Room temperature near infrared luminescence of an U~(3+) doped CsCdCl_3 potential laser crystal

摘要

Good quality U~(3+) doped CsCdCl_3 single crystals with a 0.05 mol% U~(3+) concentration have been obtained by the Bridgman-Stockbarger method. Luminescence spectra of the crystals were recorded at room temperature in the near infrared range. Excitation in the range of 5f~26d~1 bands at 514 nm produced a strong emission at 1.47 and 2.35μm from the ~4F_(3/2) and ~4I_(11/2) levels to the ~4I_(9/2) ground level, respectively and at 3.15 μm from the ~4F_(3/2) level to the first excited component of the ~4I_(11/2) level. For the first time very large lifetimes of the U~(3+) luminescence levels have been observed.