Luminescence and structural properties of ytterbium and erbium co-doped LaGaO3 nanophosphor for up-conversion by polyol method
| Autor: | Rajak Syed, Vasanthakumaran Sudarsan, Vivekanand Kain, Sandeep K. Agarwalla, Anitha Mallavarapu, D.K. Singh |
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| Rok vydání: | 2021 |
| Předmět: |
Ytterbium
Materials science chemistry.chemical_element 02 engineering and technology General Chemistry Gallate 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Erbium chemistry Physical chemistry General Materials Science Orthorhombic crystal system Crystallite Fourier transform infrared spectroscopy 0210 nano-technology Luminescence Thermal analysis |
| Zdroj: | Solid State Sciences. 117:106626 |
| ISSN: | 1293-2558 |
| DOI: | 10.1016/j.solidstatesciences.2021.106626 |
| Popis: | Ytterbium and erbium co-doped lanthanum gallate (LaGaO3) up-conversion phosphors have been synthesized using polyol method followed by heating at 1000°C. From Fourier transform infrared (FTIR) spectroscopy and thermal analysis studies of as prepared sample, formation of hydroxy carbonate precursor has been confirmed. This precursor undergoes two step decomposition leading to the formation of LaGaO3 phase. Detailed X-ray diffraction studies confirmed the formation of orthorhombic LaGaO3 phase with distorted GaO6 octahedra and distorted LaO12 cuboctahedra. As the annealing temperature increased from 1000°C to 1200°C, green to red ratio (GRR) as well as lifetime values increased and this is explained based on the increase in crystallite size from 40 nm to 95 nm and associated decrease in the extent of quenching (non-radiative) processes. Variation in the “n” values accounts for the observed increase in the GRR values corresponding to 1000°C and 1200°C annealed samples with increase in laser power. |
| Databáze: | OpenAIRE |
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