Roles of fluorine and annealing on optical and structural properties of Nd:YF3 phosphor

The optical and structural properties of Nd:YF3 phosphors, synthesized by precipitation reaction using ethylene glycol solvent, were investigated. The Y:F molar ratio of precursors, where NH4F was employed as the fluorine source, was varied to prevent oxygen contamination during nucleation of the pa...

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Bibliographic Details
Published inJournal of luminescence Vol. 175; pp. 237 - 242
Main Authors Santos, H.D.A., Novais, S.M.V., Jacinto, C.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2016
Subjects
Fluoride
Luminescence
Phosphors
Precipitation
Rare-earth
Rare-earth
Precipitation
Fluoride
Phosphors
Luminescence
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Summary:The optical and structural properties of Nd:YF3 phosphors, synthesized by precipitation reaction using ethylene glycol solvent, were investigated. The Y:F molar ratio of precursors, where NH4F 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 YF3 structure. The use of fluorine source in excess promoted formation of NH4Y2F7 crystalline phase, which was decomposed into YF3 after annealing at 400°C for 1h. 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 YF3 with improved features.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2016.03.008