Comparative study on blue-turquoise silicate apatite phosphors prepared via different synthesis routes
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Different types of gel precursors were obtained via microwave-assisted precipitation, gel-combustion, sol–gel, and Pechini methods in order to prepare Ca2Y7.76Ce0.12Tb0.12(SiO4)6O2 phosphors with apatite structure. The processes involved during the thermal treatment of precursors were revealed by TGA– FT-IR coupling. ICP-OES reveals that the incorporation degree of dopants (Ce3+, Tb3+) in silicate lattice are close to theoretical values while Ca2+ and Y3+ values shows differences depending on the synthesis route. The phosphors composition, morphology, structure, and optical characteristics are revealed by SEM, XRD, FTIR, and luminescent investigations. Pure hexagonal apatite with crystallite size of 76.5 nm was identified in sample prepared by gel-combustion, while cubic-Y2O3 and monoclinic-Y2SiO5, as secondary phases, were found in precipitated samples. The purity phase was enhanced by increasing the TEOS amount during precipitation. As a result of the Ce3+ incorporation into different symmetry sites, the excitation spectra are dominated either by 321 or 360 nm band. Turquoise emission of apatites is shifted toward blue region by increasing the excitation wavelength from 231 to 360 nm.
Ce–Tb-doped silicate apatite phosphors were prepared using four different synthesis routes.
The thermal decomposition of gel precursors was evaluated based on TG-FTIR.
Pure apatite with crystallites size of 76.5 nm was obtained using gel-combustion.
Structure and luminescence of apatites was improved using 50 mol% excess of TEOS in precipitation.
Excitation spectra are dominated by 321 or 360 nm band depending on phase purity.
KeywordsSilicate apatite Luminescence Wet chemical synthesis Phosphors
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. This study is part of the research that will lead to the elaboration of a doctoral thesis. Authors are grateful to the Babes Bolyai University for their financial support to undertake this work.
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Conflict of interest
The authors declare that they have no conflict of interest.
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