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High-temperature enhanced upconversion fluorescence type nanocrystal for temperature sensing and preparation method and application thereof

A nanocrystalline and fluorescent technology, applied in the field of materials science, can solve problems such as inability to achieve accurate detection and the difference in the probability of transition to the ground state.

Active Publication Date: 2015-02-25
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when related research develops Yb 3+ -Tm 3+ Temperature-sensing properties of co-doped upconversion nanocrystals discovered when their thermally coupled energy levels 3 f 3 and 3 h 4 Large differences in transition probabilities to the ground state prevent accurate detection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 0.2 mmol of yttrium acetate hexahydrate with a purity of 99.9%, 0.196 mmol of ytterbium acetate hexahydrate, and 0.004 mmol of thulium acetate hexahydrate, and place them in a three-necked flask, add 3 ml of oleic acid with a purity of 90%, 1-octadecene 7 ml, stir and heat at 150°C for 30 minutes; after cooling to room temperature, add 4.3 ml of methanol mixed solution of sodium hydroxide and ammonium fluoride, heat up to 50°C and heat for 30 minutes; heat up to 100°C, and wait for methanol to evaporate , feed argon, continue to heat up to 290°C, keep warm for 90 minutes and then cool down; precipitate with acetone, centrifuge, wash twice with cyclohexane and ethanol; dry the obtained precipitate at 60°C for 12 hours.

[0016] The above-mentioned nanocrystalline powder is detected by X-ray electron diffraction and is hexagonal sodium tetrafluoroyttrium with good crystallinity, and observed by transmission electron microscope, it is spherical particles with an avera...

Embodiment 2

[0018] Weigh 0.236 mmol of yttrium chloride hexahydrate with a purity of 99.9%, 0.16 mmol of ytterbium chloride hexahydrate, and 0.004 mmol of thulium chloride hexahydrate, and place them in a three-necked flask, add 3 ml of oleic acid with a purity of 90%, 1-deca Octacene 7 ml, stir and heat at 150°C for 30 minutes; after cooling to room temperature, add 4.3 ml of methanol mixed solution of sodium hydroxide and ammonium fluoride, heat up to 50°C and heat for 30 minutes; heat up to 100°C, wait After the methanol is volatilized, argon gas is introduced, and the temperature is continuously raised to 300°C, kept for 60 minutes and then cooled; precipitated with acetone, centrifuged, and washed twice with cyclohexane and ethanol; the obtained precipitate is dried at 60°C for 12 hours.

[0019] The above-mentioned nanocrystalline powder is detected by X-ray electron diffraction and is hexagonal sodium tetrafluoroyttrium with good crystallinity, and observed by transmission electron ...

Embodiment 3

[0021]Weigh 0.24 mmol of yttrium acetate hexahydrate with a purity of 99.9%, 0.156 mmol of ytterbium acetate hexahydrate, and 0.004 mmol of thulium acetate hexahydrate, and place them in a three-necked flask, add 7 ml of oleic acid with a purity of 90%, 1-octadecene 7 ml, stir and heat at 150°C for 30 minutes; after cooling to room temperature, add 4.3 ml of methanol mixed solution of sodium hydroxide and ammonium fluoride, heat up to 50°C and heat for 30 minutes; heat up to 100°C, and wait for methanol to evaporate , feed argon, continue to heat up to 290°C, keep warm for 90 minutes and then cool down; precipitate with acetone, centrifuge, wash twice with cyclohexane and ethanol; dry the obtained precipitate at 60°C for 12 hours.

[0022] The above nanocrystalline powder is detected by X-ray electron diffraction and is a hexagonal sodium tetrafluoroyttrium with good crystallinity. It is a rod-like structure with an average width of 25 nm and an average length of 47 nm by trans...

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Abstract

The invention relates to high-temperature enhanced upconversion fluorescence type nanocrystal for temperature sensing. The high-temperature enhanced upconversion fluorescence type nanocrystal for temperature sensing refers to hexagonal phase sodium yttrium tetrafluoride spherical or rod-shaped nanocrystal with the average diameter or length of 15-50nm, and rare earth Yb<3+> and Tm<3+> are co-doped into the nanocrystal. The nanometer powder is heated from room temperature to a temperature of 220 DEG C, the crystal structure and the surface structure are kept invariable, the index of the upconversion fluorescence intensity under laser excitation of 980nm is enhanced in an exponent manner along with the temperature, and the nanocrystal can be repeatedly used after temperature reduction. According to relation analysis between a fluorescence intensity ratio in ground state transition from Tm<3+> thermal coupling energy levels <3>F3 and <3>H4 and the temperature, temperature measurement can be performed.

Description

technical field [0001] The invention relates to a high-temperature enhanced up-conversion fluorescent nanocrystal that can be used for temperature sensing, and belongs to the technical field of material science. Background technique [0002] Based on luminescent materials doped with rare earth ions, optical temperature sensors that realize non-contact temperature measurement by exploring the correspondence between luminous intensity and temperature have received extensive attention in recent years, especially in special occasions where traditional electrical signal detection is limited. , this kind of fluorescent temperature-sensing materials will play an important role. At present, glass-ceramics, phosphor powders, and nanomaterials are commonly used as temperature sensing medium materials. Among them, temperature detection based on nanomaterials is dedicated to providing local temperature information with submicron resolution in a given system, such as applications in the...

Claims

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Application Information

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IPC IPC(8): C09K11/85B82Y20/00B82Y40/00G01K11/32
Inventor 周佳佳霍丽丽孙薪雯邹丹娜毛威徐时清张军杰
Owner CHINA JILIANG UNIV
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