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A kind of up-conversion fluorescent core-shell nanocrystal and its preparation method and application

A nanocrystalline and fluorescent technology, applied in the field of material science, can solve problems such as large temperature deviation

Active Publication Date: 2021-04-23
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Another problem faced by the fluorescence intensity ratio temperature measurement technology is that the laser heating effect caused by the excitation light source often causes an additional temperature rise of the measured object, resulting in a large deviation between the measured temperature and the actual temperature

Method used

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  • A kind of up-conversion fluorescent core-shell nanocrystal and its preparation method and application
  • A kind of up-conversion fluorescent core-shell nanocrystal and its preparation method and application
  • A kind of up-conversion fluorescent core-shell nanocrystal and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 8mmol of Brig-58, 6.4ml of n-butanol and 40ml of cyclohexane into the flask respectively, place in a 50°C water bath and stir evenly with magnetic force to obtain a colorless transparent reverse micellar system for future use. 5ml of BaCl with a concentration of 1 mol / L 2 The solution was added dropwise into the prepared reverse micelles system, and after stirring in a water bath at 50°C for 1 hour, BaCl was obtained 2 Microemulsion. In the same way, configure 10ml Er(NO 3 ) 3 , 10ml Yb(NO 3 ) 3 , 10ml Tm(NO 3 ) 3 , 70ml Gd(NO 3 ) 3 , 140ml Na 2 MoO 4 Microemulsion. 31.169ml BaCl 2 Microemulsion, 62.337ml Gd(NO 3 ) 3 microemulsion with 124.674 ml Na 2 MoO 4 After the microemulsion was mixed, 0.165 ml Er(NO 3 ) 3 , 1.65 ml Yb (NO 3 ) 3 and 16.5 μl Tm(NO 3 ) 3 Microemulsion, stirred at room temperature for 2 hours to form a white suspension; use propanol and absolute ethanol to sonicate, wash and centrifuge three times to obtain a precipitate, dr...

Embodiment 2

[0026] Add 8mmol of Brig-58, 6.4ml of n-butanol and 40ml of cyclohexane into the flask respectively, place in a 50°C water bath and stir evenly with magnetic force to obtain a colorless transparent reverse micellar system for future use. 5ml of BaCl with a concentration of 1 mol / L 2 The solution was dropped into the configured reverse micelles drop by drop, and BaCl was obtained after stirring in a water bath at 50°C for 1 h. 2 Microemulsion. In the same way, configure 10mlEr(NO 3 ) 3 , 10ml Yb(NO 3 ) 3 , 10ml Tm(NO 3 ) 3 , 70ml Gd(NO 3 ) 3 , 130ml Na 2 MoO 4 Microemulsion. 31.68ml BaCl 2 Microemulsion, 63.36 ml Gd(NO 3 ) 3 Microemulsion with 126.72ml Na 2 MoO 4 After the microemulsion was mixed, 0.165ml Er(NO 3 ) 3 , 0.99 ml Yb (NO 3 ) 3 and 0.165ml Tm(NO 3 ) 3 Microemulsion, stirred at room temperature for 2 hours to form a white suspension; use propanol and absolute ethanol to sonicate, wash, and centrifuge three times to obtain a precipitate, dry at 7...

Embodiment 3

[0029] Add 10.6 mmol of Brig-58, 7 ml of n-butanol and 53 ml of cyclohexane into the flask respectively, place in a water bath at 50°C and stir evenly with magnetic force to obtain a colorless transparent reverse micellar system for future use. 5ml of BaCl with a concentration of 1 mol / L 2 The solution was dropped into the configured reverse micelles drop by drop, and BaCl was obtained after stirring in a water bath at 50°C for 1 h. 2 Microemulsion. In the same way, configure 10ml Er(NO 3 ) 3 , 10ml Yb(NO 3 ) 3 , 10ml Tm(NO 3 ) 3 , 80ml Gd(NO 3 ) 3 , 160ml Na 2 MoO 4 Microemulsion. 37.372ml BaCl 2 Microemulsion, 74.743ml Gd(NO 3 ) 3 microemulsion with 149.486 ml Na 2 MoO 4 After the microemulsion was mixed, 0.42 ml Er(NO 3 ) 3 , 4.2ml Yb (NO 3 ) 3 and 8.4 μl Tm(NO 3 ) 3 The microemulsion was stirred at room temperature for 1.5h to form a white suspension; the precipitate was obtained after ultrasonication, washing, and centrifugation three times with isop...

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Abstract

The invention discloses an up-conversion fluorescent core-shell nanocrystal which can be used for temperature sensing and has a negative thermal quenching effect. The composition of the nanocrystal is Tm 3+ / Yb 3+ / Er 3+ :BaLn 2 (MoO 4 ) 4 @BaLn 2 (MoO 4 ) 4 (Ln=Gd,Y), whose crystal nucleus is composed of Tm 3+ / Yb 3+ / Er 3+ :BaLn 2 (MoO 4 ) 4 (Ln=Gd,Y), the outer surface of the crystal nucleus is covered with homogeneous BaLn 2 (MoO 4 ) 4 (Ln=Gd,Y) Shell. When the temperature rises from room temperature to 300°C, under the excitation of 980nm laser, the blue-green-red upconversion fluorescence intensity of the core-shell nanocrystals keeps increasing with the increase of temperature, showing negative fluorescence thermal quenching. Extinguish effect, can be reused after cooling down. Use Er 3+ The relationship between the fluorescence intensity ratio of ion thermal coupling energy level transition and temperature can realize temperature measurement.

Description

technical field [0001] The invention relates to an up-conversion fluorescent core-shell nanocrystal material with a negative thermal quenching effect that can be used for temperature sensing, and belongs to the technical field of material science. Background technique [0002] Temperature is one of the most basic physical parameters, and its measurement plays a vital role in human production and life, scientific research, and national defense and military industry. In recent years, in order to meet the needs of scientific and technological development, how to realize real-time temperature measurement of biological cells, micro-nano-scale device defects or electromagnetic interference environment has become one of the research focuses at home and abroad. At present, the fluorescence intensity ratio temperature measurement technology based on rare earth ion-doped nanocrystals has attracted widespread attention. It can effectively eliminate measurement errors caused by electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78C09K11/02B82Y20/00B82Y30/00B82Y40/00G01K11/32
CPCG01K11/32C09K11/02C09K11/7776B82Y20/00B82Y40/00
Inventor 雷若姗单杰锋黄飞飞华有杰王焕平邓德刚徐时清赵士龙
Owner CHINA JILIANG UNIV
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