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Strategies for designing low thermal quenching upconverting temperature sensors
Manisha Prasad1, Vishab Kesarwani1, Vineet Kumar Rai1
1Laser and Spectroscopy Laboratory, Department of Physics, Indian Institute of Technology (Indian School of Mines) Dhanbad-826004 Jharkhand India vineetkrrai@yahoo.co.in vineetkrrai@iitism.ac.in +91-326-223-5404 extn 5282.
RSC Advances
|May 30, 2023
Summary
This study synthesized novel Er3+/Yb3+-doped NaGd(WO4)2 phosphors and phosphor-in-glass (PIG) materials. The PIG demonstrated improved thermal stability and resolution, making them promising for optical sensing applications.
Area of Science:
- Materials Science
- Optical Materials
- Luminescence
Background:
- Erbium (Er3+) and Ytterbium (Yb3+) co-doped NaGd(WO4)2 phosphors are investigated for their luminescent properties.
- Phosphor-in-glass (PIG) composites offer potential advantages over traditional phosphors.
Purpose of the Study:
- To synthesize and characterize Er3+/Yb3+:NaGd(WO4)2 phosphors and PIG materials.
- To evaluate the structural, morphological, and optical properties, focusing on luminescence and thermal behavior.
- To assess the suitability of PIG for temperature sensing applications.
Main Methods:
- Synthesis of NaGd(WO4)2 phosphors doped with Er3+/Yb3+.
- Fabrication of PIG samples by sintering phosphor and a TeO2-WO3-ZnO-TiO2 glass frit at 550 °C.
- Characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence spectroscopy.
- Analysis of upconversion (UC) emission spectra, luminescence sensitivity, and thermal quenching.
Main Results:
- Synthesized phosphors and PIG samples exhibited characteristic upconversion emission peaks under 980 nm excitation.
- PIG samples showed similar UC emission spectra to the parent phosphors.
- Maximum absolute sensitivity of 17.3 × 10-3 K-1 @ 473 K and relative sensitivity of 10.0 × 10-3 K-1 @ 296 K were observed.
- PIG demonstrated improved thermal resolution and reduced luminescence thermal quenching compared to the phosphor.
Conclusions:
- Er3+/Yb3+:NaGd(WO4)2 phosphors and their PIG composites were successfully synthesized.
- The PIG materials exhibit promising optical properties and enhanced thermal stability for luminescence applications.
- These PIG materials are suitable for temperature sensing due to improved thermal resolution and reduced thermal quenching.
