Multi-parameter temperature prediction based on optical fiber filled with CsPbX3 QDs

Shiyezi Xiang,Zikai Jiang,Weigen Chen,Zhixian Zhang,Fu Wan,Lin Du,Feng Zhou

doi:10.1063/5.0077414

Abstract

To expand the range of application of quantum dots in the field of temperature sensing, this paper proposed three kinds of temperature sensors based on CsPbX3 (X = Br, Br/I, and I) quantum dots filling into hollow-core fibers. Based on the photoluminescence properties of quantum dots, quantum dots were prepared by the hydrothermal method and later filled in hollow-core optical fibers to fabricate three kinds of temperature sensors. In this paper, the temperature dependence of photoluminescence of quantum dot sensors has been studied. In detail, temperature variation characteristics of integrated photoluminescence, full width at half maximum, and central wavelength of the photoluminescence spectrum have been investigated. It is found that the integrated photoluminescence, full width at half maximum, and central wavelength all fluctuate regularly with temperature. In this paper, the support vector regression method is employed to determine the mathematical relation between integrated photoluminescence, full width at half maximum, central wavelength, and temperature. Later, the three parameters are used to achieve fast and accurate temperature measurement. The experimental results show that in the range of 30–100⁡°C, the precision of the optical fiber temperature sensors based on quantum dots is below 2⁡°C.

Highlights

This stems from the fact that the cubic phase of CsPbI3 quantum dots (QDs) is only stable at high temperatures and the crystalline transformation process will happen at room temperature
This research was conducted to design optical fiber temperature sensors based on CsPbX3 (X = Br, Br/I, and I) QDs and establish a multi-parameter temperature quantitative method
The results of this study show that with the increase in temperature, the integrated PL of the three sensors decreases, the full width at half maximum (FWHM) increases nearly linearly, and the PL spectrum is slightly blue-shifted

Summary

Introduction

AS a kind of semiconductor nanocrystalline material, quantum dots (QDs) have achieved great success due to their high fluorescence efficiency, good optical stability, long fluorescence lifetime, broadband absorption spectrum, and narrow emission spectrum. QDs have been extensively used in optoelectronic fields, such as solar cells, light-emitting diodes, fluorescent probes, lasers, and so on. Besides the above-mentioned applications, QDs have other potential research values, one of which is the temperature dependence of photoluminescence (PL). There is significant potential for QDs to be temperature sensors due to the temperature-dependent luminescent properties.It has been reported that Walker et al studied the PL properties of CdSe/ZnS QDs with the temperature changing from 100 to 315 K.11 Disk-shaped CdSe/ZnS QDs were put on heat conduction oil, and PL was measured by heating the heat conduction oil. AS a kind of semiconductor nanocrystalline material, quantum dots (QDs) have achieved great success due to their high fluorescence efficiency, good optical stability, long fluorescence lifetime, broadband absorption spectrum, and narrow emission spectrum.. QDs have been extensively used in optoelectronic fields, such as solar cells, light-emitting diodes, fluorescent probes, lasers, and so on.. Besides the above-mentioned applications, QDs have other potential research values, one of which is the temperature dependence of photoluminescence (PL).. There is significant potential for QDs to be temperature sensors due to the temperature-dependent luminescent properties. It has been reported that Walker et al studied the PL properties of CdSe/ZnS QDs with the temperature changing from 100 to 315 K.11. Disk-shaped CdSe/ZnS QDs were put on heat conduction oil, and PL was measured by heating the heat conduction oil.

Methods

Results

Conclusion