Double mode light-emitting water-based anti-counterfeiting ink, and preparation method and application thereof
A dual-mode, water-based technology, applied in applications, luminescent materials, chemical instruments and methods, etc., can solve the problems of poor anti-counterfeiting effect, easy imitation of anti-counterfeiting ink, and single luminescent color, so as to enhance anti-counterfeiting security and endow Long-term stability, the effect of simple preparation method
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[0041] The disclosure provides a preparation method of up-conversion nanoparticles, dissolving lanthanide metal salts in a mixed solution of oleic acid and octadecene, and preparing up-conversion nanoparticles (UCNP) and carbon quantum dots through pyrolysis. It has been confirmed by experiments that the up-conversion nanoparticles have the characteristics of down-conversion fluorescence, which emit blue fluorescence under the excitation of 365nm ultraviolet light, and the emission wavelength changes with the excitation wavelength, that is, as the excitation wavelength increases, the emission The position of the peak is red-shifted. This is due to the fact that carbon quantum dots are produced during the preparation of up-conversion nanoparticles, which have the characteristics of down-conversion fluorescence.
[0042] The third embodiment of the present disclosure provides an application of the above-mentioned dual-mode light-emitting water-based anti-counterfeiting ink in in...
Embodiment 1
[0045] Embodiment 1: Synthesis of NaGdF that emits green light 4 :Yb 3+ ,Er 3+ @NaGdF 4 nanoparticles.
[0046] Take Gd(CH 3 COO) 3 ·H 2 O (0.78mmol, 260.82mg), Yb (CH 3 CO 2 ) 3 4H 2 O (0.20mmol, 84.4mg) and Er (CH 3 CO 2 ) 3 4H 2 O (0.02mmol, 8.33mg) in a 100mL three-neck round bottom flask, add 10mL oleic acid as a stable ligand, 15mL 1-octadecene as a high boiling point solvent, and pass through N at 150°C 2 Stirred in an oil bath for 1 h under the conditions, the solution color turned into light yellow, and Ln 3+ - OA organometallic precursors. Cooled to room temperature, 0.4M 7.0mL NH 4 F methanol solution and 1.0M 3.0mL NaOH methanol solution are quickly mixed in a 15ml centrifuge tube, and quickly injected into the flask with a syringe (it must be injected into the flask quickly at this time, because NH 4 The NaF formed by the reaction of F and NaOH is very easy to stick to the wall of the centrifuge tube), the solution becomes cloudy rapidly, and the ...
Embodiment 2
[0048] Embodiment 2: Synthesis of blue-emitting NaGdF 4 :Yb 3+ ,Tm 3+ nanoparticles.
[0049] Take Gd(CH 3 COO) 3 ·H 2 O(1.494mmol, 499.58mg), Yb(CH 3 CO 2 ) 3 4H 2O (0.50mmol, 211mg) and Tm (CH 3 CO 2 ) 3 4H 2 O (0.006mmol, 2.07mg) in a 100mL three-necked round-bottom flask, add 10mL oleic acid as a stable ligand, 15mL 1-octadecene as a high boiling point solvent, and pass through N at 150°C 2 Stirred in an oil bath for 1 h under the conditions, the solution color turned into light yellow, and Ln 3+ - OA organometallic precursors. Cooled to room temperature, 0.4M 7.0mL NH 4 F methanol solution and 1.0M 3.0mL NaOH methanol solution are quickly mixed in a 15ml centrifuge tube, and quickly injected into the flask with a syringe (it must be injected into the flask quickly at this time, because NH 4 The NaF formed by the reaction of F and NaOH is very easy to stick to the wall of the centrifuge tube), the solution becomes cloudy rapidly, and the solution is passed ...
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