Ternary sulfides ALnS₂:Eu²⁺ (A = alkaline metal, Ln = rare-earth element) for lighting: Correlation between the host structure and Eu²⁺ emission maxima

Ternary sulfides ALnS₂:Eu²⁺ are characterized by a very wide range of tunability of the Eu²⁺ emission maxima with the host’s chemical composition. The position of the Eu²⁺ emission maxima is a linear function of the so-called hexagonality (ratio c/a, where c and a are the lattice constants). The obtained results can be used as helpful guides for manufacturing Eu²⁺-doped ternary sulfides with desired emission properties with high potential for white LEDs applications.

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Experimental and predicted Eu²⁺ emission maxima in the ALnS₂ sulfides. Figure from DOI 10.1016/j.cej.2021.129380.