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With the simple reactants of RE(NO3)3, Na2CO3 and (NH4)2SO4 for hydrothermal reaction, dispersed monospheres and nanoplates were selectively synthesized for the recently discovered RE2(OH)2CO3SO4.nH2O (RE = Gd0.95Eu0.05, REOCSH) layered compound precursor, from which RE2O2SO4 phosphors mostly retaining their precursor morphologies were facilely derived via calcination in air at 800 oC, without involving SOx. Solution pH was found to decisively determine the chemical composition and crystallization kinetics of the initial precipitate, and the possible mechanisms of phase/morphology evolution during hydrothermal treatment were proposed by comparatively investigating the temperature-course and time-course of REOCSH formation under the typical pH values of 6 and 7. It was revealed that (Gd0.95Eu0.05)2O2SO4 monospheres emit 1.35 times as strong as nanoplates and may retain as high as 81% of the room-temperature intensity at 150 oC. The phosphor monospheres were also analyzed to have a fluorescence lifetime of 1.32 ms at room temperature and an activation energy of 0.19 eV for the thermal quenching of luminescence.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: RE2O2SO4, Luminescence, Hydrothermal reaction, Phase/morphology evolution

Date published: 2023-09-15

Publisher: Elsevier BV

Journal:

• ADVANCED POWDER TECHNOLOGY (ISSN: 09218831) vol. 34 issue. 11 p. 104224-104224

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4333

First published URL: https://doi.org/10.1016/j.apt.2023.104224

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Updated at: 2025-09-14 08:30:18 +0900

Published on MDR: 2025-09-14 08:17:27 +0900