Mn4+-Doped Magnesium Titanate—A Promising Phosphor for Self-Referenced Optical Temperature Sensing

Phosphors based on magnesium titanate activated with Mn 4 + ions are of great interest because, when excited with blue light, they display a strong red-emitting luminescence. They are characterized by a luminescence decay which is strongly temperature dependent in the range from −50 ∘ C to 150 ∘ C,...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2018-02, Vol.18 (2), p.668
Main Authors: Venturini, Francesca, Baumgartner, Michael, Borisov, Sergey
Format: Article
Language:English
Subjects:
Fiber optics
Liquid phases
Luminescence
Magnesium titanates
Manganese
manganese, luminescence
Optical fibers
optical sensor
phosphor
Phosphors
Resistance thermometers
Response time
Temperature dependence
temperature sensor
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Summary:Phosphors based on magnesium titanate activated with Mn 4 + ions are of great interest because, when excited with blue light, they display a strong red-emitting luminescence. They are characterized by a luminescence decay which is strongly temperature dependent in the range from −50 ∘ C to 150 ∘ C, making these materials very promising for temperature sensing in the biochemical field. In this work, the optical and thermal properties of the luminescence of Mg 2 TiO 4 are investigated for different Mn 4 + doping concentrations. The potential of this material for temperature sensing is demonstrated by fabricating a fiber optic temperature microsensor and by comparing its performance against a standard resistance thermometer. The response of the fiber optic sensor is exceptionally fast, with a response time below 1 s in the liquid phase and below 1.1 s in the gas phase.
ISSN:1424-8220
1424-8220
DOI:10.3390/s18020668