NaYF4:Eu@CDs composite material, and preparation method and application thereof
A technology of composite materials and mixtures, applied in the field of materials, can solve problems such as PL annihilation, and achieve the effects of easy operation, high fluorescence and stability, and simple equipment.
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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 ...
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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