to form a composite material solution, dry and grind to form NaYF 4 :Eu@CDs composite particles. By modulating NaYF 4 : The ratio of Eu, CDs and silica sol can realize the change of luminous color from blue light to white light to red light under 395nm excitation, and effectively realize the control of luminous color. The present invention mainly utilizes the adjustment of the emission ratio of red light and blue light to realize the regulation of the emission spectrum. The preparation method provided by the invention has simple process, easy operation, low cost and environmental protection, and the obtained composite material particles have good stability. The composite material can meet the application requirements in different fields such as ion detection and white light LED lamps.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a NaYF 4 :Eu@CDs composite material and its preparation method and application. Background technique [0002] Multicolor luminescent materials have attracted increasing attention due to their potential applications in flexible full-color displays, multiple biomarkers, and next-generation light sources. It would be very beneficial to be able to obtain color modulation from the same luminescent composition under single wavelength excitation. In recent years, many multicolor luminescent materials have been developed, including rare earth metal-based nanoparticles, semiconductor quantum dots (QDs) polymer dots, molecular nanomaterials, and organic fluorescent dyes. However, low emission quantum yields (QYs), poor water solubility, possibility of photobleaching, and complicated preparation procedures hinder the practical application of these materials. Therefore, it is still challenging to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/77G01N21/64
CPCC09K11/7783G01N21/6428G01N2021/6432Y02B20/00
Inventor 庄健乐许晓凯刘应亮雷炳富张学杰胡超凡魏浩鹏
Owner SOUTH CHINA AGRI UNIV
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