School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China.
Center of Advanced Analysis & Gene Sequencing, Zhengzhou University, Zhengzhou, China.
Luminescence. 2024 Jan;39(1):e4591. doi: 10.1002/bio.4591. Epub 2023 Sep 28.
Cerium has been widely used as a dopant in luminescent materials due to its unique electronic configurations. It is generally anticipated that the luminescence properties of rare-earth-doped materials are closely related to the local environment of activators, especially for Ce . In addition, it is convenient to modulate its emission wavelength by adjusting the composition and structure. In this study, we systematically analyzed the microstructure of the Ce-doped CaYAlO system at atomic resolution. The quantitive results indicated that the structure distortion greatly influenced the valence state of the Ce dopant, which is critical to its luminescence efficiency. In addition, valence variations also exist from surface to inner structure due to the big distortion area around the surface. Our results unravel the interplay of local structure and valence transitions in Ce-doped aluminate phosphors, which has the potential to be applied in other luminescent materials.
铈因其独特的电子结构而被广泛用作发光材料的掺杂剂。一般来说，稀土掺杂材料的发光性能与其激活剂的局部环境密切相关，尤其是铈。此外，通过调整组成和结构可以方便地调节其发射波长。在这项研究中，我们在原子分辨率下系统地分析了掺铈的 CaYAlO 体系的微观结构。定量结果表明，结构变形极大地影响了 Ce 掺杂剂的价态，这对其发光效率至关重要。此外，由于表面附近的大变形区域，价态变化也存在于从表面到内部结构的过程中。我们的结果揭示了掺铝酸盐荧光粉中局部结构和价态转变的相互作用，这有可能应用于其他发光材料。
