In Situ Synthesis of β-Na1.5Y1.5F6: Er3+ Crystals in Oxyfluoride Silicate Glass for Temperature Sensors and Their Spectral Conversion and Optical Thermometry Analysis.

Rajesh Dagupati,José J Velázquez,Robert Klement,Dušan Galusek,Ramaraghavulu Rajavaram

doi:10.3390/molecules26226901

Rajesh Dagupati, José J Velázquez + Show 3 more

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https://doi.org/10.3390/molecules26226901

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Abstract

Transparent oxyfluoride glass-ceramics (GCs) with embedded β-Na1.5Y1.5F6 crystals doped with Er3+ ions were fabricated by a melt-quenching method with subsequent heat-treatment. The structural characterizations and spectroscopic techniques were performed to verify the precipitation of β-Na1.5Y1.5F6 crystals and partition of the Er3+ dopant into the crystals. Bright green up-conversion (UC) emission was achieved in Er3+-doped glass-ceramic (Er-GC). Furthermore, the temperature-dependent visible UC behavior based on thermally coupled energy levels (TCLs) and non-thermally coupled energy levels (NTCLs) was also examined in the temperature range 298 k to 823 K with maximum relative sensitivity (Sr) of 1.1% K−1 at 298 K for TCLs in Er-G and Er-GC samples.

Highlights

Temperature (T) is a fundamental parameter that must be measured precisely in many scientific and engineering fields [1,2,3]
Traditional temperature measuring devices, such as contact temperature sensors based on electrical changes in materials, have limitations in a variety of situations, such as nano- and micro-scale regimes, fast moving objects, corrosive environments, and inside cells, [4,5,6]
Among the various temperature measurement methods, which include the use of thermocouples, thermistors, and temperature resistance detectors (RTDs), the optical thermometry based on fluorescence intensity ratio (FIR) has received a lot of attention in the last decades because of its quick response, electromagnetic passivity, self-reference, and high sensitivity [4,7,8,9]

Summary

Introduction

Temperature (T) is a fundamental parameter that must be measured precisely in many scientific and engineering fields [1,2,3]. Among the various temperature measurement methods, which include the use of thermocouples, thermistors, and temperature resistance detectors (RTDs), the optical thermometry based on fluorescence intensity ratio (FIR) has received a lot of attention in the last decades because of its quick response, electromagnetic passivity, self-reference, and high sensitivity [4,7,8,9]. It reduces the impact of the experimental conditions, such as fluorescence loss and fluctuation of the pumping power [10,11]. Kusama et al [12]

Methods

Discussion

Conclusion