Abstract
This work focused on influences of Sc3+ dopants on local site symmetry and ligand field of Er3+ activators as well as its up-conversion luminescence performances sensitized by Yb3+ ions in NYTiO4 (NYT). The structure analysis and Judd-Ofelt calculation confirmed that doping Sc3+ ions could lower site symmetry as well changed the ligand field around Er3+ ions. The introduction of Sc3+ ions induced variations of crystal lattices, regulated distances between Er3+ions and Er3+ or Yb3+ ions, and thus influenced the up-conversion luminescence properties. Besides, time-resolved decay curves figured out the great enhancement of lifetime and luminescence quantum efficiency for both green and red emissions due to Sc3+ dopants. For optical temperature sensitivity, thermally coupled levels (TCLs) for blue emission 4F5/2/4F7/2→4I15/2 was studied for the first time. Besides, TCLs for violet emission 4G11/2/2H9/2→4I15/2 as well as green emission 2H11/2/4S3/2→4I15/2 were also recorded. By tri-doping Sc3+ ions into NYT: Yb/Er, both absolute sensitivity and relative sensitivity of above three TCLs were improved with temperature uncertainty decreasing.
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