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Up-conversion photoluminescence and photothermal conversion difunctional nanocrystal material and synthesis method thereof

A nanocrystal, multifunctional technology, applied in the field of upconversion luminescence and photothermal conversion multifunctional nanocrystalline materials and their preparation, can solve the problems of affecting the luminescence performance of crystal conversion, difficult to remove surfactants, etc., and achieve good upconversion luminescence. performance and effect of photothermal conversion performance

Active Publication Date: 2021-11-23
ZHENGZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the present invention provides a preparation method for a new multifunctional nanocrystal material with up-conversion luminescence and photothermal conversion, which overcomes the need to use surfactants to inhibit the growth of crystal nuclei in the synthesis of bimetallic molybdate nanocrystals in the prior art. The technical problem that the active agent is difficult to remove and affects the crystal up-conversion luminescence performance

Method used

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  • Up-conversion photoluminescence and photothermal conversion difunctional nanocrystal material and synthesis method thereof
  • Up-conversion photoluminescence and photothermal conversion difunctional nanocrystal material and synthesis method thereof
  • Up-conversion photoluminescence and photothermal conversion difunctional nanocrystal material and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 NaGd 0.897 Yb 0.1 T m 0.003 (MoO 4 ) 2 preparation of

[0031] Weigh Gd(NO 3 ) 3 ·6H 2 O(5mmol), Yb(NO 3 ) 3 ·5H 2 O (0.5mmol), Tm (NO 3 ) 3 ·6H 2 O (0.15mmol) (purity 99.99%) was added to 10ml deionized water, magnetically stirred until uniformly dissolved; 12.5ml absolute ethanol was added dropwise, and magnetic stirring continued; dropwise added 10mmol Na 2 MoO 4 2H 2 O (analytical pure) aqueous solution (deionized water configuration), continue to stir for 2 hours to form a 40ml precursor solution; move the precursor solution into a Teflon-lined stainless steel autoclave with a total volume of 50ml, seal it and place it at 180°C Heat in an oven for 12 hours; after cooling to room temperature, collect the precipitate in the reaction kettle by centrifugation and alternate washing with ethanol and deionized water; put the washed precipitate into a beaker and dry it in an oven at 80°C 6 hours to get NaGd 0.897 Yb 0.1 T m 0.003 (MoO 4 ) 2 ....

Embodiment 2-5

[0032] The influence of embodiment 2-5 ethanol dosage on crystal growth

[0033] The amount of replacing absolute ethanol is 5ml, 7.5ml, 10ml and 15ml, and all the other operations are the same as in Example 1.

[0034] like figure 1 Shown, the NaGd prepared by the present invention 0.897 Yb 0.1 T m 0.003 (MoO 4 ) 2 Nanocrystals and NaGd(MoO 4 ) 2 (ICDD 25-0828) Standard Diffraction Figure 1 consistent, indicating that all synthesized samples were phase-pure NaGd(MoO 4 ) 2 . Due to the similar ionic radius of the lanthanides, the activator Yb 3+ / Tm 3+ Easily replaces Gd 3+ site. The peak value of the sample synthesized in Example 1 was lower than that of the samples synthesized in Examples 2-5 when the amount of ethanol was 12.5ml, which means that the sample in Example 1 had lower crystallinity or smaller grain size.

[0035] like figure 2 Shown, show according to SEM image, the NaGd prepared in embodiment 1 0.897 Yb 0.1 T m 0.003 (MoO 4 ) 2 Nanocrysta...

Embodiment 6-7

[0038] Example 6-7 Tm 3+ Effect of doping concentration on upconversion luminescent properties of nanocrystals.

[0039] Replace Tm 3+ Doping concentration, all the other operations are the same as in Example 1, respectively prepare and obtain NaGd 0.899 Yb 0.1 T m 0.001 (MoO 4 ) 2 , NaGd 0.895 Yb 0.1 T m 0.005 (MoO 4 ) 2 .

[0040] Depend on Figure 5 It can be seen that under 980nm excitation, the three NaGd x Yb y T m z (MoO 4 ) 2 The nanocrystals emit bright blue light. with different Tm 3+ Among the three samples with doping concentration, NaGd 0.897 Yb 0.1 T m 0.003 (MoO 4 ) 2 Nanocrystals exhibit the strongest luminescence. Several emission peaks were found in the spectra of all three samples, with emission bands at 796 and 807 nm in the invisible near-infrared region. The blue emission band centered at about 474 nm is located in the visible region, which could explain the bright blue emission from the sample. Further replacement of Yb 3+ dopi...

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Abstract

The invention relates to an up-conversion photoluminescence and photothermal conversion bifunctional nanocrystal material and a synthesis method thereof. The material component is a NaGd(MoO4)2 nanocrystal NaGdxYbyTmz(MoO4)2 doped with Yb<3+> and Tm<3+>. The nanocrystal material is synthesized by a surfactant-free ethanol-water system solvothermal method. Under 980nm laser excitation, the nano material can realize up-conversion visible light emission and photothermal conversion at the same time, and can be applied to the fields of photodynamic therapy, biomedical imaging and the like.

Description

technical field [0001] The invention belongs to the field of optical functional nanomaterials and technologies, and more specifically relates to an upconversion luminescence and photothermal conversion multifunctional nanocrystal material and a preparation method thereof. Background technique [0002] The up-conversion luminescence of lanthanide doped ions has shown high application value in many fields such as biomedical imaging, diagnosis and treatment, optical super-resolution imaging, temperature sensing, and fingerprint display. However, there are few reports on bifunctional nanocrystals with upconversion photoluminescence and photothermal conversion. Double metal molybdates are a kind of oxo-salt inorganic materials. They have high physical and chemical stability, low system phonon energy, and wide absorption and emission cross-sectional areas, so they are often used as host lattice materials for lanthanide luminescence. Inorganic nanocrystalline materials are mostly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78B82Y20/00B82Y40/00A61K41/00G01N21/64
CPCC09K11/7776B82Y20/00B82Y40/00A61K41/0057G01N21/6428
Inventor 李安明李昭涵王志文陈建军
Owner ZHENGZHOU NORMAL UNIV
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