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Ultrasensitive optical temperature sensing material and preparation method thereof

A technology for sensing materials and luminescent materials, applied in the field of preparation of optical temperature sensing materials, can solve problems such as low temperature sensitivity, and achieve the effects of simple synthesis method, easy surface modification, and good hydrophilicity

Active Publication Date: 2018-05-15
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art Ho 3+ and Yb 3+ Both rare earth ion-doped temperature sensing materials suffer from low temperature sensitivity (the highest value is 0.0064K -1 )

Method used

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  • Ultrasensitive optical temperature sensing material and preparation method thereof
  • Ultrasensitive optical temperature sensing material and preparation method thereof
  • Ultrasensitive optical temperature sensing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Press Gd 3+ / Yb 3+ / Ho 3+ / C 3+ = 68 / 15 / 1 / 16 mole percentage to configure 20mL rare earth solution, then press C 6 h 8 o 7 ·H 2 O / Ln 3+ = 1 / 1 molar ratio to add C 6 h 8 o 7 ·H 2 O.

[0029] Press F - / Ln 3+ =12 / 1 molar ratio configuration 20mLNaF solution, NaF solution was added dropwise to the rare earth solution under magnetic stirring. After continuing to stir for 20 minutes, transfer to a 50mL hydrothermal kettle.

[0030] After being kept at 200° C. for 12 hours, it was naturally cooled to room temperature, washed three times with deionized water, and then baked in an oven at 50° C. for 12 hours to obtain a white powder of the target product.

[0031] figure 1 is 68% NaGdF by mole percent 4 :15%Yb 3+ : 1% Ho 3+ : 16% Ce 3+ The XRD spectrum, all the diffraction peaks in the figure are related to the hexagonal phase NaGdF 4 The standard data (JCPDS No.27-0699) match well.

[0032] figure 2 It is the SEM photograph of the target powdery substan...

Embodiment 2

[0037] Press Gd 3+ / Yb 3+ / Ho 3+ / C 3+ =84 / 15 / 1 / 2 mole percentage to configure 20mL rare earth solution, then press C 6 h 8 o 7 ·H 2 O / Ln 3+ = 1 / 1 molar ratio to add C 6 h 8 o 7 ·H 2 O.

[0038] Press F - / Ln 3+=12 / 1 molar ratio configuration 20mLNaF solution, NaF solution was added dropwise to the rare earth solution under magnetic stirring. After continuing to stir for 20 minutes, transfer to a 50mL hydrothermal kettle.

[0039] After being kept at 200° C. for 12 hours, it was naturally cooled to room temperature, washed three times with deionized water, and then baked in an oven at 50° C. for 12 hours to obtain a white powder of the target product.

[0040] Figure 6 is 84% ​​NaGdF by mole percent 4 :15%Yb 3+ : 1% Ho 3+ : 2% Ce 3+ The XRD spectrum of the hexagonal NaGdF 4 The standard data (JCPDS No.27-0699) match well.

[0041] Figure 7 It is the SEM photo of the target powdery substance that the present embodiment obtains, and the shape and size of...

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Abstract

The invention discloses an ultrasensitive optical temperature sensing material and a preparation method. The optical temperature sensing material adopts a granular frequency up-conversion luminescentmaterial formed by doping Yb3+, Ho3+ and Ce3+ rare earth ions into a NaGdF4 matrix with a hexagonal symmetrical structure. The preparation method adopts a simple citric acid assisted hydrothermal method, and is mild in synthesis condition and simple in operation method. According to the method, ultrasensitive temperature detection capability can be obtained through the optimization of the doping concentrations of the rare earth ions.

Description

technical field [0001] The invention relates to the field of preparation of optical temperature sensing materials, in particular to an ultrasensitive optical temperature sensing material and a preparation method thereof. Background technique [0002] In recent years, the temperature sensing technology based on the relative intensity ratio of red and green up-conversion emission bands of rare earth ions has attracted great attention from researchers, because this sensing technology can realize non-contact temperature measurement, and is comparable to other technologies. Compared with other methods, this technology has inherent characteristics such as fast response, high sensitivity and self-referencing. [0003] Among rare earth ions, Er 3+ and Ho 3+ It is an important candidate element for the up-conversion luminescence center. At present, most research work focuses on Er 3+ Activated material. Er 3+ Thermally coupled energy levels ( 2 h 11 / 2 / 4 S 3 / 2 ) has an ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85G01K11/20
CPCC09K11/7773G01K11/20
Inventor 王嘉俊庞涛吕文辉
Owner HUZHOU TEACHERS COLLEGE