A new promising phosphor, Na{sub 3}La{sub 2}(BO{sub 3}){sub 3}:Ln (Ln=Eu, Tb)

Journal Article · Thu Dec 15 04:00:00 EST 2005 · Journal of Solid State Chemistry

OSTI ID:20784806

Zhihua, Li ^[1]; Jinghui, Zeng ^[1]; Guochun, Zhang ^[2]; Yadong, Li ^[1]

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1. Department of Chemistry, Tsinghua University, Beijing 100084 (China)
2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, P.O. Box 2711, Beijing 100080 (China)

We present an efficient way to search a host for ultraviolet (UV) phosphor from UV nonlinear optical (NLO) materials. With the guidance, Na{sub 3}La{sub 2}(BO{sub 3}){sub 3} (NLBO), as a promising NLO material with a broad transparency range and high damage threshold, was adopted as a host material for the first time. The lanthanide ions (Tb{sup 3+} and Eu{sup 3+})-doped NLBO phosphors have been synthesized by solid-state reaction. Luminescent properties of the Ln-doped (Ln=Tb{sup 3+}, Eu{sup 3+}) sodium lanthanum borate were investigated under UV ray excitation. The emission spectrum was employed to probe the local environments of Eu{sup 3+} ions in NLBO crystal. For red phosphor, NLBO:Eu, the measured dominating emission peak was at 613 nm, which is attributed to {sup 5} D -{sup 7} F {sub 2} transition of Eu{sup 3+}. The luminescence indicates that the local symmetry of Eu{sup 3+} in NLBO crystal lattice has no inversion center. Optimum Eu{sup 3+} concentration of NLBO:Eu{sup 3+} under UV excitation with 395 nm wavelength is about 30 mol%. The green phosphor, NLBO:Tb, showed bright green emission at 543 with 252 nm excited light. The measured concentration quenching curve demonstrated that the maximum concentration of Tb{sup 3+} in NLBO was about 20%. The luminescence mechanism of Ln-doped NLBO (Tb{sup 3+} and Eu{sup 3+}) was analyzed. The relative high quenching concentration was also discussed.

• OSTI ID: 20784806
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORATES
CRYSTAL LATTICES
CRYSTALS
DOPED MATERIALS
EMISSION SPECTRA
EUROPIUM COMPOUNDS
EUROPIUM IONS
EXCITATION
FLUORESCENCE
LANTHANUM COMPOUNDS
PHOSPHORS
QUENCHING
SODIUM COMPOUNDS
SYMMETRY
TERBIUM COMPOUNDS
TERBIUM IONS
ULTRAVIOLET RADIATION