Core-shell structure up-conversion nano material and preparation method thereof
A nanomaterial, core-shell structure technology, applied in the field of red light-emitting core-shell structure up-conversion nanomaterials and their preparation, can solve problems such as concentration quenching, and achieve the effects of low equipment cost, easy operation, and short preparation period
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Embodiment 1
[0083] This embodiment provides a NaHoF 4 @NaGdF 4 :75%Tb@NaGdF 4 :49%Yb,1%Tm@NaYF 4 Preparation methods of upconversion nanomaterials.
[0084] (1)NaHoF 4 Nuclear layer preparation: put 15mL oleic acid and 20mL octadecene into a 100mL three-necked flask, mix and stir evenly. Then add 1mL concentration of 1mol L -1 Holmium chloride solution, mix and stir evenly, then raise the temperature to 105°C and keep it for 40min to remove water. Then the temperature was raised to 150°C and kept for 40 minutes to form a rare earth-oleic acid chelate. Then the temperature was naturally cooled to room temperature, 0.1 g of sodium hydroxide (2.5 mmol) and 0.148 g of ammonium fluoride (4 mmol) in methanol (10 mL in total) were added to the above mixture and stirred, then the temperature was raised to 90 °C and kept for 1 h , to remove excess methanol. Then, under the protection of argon, the temperature was raised to 280° C. for 1 h. Finally, the cloudy solution after the reaction w...
Embodiment 2
[0089] This embodiment provides a NaHoF 4 @NaGdF 4 :72%Tb@NaGdF 4 :45%Yb,0.7%Tm@NaYF 4 Preparation methods of upconversion nanomaterials.
[0090] (1)NaHoF 4 Nuclear layer preparation: put 13mL oleic acid and 20mL octadecene into a 100mL three-necked flask, mix and stir evenly. Then add 1mL concentration of 1mol L -1 Holmium chloride solution, mix and stir evenly, then raise the temperature to 95°C and keep it for 40min to remove water. Then the temperature was raised to 145° C. and kept for 40 minutes to form a rare earth-oleic acid chelate. Then the temperature was naturally cooled to room temperature, 0.1 g of sodium hydroxide (2.5 mmol) and 0.148 g of ammonium fluoride (4 mmol) in methanol (10 mL in total) were added to the above mixture and stirred, then the temperature was raised to 80 ° C and kept for 1 h , to remove excess methanol. Then, under the protection of argon, the temperature was raised to 270° C. for 1 h. Finally, the cloudy solution after the reacti...
Embodiment 3
[0095] This embodiment provides a NaHoF 4 @NaGdF 4 :78%Tb@NaGdF 4 :55%Yb,1.3%Tm@NaYF 4 Preparation methods of upconversion nanomaterials.
[0096] (1)NaHoF 4 Nuclear layer preparation: put 17mL oleic acid and 20mL octadecene into a 100mL three-necked flask, mix and stir evenly. Then add 1mL concentration of 1mol L -1 Holmium chloride solution, mix and stir evenly, then raise the temperature to 115°C and keep it for 40min to remove water. Then the temperature was raised to 155° C. and kept for 40 minutes to generate a rare earth-oleic acid chelate. Then the temperature was naturally cooled to room temperature, 0.1 g of sodium hydroxide (2.5 mmol) and 0.148 g of ammonium fluoride (4 mmol) in methanol (10 mL in total) were added to the above mixture and stirred, then the temperature was raised to 100 ° C and kept for 1 h , to remove excess methanol. Then, under the protection of argon, the temperature was raised to 290° C. for 1 h. Finally, the cloudy solution after the ...
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