Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 16, Pages 26382-26387Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.03.201
Keywords
Powders: chemical preparation; Spectroscopy; Chemical properties; Optical properties; Tunable up-conversion luminescence
Categories
Funding
- National Center for Research and Development (Poland) [LIDER/39/0141/L-9/17/NCBR/2018]
- National Science Center of Poland [UMO-2016/21/B/ST5/00110, POWR.03.02.00-00I020/17]
- European Union through the European Social Fund under the Operational Program Knowledge Education Development
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NaYbF4 luminophores doped with Ho3+ and increasing amount of Ce3+ were synthesized by the solvothermal method in a DAB-2 reactor. The structure and morphology of the obtained materials were determined by X-ray diffraction and a scanning electron microscope. It was confirmed that the phase structure and morphology can be changed by modifying the concentration of Ce3+ ions and synthesis conditions. Analysis of the elemental composition of each sample, based on energy-dispersive X-ray spectroscopy measurements, showed that the desired concentration of the Ce3+ ions is different than expected. Moreover, spectroscopic properties were carefully examined. Up-conversion emission spectra were measured under 975 nm excitation and two characteristic bands of Ho3+ were assigned to the transitions: S-5(2), F-5(4)-> I-5(8) and F-5(5)-> I-5(8) . These bands had the strongest influence on the emission colour of the luminophores. Furthermore, an additional transition band I-5(6)-> I-5(8) appeared in the near-infrared range. Noteworthy, the increase in Ce3+ concentration from 0 to 3.6% allowed for tuning the emission colour from green to orange. Interestingly, the emission above these values is again greener. Finally, the up-conversion mechanism was shown and verified.
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