Structural consideration on the emission properties of Eu{sup 2+}-doped Li{sub 2}BaMgP{sub 2}O{sub 8} and Na{sub 2}BaMgP{sub 2}O{sub 8} orthophosphates

Journal Article · Sat Dec 15 04:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.07.001· OSTI ID:22149962

Yonesaki, Yoshinori ^[1]; Matsuda, Chihiro; Dong, Qiang ^[1]

---

1. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Miyamae 7-32, Kofu 400-8511 (Japan)

Li{sub 2}BaMgP{sub 2}O{sub 8} and Na{sub 2}BaMgP{sub 2}O{sub 8} were synthesized by a standard solid state reaction. Structural analyses have revealed that Li{sub 2}BaMgP{sub 2}O{sub 8} is a member of the olgite family, as is the case with Na{sub 2}BaMgP{sub 2}O{sub 8}. The layer-framework build up by corner-sharing MgO{sub 6} octahedra and PO{sub 4} tetrahedra twists around C{sub 3} axes to match the size of B-site cation (Li{sup +} or Na{sup +}). This twisting affects the coordination number for the B-site cation and unit cell size. Eu-doped Li{sub 2}BaMgP{sub 2}O{sub 8} and Na{sub 2}BaMgP{sub 2}O{sub 8} exhibited intense violet-blue emission under ultraviolet excitation. They were characterized by two emission centers; Eu{sup 2+} ions replacing A-site cations (Ba{sup 2+}) and B-site cations (Li{sup +} or Na{sup +}). The B-site Eu{sup 2+} emission was very sensitive to the twisting behavior caused by original B-site cation. - Graphical abstract: Emission properties of Eu{sup 2+}-doped M{sup I}{sub 2}BaMgP{sub 2}O{sub 8} (M{sup I}: Li, Na) are discussed from the viewpoint of the host crystal structure solved by X-ray powder diffraction technique and Raman spectroscopy. Highlights: Black-Right-Pointing-Pointer Olgite-type Li{sub 2}BaMgP{sub 2}O{sub 8} has been prepared by a solid state reaction. Black-Right-Pointing-Pointer Crystal structure of M{sup I}{sub 2}BaMgP{sub 2}O{sub 8} changes, depending on M{sup I} ion size. Black-Right-Pointing-Pointer Eu{sup 2+}-doped M{sup I}{sub 2}BaMgP{sub 2}O{sub 8} exhibits violet-blue emission under ultraviolet irradiation. Black-Right-Pointing-Pointer Emission from M{sup I}{sub 2}BaMgP{sub 2}O{sub 8} is characterized by two Eu{sup 2+} emission centers. Black-Right-Pointing-Pointer One emission component of the two is sensitive to the structural change induced by M{sup I}.

• OSTI ID: 22149962
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 196; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BARIUM IONS
CATIONS
CRYSTAL STRUCTURE
DOPED MATERIALS
EUROPIUM IONS
IRRADIATION
LITHIUM IONS
LUMINESCENCE
PHOSPHATES
RAMAN SPECTROSCOPY
SODIUM IONS
SOLIDS
X-RAY DIFFRACTION