title: Blue photoluminescence, greenish-blue afterglow and their Ti-concentration dependence in rare earth-free bazirite-type BaZr1-xTixSi3O9.
abstract: We synthesized Ti-bearing bazirite (BaZr(1-x)Ti(x)Si(3)O(9), x=0-0.2) and examined their spectroscopic features comprehensively, in order to elucidate the photoluminescent properties in the bazirite phase. Strong emission around 2.79 eV was observed in the synthetic bazirite phase with x=0.01 by UV excitation, which exhibited an internal quantum yield of 72% at room temperature. In addition, the bazirite phases also showed clear afterglow with peak around 2.62 eV in the range of x=0.005-0.03, whereas no afterglow property was confirmed in Ti-bearing pabstite (BaSnSi(3)O(9)) phases, in spite of being isostructural of bazirite. It was demonstrated that presence of Zr-related center is a necessary condition for evolution of the afterglow property in the bazirite structure.
authors.affiliation: Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Iwasaki
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Masai
authors.forename: Takumi
authors.initials: T
authors.lastname: Fujiwara
mesh_terms: D003116:Color; D049408:Luminescent Agents / Q000737:chemistry*; D008422:Materials Testing; D008674:Metals, Rare Earth / Q000737:chemistry* / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D049408:Luminescent Agents; D008674:Metals, Rare Earth; D014025:Titanium