Facile Reversible Eu2+/Eu3+ Redox in Y2SiO5 via Spark Plasma Sintering: Dwell Time-Dependent Luminescence Tuning

The present study investigates the luminescent behaviour of sol–gel derived Y2SiO5 powders doped with Eu3+ ions, subjected to spark plasma sintering. The sintering process induces the partial reduction of Eu3+ to Eu2+, and the phenomenon is strongly dependent on the holding time within the SPS chamber. The luminescent properties are tunable via the initial Eu concentration, holding time and excitation wavelength, resulting in a wide range of emission colours from red (Eu3+) at 220 nm excitation to blue (Eu2+) at 365 nm, and mixed colours at 257 nm. Moreover, the Eu3+/Eu2+ redox process is reversible. Overall, the results demonstrate that SPS conditions can be exploited to modulate the valence state of luminescent centres, which is reversible by oxidation under ambient conditions, enabling controlled modulation of the optical properties.

• Publication year

  2025

• Venue

  Inorganics

• Publication date

  2025-09-30

• Fields of study

  Not labeled

• Identifiers
  DOI 10.3390/inorganics13100325
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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