Preparation for novel down-conversion infrared emission material
A new type of infrared emission technology, applied in luminescent materials, chemical instruments and methods, nanotechnology, etc., can solve the problems of inability to accurately detect and identify with infrared
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[0011] The invention provides a novel method for preparing a down-converting anti-counterfeiting material, which is characterized in that one or more of nanometer lead sulfide, lead selenide and lead telluride is used as a dispersant with pure water or an ethanol-based aqueous solvent, Then print the required pattern on the carrier by spraying and printing, and use the infrared signal identification chip to read to achieve the anti-counterfeiting effect. The excitation light is lower than the emission light, both of which can generate infrared luminescence.
[0012] In the present invention, lead acetate is used as lead source, thiourea is used as sulfur source, selenium dioxide is used as selenium source, tellurium powder is used as tellurium source, CATB is used as dispersant, sodium borohydride is used as precursor, and mercaptosuccinic acid is used as As a stabilizer, nanoparticles are prepared by a high-temperature hydrothermal method.
[0013] The preparation of nano-le...
Embodiment 1
[0023] Accurately weigh 1.524g of lead acetate and add it to the high-temperature reaction kettle, then add 80ml of deionized water and stir rapidly at room temperature in the heating mantle for 30min, then add 0.2g of CATB and 1.584g of thiourea in turn, stir well, mix evenly, and then set up the heating mantle temperature is 200 0 C. Stir and react for 1 hour, then turn off the agitator and let it stand for 4 hours, and finally turn off the heating mantle to cool to room temperature, then wash and dry with water.
[0024] Detected under the near-infrared spectrometer, the product absorption spectrum ranges from 300-500nm, and the emission characteristic spectrum is 550nm visible light and 1250nm near-infrared radiation. By changing the reaction temperature, stirring time and standing time, the emission characteristic spectrum can be controlled. It moves in the visible light range of 550nm-600nm and the near-infrared radiation range of 1250nm-1350nm.
Embodiment 2
[0026] A; Preparation of precursor NaHTe;
[0027] Accurately weigh 0.254g of sodium borohydride into a three-necked flask, then add 50ml of deionized water, stir and dissolve for 30min, then add 0.125g of tellurium powder, protect with nitrogen, and stir for 1 hour at room temperature.
[0028] B; configure lead acetate solution;
[0029] Accurately weigh 2.288 g of lead acetate and add it to a three-necked flask, pass nitrogen as an atmosphere protection, then add 200ml of deionized water and stir to dissolve for 30 minutes, then add 0.915g of mercaptosuccinic acid and continue stirring for 1 hour, and adjust with 1mol / L sodium hydroxide after completion The pH value of the solution was 10, and then stirred to disperse evenly.
[0030] Finally, set the temperature of the heating mantle to 100 0 C, the prepared precursor NaHTe was slowly added dropwise to the lead acetate solution at a rate of 1ml / min. After the dropwise addition was completed, it was reacted under the refl...
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