Abstracts

Inorganic perovskites are a huge family of materials characterized by a unique crystal structure. The first literature reports about these materials appeared in the 19th century. The composition of the perovskite determines to which group a given compound can be classified. Among them, we can distinguish layered, three-dimensional, or double perovskites. Each of the mentioned groups may contain only inorganic ions or organic ligands substituted in the position of the cation A and/or the anion X, creating the so-called hybrid perovskites. Inorganic oxide perovskites with an ABO₃ structure attract great attention in the scientific community from the point of view of basic and implementation research. The structure of three-dimensional (ABO₃) perovskites is quite flexible, which allows the A and B positions to be replaced with other ions of different sizes. As a consequence, bonds of different lengths are formed, leading to structural deformations. Therefore, the obtained materials can crystallize in various crystallographic systems, while their structural stability is maintained thanks to oxygen vacancies, which additionally determine their physicochemical properties. Here we present the optical properties of LaAlO₃ perovskite doped with different concentrations of neodymium(III) under excitation with a focused infrared beam. The result was a broadband white emission covering the entire visible range with characteristic dips closely related to the presence of Nd³⁺ ions. It is interesting to note that the dopant concentration has a strong influence on the shape of the recorded emission bands, Surprisingly, the full substitution of Al³⁺ ions with Nd³⁺ ions does not cause concentration quenching for the luminescence generated in this way.