Abstract
Fluorescent optical fiber temperature sensors have attracted extensive attention due to their strong anti-electromagnetic interference ability, good high-voltage insulation performance, and fast response speed. The fluorescent material of the sensor probe directly determines the temperature measurement effect. In this paper, a new type of fluorescent material with a Mn2+-doped Ca2SiO4 phosphor (CSO:Mn2+) is synthesized via the solid-state reaction method at 1450 °C. The X-ray diffraction spectrum shows that the sintered sample has a pure phase structure, although the diffraction peaks show a slight shift when dopants are added. The temperature dependence of the fluorescence intensity and lifetime in the range from 290 to 450 K is explored with the help of a fluorescence spectrometer. Green emission bands peaking at 475 and 550 nm from Mn2+ are observed in the fluorescence spectra, and the intensity of emitted light decreases as the temperature rises. The average lifetime of CSO:Mn2+ is 17 ms, which is much higher than the commonly used fluorescent materials on the market. The fluorescence lifetime decreases with increasing temperature and shows a good linear relationship within a certain temperature range. The research results are of great significance to the development of a new generation of fluorescence sensors.
Highlights
According to different temperature measurement principles, there are three main types of thermometers: liquid thermometers based on thermal expansion of materials [2], thermocouple thermometers based on the Seebeck effect [3], and optical thermometers, including fluorescent temperature measurement systems [4]
Chi [28] developed a new type of fluorescent material with Mn2+ -doped ZnGeO4 and tested the fluorescence intensity and lifetime in the temperature range of 250 to 420 K; a maximum relative sensitivity of
The findings are of great significance to the development of a new generation of fluorescent optical fiber temperature sensors
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Chi [28] developed a new type of fluorescent material with Mn2+ -doped ZnGeO4 and tested the fluorescence intensity and lifetime in the temperature range of 250 to 420 K; a maximum relative sensitivity of. Sato et al [35] developed a Ca2 SiO4 :Eu2+ phosphor in 2014, whose fluorescence lifetime was 2.5 ms This phosphor realizes a broad spectrum of yellow light emission under 365 nm excitation, and with an increase of Eu2+ doping, the emission peak of the spectrum gradually shifts to red. Ca2 SiO4 (CSO) is used as the phosphor matrix, and a new type of fluorescent material (CSO:Mn2+ ) is synthesized by doping with the transition metal. The findings are of great significance to the development of a new generation of fluorescent optical fiber temperature sensors
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