The nature of blue luminescence from natural benitoite BaTiSi3O9

Kitamura

Inoue

et al. 2005

Section: 22mentioning

confidence: 99%

Section: 22mentioning

confidence: 99%

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Effect of Heat-Treatment Temperature on Optical Properties of Ba2TiSi2O8 Nanocrystallized Glasses

Kitamura

Inoue

et al. 2005

“…9 In addition, it has an important industrial application for electron microprobes since it indicates an intense blue cathode-and photoluminescence. 10,11 Furthermore, it is considered as a candidate for a tunable solid-state laser crystal in the blue region.…”

Section: ࢪmentioning

confidence: 99%

Phase-Stability and Photoluminescence of BaTi(Si, Ge)3O9

Kitamura

Iyi

et al. 2006

313 Fig. 1. Crystal structure of benitoite; a A view of 001 and b 210 directions. Sphere, and dark and bright polyhedra correspond to Ba, and tetrahedral SiO 4 and octahedral TiO 6 units, respectively. The BaTiSi 3ࢬx Ge x O 9 crystalline phases were synthesized, and their phase-stability and photoluminescent PL properties were investigated. The benitoite and tetragermanate-type phases were crystallized in the range of xࢼ 0.75-1.5 and xࢼ2.0-3.0, respectively. It was suggested that Ge 4ࢪ occupies the octahedral Ti site due to the closeness of each ionic radii. The diffuse-reflection spectra revealed an increase in the oxygen-defect center by substitution of Ge in the crystalline phase. Although the BaTiSi 2.25 Ge 0.75 O 9 phase showed an efficient blue PL at room temperature, the PL intensity decreased drastically with the increasing x, and eventually the BaTiGe 3 O 9 phase indicated a very weak PL in spite of almost the same structure as benitoite, that is, the absolutely-isolated TiO 6 octahedral unit and the Ge 3 O 9 ring. It was suggested that the reduction of the PL intensity in the BaTiSi, Ge 3 O 9 phase was caused by the increase in the oxygen-defect center.

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“…2), 3) Recently, our research group has found and synthesized new titanosilicate phosphors showing the PL at room temperature, e.g., the suzukiite-type BaTiSi 2 O 7 indicating an orange emission, 4) and the fresnoite-type Ba 2 TiSi 2 O 8 -nanocrystallized glass indicating a bluish white emission. 5), 6) In this study, we focused on a zirconosilicate mineral, bazirite (BaZrSi 3 O 9 ), which was newly discovered from Scotland in 1970's, 7) and was an isostructural of benitoite, BaTiSi 3 O 9 .…”

Section: Introductionmentioning

confidence: 99%

Afterglow in synthetic bazirite, BaZrSi3O9

Masai

Fujiwara

et al. 2008