EPR and optical investigation of ultraviolet-emitting Gd3Ga5O12 garnet
| Autor: | D.A. Hakeem, M.S. Pathak, Vijay Singh, J.L. Rao, N. Singh, Manoj Mohapatra, G. Sivaramaiah |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Absorption spectroscopy Octahedral symmetry Analytical chemistry Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease_cause 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Ion law.invention law medicine Emission spectrum Electrical and Electronic Engineering 0210 nano-technology Electron paramagnetic resonance Excitation Ultraviolet |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 29:944-951 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-017-7992-1 |
| Popis: | Gd3Ga5O12 garnet was prepared by a solution combustion method and characterized using powder X-ray diffraction, electron paramagnetic resonance (EPR) and optical spectroscopic techniques. EPR spectrum of the samples at ambient and low temperatures exhibited resonance signal at g ≈ 2 attributed to Gd3+ ions disposed in an octahedral symmetry. The optical absorption spectrum showed a band centered at 274 nm attributed to 8S7/2→6IJ transition of the Gd3+ ions. The excitation spectrum showed a maximum at 273 nm along with two relatively weaker peaks at 276 and 279 nm. These three excitation bands were assigned to the transitions 8S7/2→6IJ. The emission spectrum showed two peaks centered at 311 and 306 nm that were assigned to the transitions 6P7/2→8S7/2 and 6P5/2→8S7/2 of Gd3+, respectively. To evaluate the phosphor performance, several magnetic and thermodynamic parameters for the system were calculated adopting standard procedure. |
| Databáze: | OpenAIRE |
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