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Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
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Impact of Structural Changes on Energy Transfer in the Anion-Engineered Re3+:Y2O3 Through Low-Temperature Synthesis
Maharram Jabrayilov1, Kelly E Cohen1, Cameron L Roman1
1Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|February 21, 2024
Summary
Anion engineering of yttrium oxide hosts (Y2O2SO4, Y2O2S) was achieved through a low-temperature synthesis. This method tailored optical properties by controlling crystal structure and dopant hybridization, enhancing luminescence.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Luminescence
Background:
- Anion engineering is a key strategy for tuning metal oxide properties.
- Rare earth (RE)-doped materials are crucial for optical applications.
- Controlling crystal structure influences material performance.
Purpose of the Study:
- To develop a low-temperature synthesis for RE-doped Y2O2SO4 and Y2O2S.
- To investigate the correlation between structural transformations and optical properties.
- To optimize luminescence through anion modification and energy transfer.
Main Methods:
- Low-temperature annealing of Y(OH)3 intermediates with elemental sulfur.
- Controlled reduction steps.
- X-ray diffraction (XRD) and UV-IR optical spectroscopy for structural and optical analysis.
- Thermogravimetric analysis (TGA) for structural transformation monitoring.
- Doping with Eu3+, Ce3+, and Tb3+ to study optical behavior and energy transfer.
Main Results:
- Successful low-temperature synthesis of Y2O2SO4 and Y2O2S.
- Observed systematic shifts in Eu3+ excitation/emission peaks due to crystal structure evolution (cubic Y2O3 to trigonal Y2O2S to monoclinic Y2O2SO4).
- Demonstrated modification of dopant (Ce3+) local hybridization by anion composition.
- Significant enhancement in Tb3+ and Tb3+/Ce3+ luminescence via energy transfer in the monoclinic Y2O2SO4 host.
Conclusions:
- Low-temperature anion engineering effectively tailors the crystal structure and optical properties of yttrium oxide-based materials.
- The monoclinic Y2O2SO4 host exhibits superior luminescence performance due to optimized energy transfer pathways.
- This work provides a pathway for designing advanced luminescent materials through precise control of crystal chemistry.
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