Irregular Ce~(3+) and defect-related luminescence in YAlO_3 single crystal

摘要

Using the methods of time-resolved and steady-state luminescence spectroscopies, the luminescence and defects creation processes were studied at 4.2-300 K under excitation in the 3.0-10.5 eV energy range for an YAlO_3:Ce crystal with very low concentration of Ce~(3+) ions. The results were compared with those obtained at the study of YAlO_3:Ce crystals with large Ce~(3+) content coming from the same technological laboratory. Three irregular Ce~(3+) centers were found and two intrinsic defect luminescence centers related to the cation and oxygen vacancies were evidenced. The origin and structure of luminescence centers are discussed.