Scandium-based rare earth luminescence material and preparation method thereof

A technology of rare earth luminescence and scandium salt, applied in luminescent materials, chemical instruments and methods, inks, etc., can solve the problems of luminous intensity quenching and low luminous intensity, achieve increased asymmetry, simple preparation method, and good reversibility Effect

Inactive Publication Date: 2019-05-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the problem to be solved in the present invention is that the luminous intensity of UCNPs material is low, and the luminous intensity is quenched by the influence of temperature rise, and at the same time, the application range

Method used

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  • Scandium-based rare earth luminescence material and preparation method thereof
  • Scandium-based rare earth luminescence material and preparation method thereof
  • Scandium-based rare earth luminescence material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 0.64mmol (0.1660g) of ScCl 3 ·6H 2 O, 0.144 mmol (0.0558 g) of YbCl 3 ·6H 2 O and 0.016mmol (0.0042g) ErCl 3 Add 15 mL of deionized water, stir vigorously for 15 minutes, add 0.1 g of polyvinylpyrrolidone, continue stirring for 30 minutes, and then add 1.2 mmol (0.3958 g) of Na 2 WO 4 2H 2 O, stir, adjust the pH to 5 with 3mol / L HCl, continue to stir for 30 minutes, then transfer all the white solution to a 25mL polytetrafluoroethylene reactor, put it into an oven, and react at 180°C for 12 hours. After the reaction was completed, the obtained white precipitate was centrifuged three times with deionized water. Dry at 70°C for 6 hours to obtain a white powder, then put it into a muffle furnace and anneal at 800°C for 2 hours to obtain Sc 2 (WO 4 ) 3 : Yb / Er white powder, wherein, the doping mole fraction of Yb is 18%, and the mole fraction of Er doping is 2%. The scanning electron microscope photo of the obtained powder is shown in figure 1 , X-ray diffraction...

Embodiment 2

[0044] 0.3mmol (0.0693g) of Sc(NO 3 ) 3 , 0.04mmol (0.0144g) of Yb (NO 3 ) 3 and 0.06mmol (0.0212g) Er (NO 3 ) 3 Add 15 mL of deionized water, stir vigorously for 15 minutes, add 0.3 g of polyvinylpyrrolidone, continue stirring for 30 minutes, then add 0.6 mmol (0.157 g) of Li 2 WO 4 , stirring, with 3mol / L of H 2 SO 4 Adjust the pH to 5, continue to stir for 30 minutes, then transfer all the white solution to a 25mL polytetrafluoroethylene reactor, and put it in an oven at 160°C for 35 hours. After the reaction was completed, the obtained white precipitate was centrifuged three times with deionized water. Dry at 70°C for 6 hours to obtain a white powder and put it into a muffle furnace for annealing at 400°C for 5 hours to obtain Sc 2 (WO 4 ) 3 : Yb / Er white powder, wherein the mole fraction of Yb doped is 1%, and the mole fraction of Er doped is 15%.

Embodiment 3

[0046] 0.432mmol (0.0959g) of Sc(CH 3 COO) 3 , 0.12mmol (0.0507g) of Yb(CH 3 COO) 3 and 0.048mmol (0.02g) Er (CH 3 COO) 3 Add 15 mL of deionized water, stir vigorously for 15 minutes, add 1 g of polyvinylpyrrolidone, continue stirring for 30 minutes, and then add 0.9 mmol (0.2934 g) of K 2 WO 4 , stirred, with 3mol / L HNO 3 Adjust pH to 5. Stirring was continued for 30 minutes, and then all the white solution was transferred to a 25mL polytetrafluoroethylene reactor, and placed in an oven at 220°C for 6 hours. After the reaction was completed, the obtained white precipitate was centrifuged three times with deionized water. Dry at 70°C for 6 hours to obtain a white powder and put it into a muffle furnace for 12 hours at 500°C to obtain Sc 2 (WO 4 ) 3 : Yb / Er white powder, wherein the Yb doped mole fraction is 20%, and the Er doped mole fraction is 8%.

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Abstract

The invention provides a scandium-based rare earth luminescence material and a preparation method thereof, and aims to solve the problems that a UCNPs material is low in illumination intensity, and the illumination intensity is quenched by influence of rising temperature. The preparation method is simple, the prepared scandium-based rare earth luminescence material Sc2(WO4)3:Yb/Er has wide luminescence temperature range, luminescence temperature can reach up to 1073K, and heat quenching effects are effectively overcome. When the scandium-based rare earth luminescence material prepared by the preparation method is applied into high-temperature fake prevention, the luminescence material has excellent heat stability, luminescence of the material is enhanced along with rising of the temperature within temperature intervals of 293K-1073K, and corresponding light with determined luminescence intensity is generated in temperature spots. The application range of UCNPs is widened, so that the UCNPs can be widely applied to the fields of luminescence from indoor temperature to high temperature such as high-temperature fake prevention and fluorescence thermometers.

Description

technical field [0001] The invention relates to the technical field of photoelectric functional materials, in particular to a scandium-based rare earth luminescent material and a preparation method thereof. Background technique [0002] Up-conversion luminescence, that is, anti-Stokes luminescence, emits high-energy photons by continuously absorbing two or more low-energy excitation photons. Rare earth ion-doped up-conversion luminescent materials (UCNPs) can achieve up-conversion luminescence under the excitation of an external laser, and have the advantages of good luminescence stability, long fluorescence lifetime, and narrow emission spectral band. extensive attention and research. Because of the above advantages, UCNPs have a wide range of applications in 3D display, photocatalysis, photovoltaics, drug delivery and therapy, and bioimaging. [0003] However, UCNPs also have some problems: (1) the luminous intensity of the material itself is relatively low; (2) the exte...

Claims

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Application Information

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IPC IPC(8): C09K11/78C09D11/50
Inventor 黄岭魏阳潘岳周洁宋浩谢小吉
Owner NANJING UNIV OF TECH
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