Temperature sensing material based on trivalent terbium and trivalent europium co-doping and preparation method and application thereof

Abstract

The invention provides a temperature sensing material based on co-doping of trivalent terbium and trivalent europium, which is characterized in that the chemical composition general formula of the temperature sensing material is Ba9Y1.94-xSi6O24: 0.06 Tb < 3 + >, xEu < 3 + >, x is a molar ratio coefficient of doped europium ions, and the value range is that x is more than or equal to 0.01 and less than or equal to 0.06; the temperature sensing material is prepared by adopting a high-temperature solid-phase method, has the characteristics of high sensitivity and high signal discrimination degree, and also has a wider temperature detection range.

Description

technical field [0001] The invention relates to the technical field of temperature sensing, in particular to a temperature sensing material based on trivalent terbium and trivalent europium co-doped and its preparation method and application. Background technique [0002] Temperature is a basic physical parameter that can reflect the basic state of substances and systems. Its accurate measurement is closely related to scientific research, industrial production, biological treatment, and meteorological monitoring. According to the environment and temperature distribution range of the measured object or system, different temperature measurement methods need to be used. Currently widely used temperature measurement methods include expansion temperature measurement, thermocouple temperature measurement, thermal resistance temperature measurement and radiation temperature measurement. Although the expansion type temperature measurement has a simple structure and low cost, it has...

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Problems solved by technology

The single-doped temperature-sensing phosphors that have been reported to have application prospects are mainly based on Er 3+ As the luminescence center, using Er 3+ Two thermally coupled energy levels ( 4 S 3 / 2 and 2 h 11 / 2 ) luminous intensity ratio to achieve the measurement of temperature, but these two thermally coupled energy levels are both green light with similar colors, it is difficult to directly reflect the change of temperature through color changes

[0004] In addition, the publication number is CN111534297A, and the comparison document titled "Three kinds of europium-terbium co-doped fluorescent probes based on different carboxylic acid ligands and the application of thin films in temperature sensing" records that "based on 4,4- Dicarboxydiphenyl ether-europium terbium co-doped, terephthalic acid-europium terbium co-doped, 4,4-biphenyl dicarboxylic acid-europium terbium co-doped three fluorescent probes, and the three fluorescent probes based on the thin films, and to find a new application for these three kinds of thin films”, discloses a fluorescent probe doped with europium and terbium, but the sensitivity of the fluorescent probe obtained in this patent document needs to be further improved. The temperature range that can be applied and detected is 25-200 ° C, and the research on temperature sensing materials higher than 200 ° C has not been reported; at the same time, in the above-mentioned published reference documents, rare earth ions are used as central ions, and then organic small molecules are added to them. Assemble to form a frame structure

Due to the small molecular organic components of this kind of component material, the disadvantage is that the thermal stability is not good, and the structure is easy to be damaged at high temperature and cannot be applied under high temperature conditions.

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