Abstract Yb3+ ions initiated upconversion properties of Ruddlesden-Popper type layered materials were studied to elucidate the tunability of the visible emission under 980 nm excitation. The substitution of lanthanum ions in the host layer perovskites with different concentrations of Yb3+/Er3+ and Yb3+/Tm3+ as the sensitizer/activator pairs was performed via the solid-state procedure. The upconversion spectra of the samples have depicted that the materials relatively lower dopant concentrations of Yb3+/Er3+ have the green color, which was shifted to the red region due to both heavy activator and sensitizer concentrations because of the dominant 4F9/2 → 4I15/2 transition rather than the 2H11/2, 4S3/2 → 4I15/2 transitions. The tunability of upconversion emission of Yb3+/Tm3+ introduced materials was limited in the visible region compared to the Yb3+/Er3+ pair despite the fact that the wide variety of the lanthanide concentrations were studied and the layered materials were structured successfully. On the other hand, the first intense NIR emission was achieved for the layered perovskites co-doped with Yb3+/Tm3+ due to the 3H4→ 3H6 relaxation.

中文翻译：

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基于浓度的镧系元素共掺杂 Ruddlesden-Popper 型层状钙钛矿的多色上转换发射

摘要 研究了Ruddlesden-Popper 型层状材料的Yb3+ 离子引发的上转换特性，以阐明在980 nm 激发下可见光发射的可调性。用不同浓度的 Yb3+/Er3+ 和 Yb3+/Tm3+ 作为敏化剂/活化剂对，通过固态程序替代宿主层钙钛矿中的镧离子。样品的上转换光谱表明，掺杂浓度相对较低的 Yb3+/Er3+ 材料呈绿色，由于 4F9/2 → 4I15/2 占主导地位，因此由于重活化剂和敏化剂浓度而移至红色区域转换而不是 2H11/2、4S3/2 → 4I15/2 转换。与 Yb3+/Er3+ 对相比，Yb3+/Tm3+ 引入材料的上转换发射的可调性在可见光区域受到限制，尽管研究了多种镧系元素浓度并且层状材料已成功构建。另一方面，由于 3H4→3H6 弛豫，与 Yb3+/Tm3+ 共掺杂的层状钙钛矿实现了第一次强烈的 NIR 发射。