기초과학융합연구소

•연구자: 물리학과 이윤상

•발표일: 2023.08

•DOI: https://doi.org/10.1016/j.optmat.2023.114094

•D. J. Lee and Y. S. Lee, Optical materials (Q2);  Volume 142, 114094. (2023)

•Abstract

We investigated the co-doping effect of Ce³⁺ and Eu³⁺ ions on the visible emission of the single-layered perovskite Sr₂SnO₄. The Ce³⁺ single-doped Sr₂SnO₄ showed a sizable feature at approximately 260 nm in the photoluminescence excitation spectra and a broad peak at approximately 400 nm in the photoluminescence spectra. These peaks were attributed to the 4f–5d transitions of Ce³⁺. In the Ce³⁺ and Eu³⁺ co-doped samples, as the concentration of Ce³⁺ increased, the emission intensity of Eu³⁺ increased drastically with near-ultraviolet excitation due to the energy transfer from Ce³⁺ to Eu³⁺. Because of the changes in the relative emission intensities of the two ions, the colors emitted by phosphor were tuned from blue/orange to red. We also discussed the effect of Ce³⁺ doping on the photochromic behavior of Eu³⁺-doped Sr₂SnO₄, together with luminescence modulation.