Roles of fluorine and annealing on optical and structural properties of Nd:YF3 phosphor
| Autor: | Carlos Jacinto, Harrisson D. A. Santos, S.M.V. Novais |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Annealing (metallurgy) Biophysics Nucleation Analytical chemistry Mineralogy chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences chemistry X-ray crystallography Fluorine Orthorhombic crystal system Fourier transform infrared spectroscopy 0210 nano-technology Stoichiometry |
| Zdroj: | Journal of Luminescence. 175:237-242 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.03.008 |
| Popis: | The optical and structural properties of Nd:YF 3 phosphors, synthesized by precipitation reaction using ethylene glycol solvent, were investigated. The Y:F molar ratio of precursors, where NH 4 F was employed as the fluorine source, was varied to prevent oxygen contamination during nucleation of the particles and to improve the photoluminescence efficiency. Structural investigations were carried out by means of X-ray diffraction, Fourier transform infrared spectroscopy and energy dispersive X-ray techniques. Samples prepared using precursors in stoichiometric proportion presented orthorhombic YF 3 structure. The use of fluorine source in excess promoted formation of NH 4 Y 2 F 7 crystalline phase, which was decomposed into YF 3 after annealing at 400 °C for 1 h. Emission spectra of samples thermally treated enhanced by over 50 times compared with the as prepared. The results obtained show the role of fluorine excess associated with thermal annealing to obtain YF 3 with improved features. |
| Databáze: | OpenAIRE |
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