Zolotovsky A. Energy spectrum of rare earth ions (Tm3+, Tb3+, Sm3+) in sulphide and oxide matrices in cluster approximation

The object is sulphide and oxide matrixes. The aim is to determine the regularity of energy spectrum formation of rare earth ions (Tm3+, Tb3+, Sm3+) in sulphide and oxide matrices, which are widely used in optoelectronics. The methods are the high resolution spectroscopy in the optical range, group theory, crystalline field theory, ligand theory. Results: The strong dependence of the intensity of energy spectrum of rare earth ions (Tm3+, Tb3+, Sm3+) in sulphide and oxide matrixes from the structure of the complex "rare ion - the nearest neighborhood" is detected. The model of rare earth ion, surrounded by the ions of O, S in cluster approximation is constructed. The task of many particles in solids for this model is firstly quantitatively solved. The nature of common increase of the stripe's intensities and relative increase of their intensities in the short-wave part of spectrum with the increase of the rare earth ion electron covering and the substitute element electron covering bridging during the change of chalcogenide (O, S) in the nearest neighborhood by the halogens (F, Cl, Br) is determined. Field of application: solid state physics, optoelectronics