Up-conversion light-emitting nano-crystal material, preparation method and applications thereof

A nanocrystalline and fluorescent technology, applied in nanotechnology, nanotechnology, nano-optics, etc., can solve the problems of probe material temperature calibration curve and temperature measurement performance change, temperature measurement error, etc., to shorten the ion distance and improve the energy level The effect of relevance

Active Publication Date: 2020-01-10
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, the fluorescence intensity ratio temperature measurement technology also faces the problem of changing the temperature calibration curve and temperature measurement performance of the probe material due to the fluctuation of the excitation light source power
For example, Li et al. found that when the 980nm laser excitation power was increased from 40mW to 100mW, CaWO 4 :Er 3+ / Yb 3+ The temperature calibration curve of the phosphor has changed significantly, which will lead to a temperature measurement error of up to 20°C (see Leipeng Li, et al. Optics letters, 2016, 41(7): 1458-1461)

Method used

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  • Up-conversion light-emitting nano-crystal material, preparation method and applications thereof
  • Up-conversion light-emitting nano-crystal material, preparation method and applications thereof
  • Up-conversion light-emitting nano-crystal material, preparation method and applications thereof

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Embodiment 1

[0026] Weigh Zr(NO 3 ) 4 aqueous solution and Nb(NO 3 ) 5 Aqueous solutions of 92.5 and 2ml each were placed in a beaker and stirred for 10 minutes, then 19.2g of citric acid was added and stirred at 40°C on a magnetic stirrer to completely dissolve the citric acid; then 0.5mol / L of Ho(NO 3 ) 3 Aqueous solution and Yb(NO 3 ) 3 The aqueous solutions were 0.5 and 5ml respectively, and then ammonia water was added to adjust the pH value to 6, and a transparent solution was formed after stirring evenly. Afterwards, the mixed solution was placed in a constant temperature oven and kept at 90° C. for 8 hours to obtain a transparent wet gel, and then heated to 120° C. for 8 hours to form a dry gel. The obtained gel was put into a corundum crucible, placed in a well-type furnace, and heated from room temperature to 300 °C at a rate of 5 °C / min, and kept for 2 h. After the self-propagating combustion reaction, the gel transformed into a white precursor. Grind the white precursor ...

Embodiment 2

[0037] Weigh Zr(NO 3 ) 4 and Nb(NO 3 ) 5 Each solution was 76.8 and 10ml, placed in a beaker and stirred for 10min, then added 38.4g of citric acid; stirred at 50°C on a magnetic stirrer to completely dissolve the citric acid; then added dropwise 0.5mol / L of Ho(NO 3 ) 3 and Yb(NO 3 ) 3 The solutions were 1.2 and 12ml respectively, and then ammonia water was added to adjust the pH value to 7, and a transparent solution was formed after stirring evenly. Afterwards, the mixed solution was placed in a constant temperature oven and kept at 80°C for 12 hours to obtain a transparent wet gel, and then heated to 140°C for 9 hours to form a dry gel. The obtained gel was put into a corundum crucible, placed in a well-type furnace, and heated from room temperature to 400 °C at a rate of 8 °C / min, and kept for 2 h. The gel transformed into a white precursor after completing the self-propagating combustion reaction. Grind the white precursor evenly and put it into a tube furnace. Und...

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Abstract

The invention discloses an up-conversion light-emitting nano-crystal material, a preparation method and applications thereof, wherein the material is Zr(1-x-y-z)HoxYbyNbzO2 tetragonal phase nano-crystal with a high-temperature fluorescence enhancement characteristic, x is 0.25-1.2%, y is 2.5-12%, z is 2-10%, x:y is 1:(10-40), and the nano-crystal is spherical particles with an average particle size of 7-10 nm. According to the invention, when the temperature rises from a room temperature to 413K, the green light (545 nm) and the red light (675 nm) emitted by the nano-crystal under the excitation of 980 nm laser show abnormal light emitting enhancement phenomena; the up-conversion light-emitting nano-crystal can be used for preparing a fluorescence high-temperature enhanced temperature probe, wherein the fluorescence high-temperature enhanced temperature probe can be used for temperature sensing, the temperature detection being not interfered by the excitation power fluctuation can be achieved through the relation between the fluorescence intensity ratio of red light to green light and the temperature, and the problems of temperature calibration curve changing and error increasing of the existing fluorescence temperature sensing material due to the light source are solved.

Description

technical field [0001] The invention relates to an up-conversion luminescent nanocrystal and its preparation method and application, belonging to the technical field of material science. Background technique [0002] In recent years, compared with conventional contact thermometers, fluorescent temperature sensors have attracted extensive attention due to their non-contact, high-precision temperature detection. Among them, the fluorescence intensity ratio temperature measurement technology based on rare earth doped nanocrystals measures temperature through the relationship between the intensity ratio and temperature of two fluorescence peaks with different temperature response characteristics, and has the advantages of anti-electromagnetic interference, remote monitoring, space With the advantages of high temperature resolution and fast response speed, it can meet the needs of micro-nano scale real-time temperature detection in the fields of life medicine, nanotechnology, ene...

Claims

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Application Information

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IPC IPC(8): C09K11/78G01K11/14B82Y20/00B82Y30/00
CPCC09K11/7769G01K11/14B82Y20/00B82Y30/00
Inventor 雷若姗王焕平黄飞飞邓德刚赵士龙杨清华徐时清
Owner CHINA JILIANG UNIV
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