Issue 19, 2024

A brief review of characteristic luminescence properties of Eu3+ in mixed-anion compounds

Abstract

Trivalent europium (Eu3+) ions show red luminescence with sharp spectral lines owing to the intraconfigurational 4f–4f transitions. Because of their characteristic luminescence properties, various Eu3+-doped inorganic compounds have been developed to meet the demands of optoelectronic devices. Regardless of shielding by the outer 5s and 5p orbitals, the properties of the Eu3+:4f–4f transition depend on the local environment, such as the shapes of the coordination polyhedra, site symmetry, nephelauxetic effects, crystal field effects, and bonding character. Mixed-anion coordination, where multiple types of anions surround a single Eu3+ ion, can directly affect the optical properties of Eu3+. We review the luminescence properties of Eu3+ ions in mixed-anion compounds of the oxynitride YSiO2N and oxyhalides YOX (X = Cl or Br). Oxynitride and oxyhalide coordination results in characteristic transition probabilities and branching ratios of the 5D07F0–6 transitions due to distorted structural environments and red-shifted charge transfer excitation bands due to an upward shift of the valence band. The expected and experimentally observed features of Eu3+ luminescence in mixed-anion compounds are outlined based on band and Judd–Ofelt theories. Future applications of the intense red luminescence at ∼620 nm under near-ultraviolet light illumination in Eu3+-doped mixed-anion compounds are introduced, and material design guidelines for new functional Eu3+-doped phosphors are presented.

Graphical abstract: A brief review of characteristic luminescence properties of Eu3+ in mixed-anion compounds

Article information

Article type
Perspective
Submitted
21 janv. 2024
Accepted
15 avr. 2024
First published
16 avr. 2024

Dalton Trans., 2024,53, 8069-8092

A brief review of characteristic luminescence properties of Eu3+ in mixed-anion compounds

Y. Kitagawa, J. Ueda and S. Tanabe, Dalton Trans., 2024, 53, 8069 DOI: 10.1039/D4DT00191E

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