Figure 3
From: Photoluminescence associated with the site occupations of Ho3+ ions in BaTiO3
(a) XRD pattern, (b) EPR spectrum for the nominal (Ba1−x Ho x )Ti1−x/4O3 (x = 0.01) ceramic (BH1T) sintered at T s = 1300 °C. The real formula of BH1T is approximately expressed by (Ba1−x Ho x−δ )(Ti1−x/4Ho δ )O3 (δ is a small quantity) with a small number of Ti-site Ho3+ ions. (c) The comparison in photoluminescence spectra between BHTH and BH1T clearly reveals that Ti-site Ho3+ ions are responsible for 5G6/5F1 → 5I7 transition of Ho3+.
