Development of novel fiber-optic temperature sensor using SrAl2O4:Eu2+, Dy3+ nanophosphor ceramics

This is one of the very few reports that describe the thermal stability of daylight excitable SrAl2O4:Eu2+,Dy3+ (SRA) nanophosphor for devising fiber-optic temperature sensor along with structural, morphological and detailed photoluminescence (PL) studies. The SRA nanophosphor was found to be stable in the atmosphere and thermal conditions up to 70 degrees C without any noticeable degradation. However, thermoluminescence glow curve exhibit a broad peak centered at similar to 75 degrees C after 5 min irradiation using D65 lamp. The trap-depth and frequency factor of SRA nanophosphors have been estimated using initial-rise method. The estimated trap depths were found to be in the range 0.26 eV and 0.38 eV, indicating the presence of shallow traps. The afterglow luminescence of SRA nanophosphor decreased with an increase in temperature up to 210 degrees C. A fiber-optic temperature sensor arrangement was conceived using the properties of temperature dependent afterglow intensity of SRA nanophosphor, where thermal excitation of trapped carriers played an effective role. With this, one can estimate that SRA nanophosphor is potentially useful for fiber-optic temperature sensor because of its highly sensitive sensor-head. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study investigates the thermal stability of daylight excitable SrAl2O4:Eu2+,Dy3+ (SRA) nanophosphor for fiber-optic temperature sensor applications. The SRA nanophosphor showed stability up to 70 degrees Celsius, but exhibited thermoluminescence glow curve centered at around 75 degrees Celsius.