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A kind of up-conversion luminescent nanocrystal and its preparation method and application

A nanocrystalline and fluorescent technology, applied in luminescent materials, nanotechnology, nano optics, etc., can solve problems such as temperature measurement errors, temperature calibration curves of probe materials, and changes in temperature measurement performance, so as to improve energy level correlation and shorten The effect of ion spacing

Active Publication Date: 2022-02-22
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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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 luminescent nanocrystalline material, a preparation method and application thereof. The material is Zr with high-temperature fluorescence enhancement characteristics. (1‑x‑y‑z) Ho x Yb y Nb z O 2 Tetragonal nanocrystals, wherein x=0.25~1.2%, y=2.5~12%, z=2~10%, x:y=1:(10~40), and the nanocrystals have an average particle size of 7~10nm spherical particles. When the temperature was raised from room temperature to 413K, the green light (545nm) and red light (675nm) emitted by the nanocrystals under the excitation of 980nm laser exhibited abnormal luminescence enhancement. The up-conversion luminescent nanocrystal of the present invention can be used to prepare a fluorescent high-temperature enhanced temperature probe, and the fluorescent high-temperature enhanced temperature probe can be used for temperature sensing. The temperature detection that is not disturbed by the fluctuation of excitation power can be realized, and the problems of the existing fluorescent temperature sensing materials that the temperature calibration curve is changed and the error is increased 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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Patent Type & Authority Patents(China)
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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