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Systematic synthesis of (Gd1-xLax)2O2SO4:Tb3+ and (Gd1-xLax)2O2S:Tb3+ nanophosphors for remarkably enhanced luminescence
Coprecipitation with rare-earth nitrate, ammonium sulfate and ammonium hydroxide produced hydroxide-type amorphous precursors incorporating sulfate and carbonate anions, from which [(Gd1-xLax)0.99Tb0.01]2O2SO4 and [(Gd1-xLax)0.99Tb0.01]2O2S were obtained as two series of nanophosphors by calcination at 950°C in air and hydrogen, respectively. The detailed characterization by XRD, SEM/TEM, BET and particle sizing confirmed that solid solutions were directly formed and that the products have small crystallite size, unimodal size distribution and high specific surface area, revealing the advantages of the synthesis method. Photoluminescence study revealed that La3+ admixture may significantly improve the 545 nm main emission of Tb3+ for both the phosphor series. Furthermore, the 545 nm main emission of [(Gd1-xLax)0.99Tb0.01]2O2SO4 was identified to have an excellent thermal stability, which retained over 90% of its room temperature intensity at 150°C (no quenching for Gd2O2SO4:Tb3+). The two series of phosphors were comparatively studied for their excitation and luminescence performances, as a function of temperature and La3+ content, and the results were rationalized by considering bandgap, crystal structure, UV absorption, and the character of chemical bonds.
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- 11/08/2023
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- This is the peer reviewed version of the following article: Systematic synthesis of (Gd1-xLax)2O2SO4:Tb3+ and (Gd1-xLax)2O2S:Tb3+ nanophosphors for remarkably enhanced luminescence, which has been published in final form at https://doi.org/10.1111/jace.19384. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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