A high-sensitivity fluorescent temperature-measuring material and its preparation method

A high-sensitivity, fluorescent technology, used in luminescent materials, chemical instruments and methods, thermometers, etc., can solve the problems of low luminous intensity, long calcination time, and high energy consumption.

Active Publication Date: 2021-05-14
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation of rare earth ions Re 3+ doped Sr 2 CeO 4 For powder, the powder prepared by traditional high-temperature solid-phase method and chemical co-precipitation method coexists with various miscellaneous items, such as SrO, SrCO 3 , SrCeO 3 , Ce 2 Sr 2 o 5 etc., it is difficult to obtain a pure phase, and the luminous intensity is generally not high, resulting in low sensitivity of the temperature measuring material, which has a great impact on the performance of the material, and the operation is complicated, the calcination temperature is high, the calcination time is long, and the energy consumption is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Preparation (Er 0.001 Sr 0.999 ) 2 CeO 4

[0022] A method for preparing a high-sensitivity fluorescent temperature-measuring material, comprising the following steps:

[0023] (1) According to the general chemical formula (Er 0.001 Sr 0.999 ) 2 CeO 4 The stoichiometric ratio of each element, accurately weighed Sr with a purity greater than 99.99% 2 (NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Er(NO 3 ) 3 ·5H 2 O raw material, formulated to contain Sr 2+ 、Ce 3+ 、Er 3+ mixed salt solution A, adding AgNO with a purity greater than 99.99% 3 , Ag + with Er 3+ The molar ratio is 1:1, heated and stirred at 30°C to obtain mixed salt solution B;

[0024] (2) Add citric acid to the mixed salt solution B, wherein the number of moles of citric acid is 4 times of the total number of moles of metal ions; the heating temperature is raised to 80° C., stirring continuously, and the water volatilizes until a transparent gel is formed;

[0025] (3) heat the gel o...

Embodiment 2

[0029] Embodiment 2: Preparation (Er 0.02 Sr 0.98 ) 2 CeO 4

[0030] A method for preparing a high-sensitivity fluorescent temperature-measuring material, comprising the following steps:

[0031] (1) According to the general chemical formula (Er 0.02 Sr 0.98 ) 2 CeO 4 The stoichiometric ratio of each element, accurately weighed Sr with a purity greater than 99.99% 2 (NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Er(NO 3 ) 3 ·5H 2 O raw material, formulated to contain Sr 2+ 、Ce 3+ 、Er 3+ mixed salt solution A, adding AgNO with a purity greater than 99.99% 3 , Ag + with Er 3+ The molar ratio is 1:1, heated and stirred at 50°C to obtain mixed salt solution B;

[0032] (2) Add citric acid to the mixed salt solution B, wherein the number of moles of citric acid is 5 times of the total number of moles of metal ions; the heating temperature is raised to 70° C., stirring continuously, and the water volatilizes until a transparent gel is formed;

[0033] (3) heat the gel obtai...

Embodiment 3

[0037] Embodiment 3: preparation (Er 0.01 Sr 0.99 ) 2 CeO 4

[0038] A method for preparing a high-sensitivity fluorescent temperature-measuring material, comprising the following steps:

[0039] (1) According to the general chemical formula (Er 0.01 Sr 0.99 ) 2 CeO 4 The stoichiometric ratio of each element, accurately weighed Sr with a purity greater than 99.99% 2 (NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Er(NO 3 ) 3 ·5H 2 O raw material, formulated to contain Sr 2+ 、Ce 3+ 、Er 3+ mixed salt solution A, adding AgNO with a purity greater than 99.99% 3 , Ag + with Er 3+ The molar ratio is 1:1, heated and stirred at 40°C to obtain mixed salt solution B;

[0040] (2) Add citric acid to the mixed salt solution B, wherein the number of moles of citric acid is twice the total number of moles of metal ions; the heating temperature is raised to 75° C., stirring continuously, and the water volatilizes until a transparent gel is formed;

[0041] (3) Place the gel obtained ...

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Abstract

The invention discloses a high-sensitivity fluorescent temperature-measuring material and a preparation method thereof. The chemical formula of the material is: (Er x Sr 1‑x ) 2 CeO 4 , where the rare earth ion Er 3+ The range of the doping amount x is 0.1mol%≤x≤2.0mol%; the present invention utilizes Er 3+ The down-conversion luminescence phenomenon generated under the excitation of ultraviolet light, which is incorporated into Sr 2 CeO 4 In, and introduce Ag + As a structure stabilizing and charge compensating agent, the pure phase powder was rapidly prepared by the sol-gel method using citric acid as a complexing agent. The material of the present invention has high luminous intensity and stable performance. It is irradiated with ultraviolet light (250-350nm) and utilizes Er 3+ It emits strong green light (located at 545-550nm), which can reach 0.5-0.7% / K according to the change of its luminous intensity with the ambient temperature. It has high sensitivity, and the production cycle is controllable, easy to operate, and can Small consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials application, and in particular relates to a high-sensitivity fluorescent temperature-measuring material and a preparation method thereof. Background technique [0002] The development of photonics has made great progress in the research of luminescent materials. One of the main concerns of researchers is blue phosphors, screen materials, RGB white light-emitting devices and optoelectronic devices. Commercial green and red phosphors widely use rare earth (RE 3+ )Luminescent material. Among them, in the 1990s, Sr 2 CeO 4 It is considered as a matrix material for high-efficiency blue phosphors. [0003] Sr was first reported by Danielson in 1998 2 CeO 4 , which is prominently shown as having a strong emission in the blue light region, and also has high stability under high-energy radiation. Subsequent studies have shown that this material can also exhibit strong photoluminescenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78G01K11/20
CPCC09K11/7768G01K11/20
Inventor 张乐甄方正顾灵诚周天元高光珍王骋陈浩
Owner XUZHOU NORMAL UNIVERSITY
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