Afterglow in synthetic bazirite, BaZrSi3O9

Abstract

A blue afterglow was observed in the bazirite-type BaZrSi 3 O 9 synthesized by a solid-state reaction for the first time. The synthetic bazirite phase showed a clear blue long-lasting luminescence at room temperature after the exposure of UV light, in spite of the free from any lanthanide-doping. It was proposed that the afterglow in the BaZrSi 3 O 9 phase was originated from the occupation of Ti 4＋ as an impurity in the distorted octahedral site.

Synthesis and luminescence of novel near‐infrared emitting BaZrSi3O9:Cr3+ phosphors

“…It has been known that, when doped into a matrix, Cr 3+ ions preferentially occupy an octahedral site to reduce the internal energy of the system and, consequently, the system would become more stable; its characteristic emission strongly depends on its coordinates and ligand field. As shown in Figure , crystal structure of BZS consists of [Si 3 O 9 ] 6− rings with a trigonally distorted BaO 6 and ZrO 6 octahedron . Three SiO 4 tetrahedrons connect to make a [Si 3 O 9 ] 6− ring.…”

“…Several efficient phosphors using the BaZrSi 3 O 9 (BZS) matrix have been reported recently such as BZS:Eu 2+ , BZS:R 3+ (R = Eu, Sm, Dy, Tb and Pr), BZS:Bi 3+ , BZS:Ce 3+ and BZS:Ce 3+ ,Tb 3+ . The BZS type silicate possesses a rigid crystal structure, which consists of a corner‐shaped trisilicate (Si 3 O 9 ) group ring and share an edge with trigonally distorted the BaO 6 and ZrO 6 octahedron . As this kind of silicates is stable and possesses the open framework, they can accommodate different metal ions with high content in the same crystal structure .…”

“…[23] The BZS type silicate possesses a rigid crystal structure, which consists of a corner-shaped trisilicate (Si 3 O 9 ) group ring and share an edge with trigonally distorted the BaO 6 and ZrO 6 octahedron. [24] As this kind of silicates is stable and possesses the open framework, they can accommodate different metal ions with high content in the same crystal structure. [25] In our research, BZS:Cr 3+ phosphor was prepared using a high temperature solid-state reaction.…”

Origin of photoluminescence in suzukiite-type BaTiSi2O7

“…3)- 7) According to the extensive research of the PL property in compounds with Ti 4+ so far, two types of PL mechanisms exist. One is caused by an ultraviolet (UV) excitation, corresponding to the charge-transfer (CT) transition from the 2p orbitals of the surrounding oxygen ion to the empty outer 3d orbital of Ti 4+ (O 2--Ti…”

Raman spectroscopic study of benitoite-type compounds

“…4) Therefore, the D2/vG(Si3O9)-type compounds have a great potential for blue emitting and long-lasting phosphors without lanthanide elements. On the other hand, second-order optical nonlinearity of LiNbO3-class has been accomplished in transparent fresnoite-type Ba2TiGe2O8-crystallized glasses, 5) and the BaTiGe3O9/BaGe4O9 phase plays an important role for formation of the Ba2TiGe2O8 phase in the BaO-TiO2-GeO2 system glasses.…”