Luminescence and mechanoluminescence of Ba4Si6O16:Eu2+, RE phosphors

Alexis Duval; Yan Suffren; Mourad Benabdesselam; Patrick Houizot; Tanguy Rouxel

doi:10.1063/5.0167222

Luminescence and mechanoluminescence of Ba4Si6O16:Eu2+, RE phosphors

J Chem Phys. 2023 Oct 7;159(13):134501. doi: 10.1063/5.0167222.

Authors

Alexis Duval¹, Yan Suffren², Mourad Benabdesselam³, Patrick Houizot¹, Tanguy Rouxel^{1

4}

Affiliations

¹ Glass Mechanics Lab., IPR (Institut de Physique de Rennes), UMR 6251, University of Rennes, Campus de Beaulieu, Rennes, France.
² INSA Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, University of Rennes, Campus de Beaulieu, Rennes, France.
³ INPHYNI (Institut de Physique de Nice), UMR 7010, Côte d'Azur University, Nice, France.
⁴ Institut Universitaire de France, Paris, France.

PMID: 37782255
DOI: 10.1063/5.0167222

Abstract

The luminescence properties of green Ba4Si6O16:Eu2+, rare-earths (RE) (RE = Sc, Y, La and Lu except Pm) phosphors are reported. Their long-lasting phosphorescence is discussed in view of trap depths and concentrations determined from thermally stimulated luminescence experiments. A second emission band centered at 439 nm was evidenced at low temperatures, which stems from the substitution of Eu2+ in the two non-equivalent Ba2+ sites of Ba4Si6O16. The mechanoluminescence properties of Ba4Si6O16:Eu2+, RE phosphors are described, and a new mechanoluminescence mechanism is proposed, in the case where RE = Ho3+, involving a trap distribution from 0.694 to 0.924 eV. Mechanical loading (post UV irradiation) induces a decrease in depth of the trap distribution, leading to an increase of the luminescence intensity, whereas a drop of the luminescence intensity is observed upon unloading, following the faster release of the charge carriers.