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

Active Publication Date: 2021-04-30
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, NaHoF 4 base material due to the high concentration of Ho 3+ concentration quenching

Method used

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  • Core-shell structure up-conversion nano material and preparation method thereof
  • Core-shell structure up-conversion nano material and preparation method thereof
  • Core-shell structure up-conversion nano material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to a red-light-emitting core-shell structure up-conversion nano material and a preparation method thereof. According to the up-conversion nano material, NaHoF4 serves as a core layer, and is sequentially coated with a NaGdF4:Tb shell layer, a NaGdF4:Yb,Tm shell layer and a NaYF4 passivation layer, excitation energy is transmitted to the core layer from the second shell layer by sequentially utilizing energy migration between Gd<3+>:<6>P7/2 energy levels, energy migration between Tb<3+>:<5>D4 energy levels and interface energy transmission of Tb<3+>:<5>D4 energy levels to Ho<3+>:<5>S2/<5>F4 energy levels, and a cross relaxation effect (<5>S2/<5>F4+<5>I7-><5>F5+<5>I6) between Ho<3+> ions is caused so as to finally obtain NaHoF4-base up-conversion red light emission. The up-conversion nano material is simple in preparation process, short in period, low in equipment cost, simple to operate and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a core-shell structure up-conversion nano material emitting red light and a preparation method thereof. Background technique [0002] Photon upconversion refers to the anti-Stokes process that converts two or more low-energy photons into a single high-energy photon. Rare earth-doped upconversion nanomaterials have the advantages of high photochemical stability, long fluorescence lifetime, and low toxicity, and have great application prospects in the fields of biological imaging, optical temperature sensors, anti-counterfeiting, and 3D displays. Compared with the short-wavelength blue light and green light, the longer-wavelength red light (600-700nm) is known as the "biological window of visible light" because of its deeper penetration into biological tissues. As we all know, NaHoF 4 Based on upconversion nanomaterials have excellent performance in biom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
CPCC09K11/7773
Inventor 林浩郑雪刚
Owner GUANGZHOU UNIVERSITY
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