Work

Optical Evidence of Charge Trapping at Lanthanide Codopants in SrAl 2 O 4 :Eu,Ln (Ln = Nd, Sm, Dy) Persistent Phosphors

Year: 2024

Type: article

Abstract: In this work, the absorption spectra of metastable Dy 2+ , Nd 2+ , and Sm 2+ are identified in SrAl 2 O 4 :Eu,Ln persistent phosphors after excitation with blue light, thereby confirming that the persistent luminescence is indeed due to a charge transfer between the two lanthanide dopants. In contrast to previous studies relying on X‐ray absorption spectroscopy to observe charge transfers between dopants, here low‐energy light is exclusively employed to probe for changes in the absorption spectrum of the phosphor, thereby only minimally affecting the state of the phosphor. Optical bleaching in combination with thermoluminescence measurements allowed to assign which optically active trapping centers contribute to the afterglow of the persistent phosphors.

Source: Advanced Optical Materials

DOI: 10.1002/adom.202402153

Authors: David Van der Heggen, Jonas J. Joos, Philippe F. Smet

Institution: Ghent University

Language: English

Topic: Luminescence Properties of Advanced Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Fonds Wetenschappelijk Onderzoek, Universiteit Gent, Vlaamse regering, Bijzonder Onderzoeksfonds UGent

Awards: NanoQuaLum: Unlocking the Potential of Radioluminescent Nanoparticles: Topographic Dosimetry for Improved Quality Assurance Procedures in Clinical Contexts, G4416505526, Follow the charge : using advanced optical and X-ray spectroscopy to master charge transfer processes in phosphors, G7633615686