Simultaneous MulticolorEmission of Down-Shiftingand Up-Conversion in Er<sup>3+</sup>, Yb<sup>3+</sup>-Codoped Cs<sub>2</sub>NaScCl<sub>6</sub> Double Perovskites
Lanthanide ion-doped metal halides are a promising class of fluorescent materials. In this paper, we investigated the optical properties and photophysical mechanism of Er<sup>3+</sup>, Yb<sup>3+</sup>-doped Cs<sub>2</sub>NaScCl<sub>6</sub> phosphor. It was demonstrated that in both up-conversion (UC) and down-shifting emission modes, the increase of Yb<sup>3+</sup> concentration resulted in enhancement of the <sup>4</sup>F<sub>9/2</sub> → <sup>4</sup>I<sub>15/2</sub> emission of Er<sup>3+</sup> in Cs<sub>2</sub>NaScCl<sub>6</sub>. In particular, UC emission gradually shifts from green to yellow with the enhancement of the excitation power density observed in Yb<sup>3+</sup>-rich systems. The complex cross-relaxation behavior between Yb<sup>3+</sup> and Er<sup>3+</sup> results in these phenomena. New paradigms are provided for the development of multimodal and dynamic fluorescent anticounterfeiting materials.
Publication Details
- Journal
- Figshare
- Published
- 2025-03-10
- DOI
- https://doi.org/10.1021/acs.jpcc.5c00961.s001
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00