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a tio 2 :w nanoparticle, its preparation method and application

A nanoparticle and nanomaterial technology, applied in the field of fluorescent materials, can solve the problems of low luminous efficiency, small absorption cross section, narrow excitation spectral band, etc., and achieve the effects of simple preparation method, low cost and high synthesis efficiency

Active Publication Date: 2022-03-08
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in rare earth up-conversion luminescent materials, rare earth ions have the characteristics of small absorption cross-section, narrow excitation band and abundant intermediate state energy levels, which make the up-conversion luminescence efficiency low.
So far, people have tried a variety of methods to enhance the upconversion luminescence of rare earths, but there is still a certain distance from practical application

Method used

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  • a tio <sub>2</sub> :w nanoparticle, its preparation method and application
  • a tio <sub>2</sub> :w nanoparticle, its preparation method and application
  • a tio <sub>2</sub> :w nanoparticle, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A TiO-based 2 :W plasmon resonance effect enhanced method for upconversion luminescence, the steps are as follows:

[0043] (1) Add 1 mmol Ti(OEt) 4 , 0.15 mmol WCl 6 , 8 mL ODE, 0.5 mL OLA, 0.5 mL OA, 10 mmol ODAL and 0.8 mmol NH 4 F was mixed in a 50 mL three-necked flask.

[0044] (2) Step (1) The mixture was heated to 60 °C under nitrogen to start vacuuming, and heated to 110 °C under vacuum for 20 min.

[0045] (3) Step (2) The reaction mixture was rapidly heated to 280 °C in a nitrogen atmosphere and kept for 1 h.

[0046] (4) After the reaction in step (3), lower the temperature to 60 °C, add acetone and stir for 10 minutes, centrifuge at 8000 rpm for 3 minutes, disperse into n-hexane, and wash three times with n-hexane and acetone 1:1 (volume ratio) . Finally, the precipitate was dispersed in 25 mL of n-hexane to obtain TiO with a concentration of 0.04 mmol / mL 2 : W solution.

[0047] figure 1 It is the TiO synthesized in Example 1 2 : Transmission ele...

Embodiment 2

[0060] A TiO-based 2 : W plasmon resonance effect enhanced method for upconversion luminescence, the steps are as follows:

[0061] (1) Add 1 mmol Ti(OEt) 4 , 0.10 mmol WCl 6 , 8 mL ODE, 0.5 mL OLA, 0.5 mL OA, 10 mmol ODAL and 2 mmol NH 4 F was mixed in a 50 mL three-necked flask.

[0062] (2) Step (1) The mixture was heated to 60 °C under nitrogen to start vacuuming, and heated to 110 °C under vacuum for 20 min.

[0063] (3) Step (2) The reaction mixture was rapidly heated to 280 °C in a nitrogen atmosphere and kept for 1 h.

[0064] (4) After the reaction in step (3), lower the temperature to 60 °C, add acetone and stir for 10 minutes, centrifuge at 8000 rpm for 3 minutes, disperse into n-hexane, and wash three times with n-hexane and acetone 1:1 (volume ratio) . Finally, the precipitate was dispersed in 25 mL of n-hexane to obtain TiO with a concentration of 0.04 mmol / mL2 : W solution.

[0065] Figure 4 It is the TiO synthesized in Example 2 2 : Transmission elect...

Embodiment 3

[0078] A TiO-based 2 : W plasmon resonance effect enhanced method for upconversion luminescence, the steps are as follows:

[0079] (1) Add 1 mmol Ti(OEt) 4 , 0.10 mmol WCl 6 , 8 mL ODE, 0.5 mL OLA, 0.5 mL OA, 10 mmol ODAL and 2.6 mmol NH 4 F was mixed in a 50 mL three-necked flask.

[0080] (2) Step (1) The mixture was heated to 60 °C under nitrogen to start vacuuming, and heated to 110 °C under vacuum for 20 min.

[0081] (3) Step (2) The reaction mixture was rapidly heated to 280 °C in a nitrogen atmosphere and kept for 1 h.

[0082] (4) After the reaction in step (3), cool down to 60 °C, add acetone and stir for 10 minutes, centrifuge at 8000 rpm for 3 minutes, disperse into n-hexane, and wash three times with n-hexane and acetone 1:1 (volume ratio) . Finally, the precipitate was dispersed in 25 mL of n-hexane to obtain TiO with a concentration of 0.04 mmol / mL 2 : W solution.

[0083] Figure 7 It is the TiO synthesized in Example 1 2 : Transmission electron micr...

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Abstract

The invention discloses a TiO 2 The invention relates to W nanoparticles, their preparation method and application, which belong to the technical field of fluorescent materials. The TiO2:W nanoparticles of the present invention are obtained through the following process: (1) Ti(OEt) 4 , WCl 6 , octadecene, oleylamine, oleic acid, stearyl alcohol and ammonium fluoride to obtain a mixture; (2) The mixture is heated to 55~65°C under a nitrogen atmosphere to start vacuuming, and heated to 100~120°C under vacuum Keep for 10 min~30min; (3) Then raise the temperature to 270~290°C in a nitrogen atmosphere, and keep it warm for 0.5 h~1.5 h. After the reaction is completed, the system is lowered to 55~65°C, add acetone for precipitation, centrifuge, and wash the solid , that is. TiO prepared by the present invention 2 Combination of :W and up-conversion nanoparticles, the luminescence performance of up-conversion nanoparticles is effectively improved, up to 17 times.

Description

technical field [0001] The invention belongs to the field of fluorescent materials, in particular to a TiO-based 2 : W nanocrystal up-conversion luminescent material and its preparation method. Background technique [0002] Upconversion luminescence refers to the optical process of converting two or more low-energy photons into one high-energy photon. Rare-earth up-conversion luminescent materials have the advantages of rich spectrum, narrow emission spectrum, long luminous lifetime, and good optical stability. Application prospect. However, in rare earth upconversion luminescent materials, rare earth ions have the characteristics of small absorption cross section, narrow excitation band and abundant intermediate state energy levels, which make the upconversion luminescence efficiency low. So far, people have tried a variety of methods to enhance the upconversion luminescence of rare earths, but there is still a certain distance from practical application. Obtaining high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C09K11/02C09K11/85B82Y20/00B82Y30/00B82Y40/00
CPCC01G23/053C09K11/025C09K11/7773B82Y20/00B82Y30/00B82Y40/00C01P2004/03C01P2004/04C01P2006/60
Inventor 高惠平毛艳丽刘越峰金苏月
Owner HENAN UNIVERSITY