Optimizing the Nd:YF3 phosphor by impurities control in the synthesis procedure
| Autor: | Carlos Jacinto, S.M.V. Novais, Harrisson D. A. Santos |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Annealing (metallurgy) Biophysics Analytical chemistry chemistry.chemical_element Phosphor 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 Crystallinity chemistry Impurity Fluorine 0210 nano-technology Luminescence Excitation Stoichiometry |
| Zdroj: | Journal of Luminescence. 201:156-162 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2018.04.051 |
| Popis: | Oxygen impurities played a pivotal role by affecting the optical and structural properties of Nd:YF3 phosphor, mainly when annealing procedure at high temperature is applied on it. In this work, it was demonstrated that luminescence decay, excitation and emission spectra of Nd:YF3 phosphor were greatly influenced by quenching sites and crystal bulk and surface defects induced by the presence of oxygen impurities incorporated into its structure. The excitation spectra presented a broad band from 200 to 550 nm, related to oxygen impurities, showing an alternative pathway to identify its presence. To overcome this recurrent problem, fluorine excess was used to reduce the oxygen contamination, allowing improvement of both crystallinity and luminescence efficiency of the Nd:YF3 phosphor. Despite this outstanding result, it was found that the fluorine content cannot be applied indiscriminately above of the stoichiometric proportion and its optimum quantity in excess was found to be at around 20%. |
| Databáze: | OpenAIRE |
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