What are the Electronic configuration and Spectral characteristics of luminescent elements in thin crystals?

Rare earth ions are the most widely used activator ions in luminescent materials. The reason why rare earth elements exhibit excellent luminescence is closely related to their typical electronic configuration. It is this special electron layer structure that enables rare earth elements to release the absorbed energy in the form of photons.

1. Electronic configuration of rare earth elements

There are 17 species of rare elements, which are composed of se (scandium), Y (yttrium) and lanthanide (atomic number 57-71) of group B. The outermost electronic structures of se and Y are similar, so the outer electricity of S, Y and caloric system elements are similar, so the two elements of group B are classified as rare earth elements.

From the electron layer structure analysis of rare earth elements, the two orbits and one f orbital of rare earth elements can easily become three orbits with equal energy after hybridization. Stable compounds with lower energy state can be obtained by interaction between the hybrid electron orbital and the valence electrons belonging to anion. When the position of the valence band changes, a lot of fluorescence will occur when the energy band drops from the band above 5s and 5p to the band f.

2. Spectroscopic characteristics of rare earth ions

The electron layer structure of rare earth ion is characterized by its non-filled 4f layer, and the 4f layer orbit is inside the rare earth ion. This 4f electron in the inner layer of the thin ion has different energy levels, and its migration at different energy levels will bring a lot of information about the absorption and emission spectra, which describe the properties of the synthesized compounds. For example, its composition, structure, element valence state, etc. However, because the 4f electron orbital is obscured by the external orbits, the matrix lattice has a small effect on the absorption and emission of the 4r electron configuration light. The energy level migration of rare earth ions to produce light is closely related to the spectral properties of rare earth ions.

This article is from Allicdata Electronics