Europium ion multivalent double-center optical temperature probe material

Abstract

The invention discloses a europium ion multivalent double-center optical temperature probe material BaAl2B2O7: Eu < 2 + > / Eu < 3 + >, the material is prepared by a high-temperature solid-phase carbon thermal reduction method, Eu < 3 + > is partially reduced by carbon powder, two luminescence centers of Eu < 3 + > and Eu < 2 + > are obtained, and the fluorescent temperature measurement material has a self-calibration characteristic. The material can simultaneously generate a plurality of characteristic emission peaks of Eu < 2 + > and Eu < 3 + > under the excitation of ultraviolet light, the strongest emission peaks of Eu < 2 + > and Eu < 3 + > are respectively positioned at 375nm and 613nm, and the temperature is calibrated by monitoring the two characteristic emission peaks and utilizing a fluorescence intensity ratio technology. The temperature detection material has the advantages of high absolute sensitivity (Sa: 0.023 K <-1 >) and relative sensitivity (Sr: 3.505% K <-1 >), wide temperature measurement range (303K-503K), high signal resolution and the like, and can be applied to non-contact temperature measurement.

Description

technical field [0001] The invention belongs to the field of non-contact optical temperature measurement materials, and in particular relates to a preparation method and application of a novel self-calibrating fluorescent temperature probe material. Background technique [0002] In recent years, new non-contact optical temperature detection materials have become the focus of attention and research because of their fast response speed and no damage. Some optical properties of luminescent materials, such as peak position, fluorescence intensity ratio, spectral linewidth, and fluorescence lifetime, change regularly with temperature, and these properties are also repeatable, so they can be used Changes in these optical properties are used to monitor temperature. Among them, the fluorescence intensity ratio temperature measurement technology can effectively avoid measurement errors caused by factors such as fluorescence loss and excitation light source intensity fluctuations dur...

AI Technical Summary

Problems solved by technology

However, the temperature measurement sensitivity of this type of optical temperature detection material based on the difference in the thermal coupling energy level of rare earth ions is limited by the energy level difference in the thermal coupling energy level of rare earth ions, which cannot take into account the excellent temperature measurement sensitivity and signal discrimination ability.

[0004] The temperature probe material constructed by utilizing the differences in luminescence thermal quenching of different rare earth ions can effectively improve the temperature measurement sensitivity of the probe material while ensuring high signal discrimination, but there are certain limitations in obtaining two different types of luminescence centers in a single matrix. Therefore, it is of great significance to find suitable active ions and matrix materials for the development of high-performance fluorescent temperature sensing materials with dual luminescent centers.

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