Synthesis and VUV-UV spectroscopic properties of rare earth borosilicate oxyapatite: RE {sub 5}Si{sub 2}BO{sub 13}:Ln {sup 3+} (RE=La, Gd, Y; Ln=Eu, Tb)

Journal Article · Sun Apr 15 00:00:00 EDT 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.01.033· OSTI ID:21015785

Junlin, Yuan ^[1]; Zhijun, Zhang ^[1]; Xiaojun, Wang ^[1]; Haohong, Chen ^[1]; Guobin, Zhang ^[2]; Chaoshu, Shi ^[2]

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1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
2. NSRL, University of Science and Technology of China, Hefei 230027 (China)

Three rare earth borosilicate oxyapatites, RE {sub 5}Si{sub 2}BO{sub 13} (RE=La, Gd, Y), were synthesized via wet chemical method, of which RE {sub 5}Si{sub 2}BO{sub 13} (RE=Gd, Y) were first reported in this work. In the three oxyapatites, [BO{sub 4}] and [SiO{sub 4}] share the [TO{sub 4}] tetrahedral oxyanion site, and RE {sup 3+} ions occupy all metal sites. The differential scanning calorimetry-thermo gravimetry measurements and high temperature powder X-ray diffraction pattern revealed a vitrification process within 300-1200 deg. C, which was due to the glass-forming nature of borosilicates. From the VUV excitation spectra of Eu{sup 3+} and Tb{sup 3+} in RE {sub 5}Si{sub 2}BO{sub 13}, the optical band gaps were found to be 6.31, 6.54 and 6.72 eV for RE {sub 5}Si{sub 2}BO{sub 13} (RE=La, Gd, Y), respectively. The emission and excitation bands of Eu{sup 3+} and Tb{sup 3+} are discussed relating with their coordination environments. Among the three hosts, Y{sub 5}Si{sub 2}BO{sub 13} would be the best for Eu{sup 3+} and Tb{sup 3+}-doped phosphors. - Graphical abstract: The perspective view of RE {sub 5}Si{sub 2}BO{sub 13} (RE=La, Gd, Y) oxyapatite along [001] direction. All non-tetrahedral metal sites are occupied by RE {sup 3+}, and the tetrahedral sites by SiO{sub 4} and BO{sub 4} groups. Y{sub 5}Si{sub 2}BO{sub 13} is a good host for both Eu{sup 3+} and Tb{sup 3+} activated phosphors.

• OSTI ID: 21015785
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 4; Other Information: DOI: 10.1016/j.jssc.2007.01.033; PII: S0022-4596(07)00066-7; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
APATITES
BORATES
BORON SILICATES
BOROSILICATE GLASS
CALORIMETRY
DOPED MATERIALS
EUROPIUM IONS
EV RANGE 01-10
FAR ULTRAVIOLET RADIATION
GRAVIMETRY
PHOSPHORS
RARE EARTH COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TERBIUM IONS
VITRIFICATION
X-RAY DIFFRACTION