Up-conversion nanometer material with greatly enhanced red light and preparation method thereof

A nanomaterial, red light technology, applied in luminescent materials, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as the decline of luminous efficiency, and achieve the effect of eliminating surface defects

Active Publication Date: 2020-05-12
GUANGZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for Er 3+ Based on the upconversion nanomaterials, in addition to the energy transfer loss, there is a large part of the energy from Er 3+ Emitted, radiating to the outer space in the form of 980nm near-infrared photons, resulting in a decrease in luminous efficiency

Method used

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  • Up-conversion nanometer material with greatly enhanced red light and preparation method thereof
  • Up-conversion nanometer material with greatly enhanced red light and preparation method thereof
  • Up-conversion nanometer material with greatly enhanced red light and preparation method thereof

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Effect test

Embodiment 1

[0063] This embodiment provides a kind of NaErF 4 :0.5%Tm@NaYF 4 :25%Yb@NaYF 4 Preparation methods of upconversion nanomaterials.

[0064] (1)NaErF 4 : 0.5% Tm core layer preparation: put 6mL oleic acid and 15mL octadecene into a 100mL three-necked flask, mix and stir evenly. Then add 0.995mL concentration of 1mol L -1 Erbium chloride solution and 0.05mL concentration of 0.1mol L -1 Thulium chloride solution, mixed and stirred evenly, then heated up to 105°C and kept for 30min to remove water. Then the temperature was raised to 150°C and kept for 30 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 75 ° C and kept for 45 min , to remove excess methanol. Then, under the protection of argon, the temperature was raised to ...

Embodiment 2

[0068] This embodiment provides a kind of NaErF 4 :0.5%Tm@NaYF 4 :50%Yb@NaYF 4 Preparation methods of upconversion nanomaterials.

[0069] (1)NaErF 4 : 0.5% Tm core layer preparation: put 6mL oleic acid and 15mL octadecene into a 100mL three-necked flask, mix and stir evenly. Then add 0.995mL concentration of 1mol L -1 of erbium chloride solution and 0.05mL with a concentration of 0.1mol L -1 Thulium chloride solution, mixed and stirred evenly, then heated up to 105°C and kept for 30min to remove water. Then the temperature was raised to 150°C and kept for 30 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 75 ° C and kept for 45 min , to remove excess methanol. Then, under the protection of argon, the temperature was ...

Embodiment 3

[0073] This embodiment provides a kind of NaErF 4 :0.5%Tm@NaYF 4 :75%Yb@NaYF 4 Preparation methods of upconversion nanomaterials.

[0074] (1)NaErF 4 : 0.5% Tm core layer preparation: put 6mL oleic acid and 15mL octadecene into a 100mL three-necked flask, mix and stir evenly. Then add 0.995mL concentration of 1mol L -1 Erbium chloride solution and 0.05mL concentration of 0.1mol L -1 Thulium chloride solution, mixed and stirred evenly, then heated up to 105°C and kept for 30min to remove water. Then the temperature was raised to 150°C and kept for 30 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 75 ° C and kept for 45 min , to remove excess methanol. Then, under the protection of argon, the temperature was raised to ...

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Abstract

The invention belongs to the technical field of luminescent materials, and particularly relates to an up-conversion nanometer material with greatly enhanced red light and a preparation method thereof.A core layer of the up-conversion nanometer material adopts NaErF4 as a matrix, an Er ion as an active ion and sensitizing ion, and a Tm ion as an energy capture center, so the defect that energy migrates into crystal lattices is effectively eliminated. Furthermore, by coating of a layer of an NaYbF4 intermediate layer, near-infrared emission light having a wavelength of 980 nm andradiated from Er<3+> in the core layer is absorbed to the maximum extent; by coating of a layer of an NaYF4 passivation outer layer, the defect that energy migrates to the surface is effectively eliminated, the process of back transmission of energy from the NaYbF4 intermediate layer to the core layer is efficiently guided, energy level transition of Er<3+>: 4I15/2 to 4I11/2 and 4I13/2 to 4F9/2 in the core layeris initiated, and finally, high-strength high-purity red up-conversion luminescence is obtained. The up-conversion nanometer material is simple in preparation process, low in equipment cost, easy tooperate, short in preparation period and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to an up-conversion nano material with greatly enhanced red light and a preparation method thereof. Background technique [0002] Up-conversion luminescence refers to the conversion of two or more low-energy near-infrared excitation photons into high-energy visible or ultraviolet photons through the anti-Stokes process. Rare-earth-doped upconversion nanomaterials have attracted extensive attention of researchers due to their potential applications in solid-state lasers, anti-counterfeiting, temperature sensors, biological imaging, and solar cells. Compared with traditional fluorescent materials, rare earth-doped upconversion nanomaterials have the advantages of high chemical stability, long fluorescence lifetime and low biological toxicity. However, the low fluorescence efficiency greatly limits the practical application of upconversion nanomaterials. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/85B82Y20/00B82Y30/00
CPCC09K11/025C09K11/02C09K11/7773B82Y20/00B82Y30/00
Inventor 林浩
Owner GUANGZHOU UNIVERSITY
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