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Crystal structures and enhancement of photoluminescence intensities by effective doping for lithium tantalate phosphors

Published online by Cambridge University Press:  02 September 2015

Hiroaki Ichioka
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Shohei Furuya
Affiliation:
Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580, Japan
Toru Asaka
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Hiromi Nakano
Affiliation:
Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580, Japan
Koichiro Fukuda
Affiliation:
Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Corresponding

Abstract

Crystal structures of (Li0.925Eu3+ 0.025)TaO3, (Li0.968Eu3+ 0.032)(Ta0.81Ti0.19)O2.937, (Li0.967Sm3+ 0.033)(Ta0.89Ti0.11)O2.978, and (Li0.950Sm3+ 0.033Mg0.017)(Ta0.89Ti0.11)O2.987 were investigated by X-ray powder diffraction. The initial structural parameters, taken from those of the isomorphous compound (Li0.977Eu3+ 0.023)(Ta0.89Ti0.11)O2.968 (space group R3c and Z = 6), were refined by the Rietveld method. A pattern-fitting method based on the maximum-entropy method was subsequently used to determine the three-dimensional electron-density distributions (EDDs) that are free from the structural bias. We confirmed that the EDDs are in accord with the resulting structural models, each of which was composed of the [(Ta, Ti)O6] octahedron and [(Li, Eu, Sm, Mg)O12] polyhedron. We compared these polyhedra and found that the prominent difference among these compounds was the centroid-to-(Li, Eu, Sm, Mg) distance (eccentricity) of [(Li, Eu, Sm, Mg)O12]. The high correlation was demonstrated between the magnitude of eccentricity and photoluminescence intensity under near ultraviolet excitation.

Type
Technical Articles
Copyright
Copyright © International Centre for Diffraction Data 2015 

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References

Agulyanskii, A. l., Bessonova, V. A., Kuznetsov, V. Ya., and Kalinnikov, V. T. (1986). “Double oxide fluorides with a sodium chloride structure,” Russ. J. Inorg. Chem. 31, 15481549.Google Scholar
Balic-Zunic, T. and Vickovic, I. (1996). “IVTON – a program for the calculation of geometrical aspects of crystal structures and some crystal chemical applications,” J. Appl. Crystallogr. 29, 305306.CrossRefGoogle Scholar
Brindley, G. W. (1945). “A theory of X-ray absorption in mixed powders,” Philos. Mag. 36, 347369.CrossRefGoogle Scholar
Dillip, G. R., Kumar, P. M., Raju, B. D. P., and Dhoble, S. J. (2013). “Synthesis and luminescence properties of a novel Na6CaP2O9:Sm3+ phosphor,” J. Lumin. 134, 333338.CrossRefGoogle Scholar
Hsu, R., Maslen, E. N., Du Boulay, D., and Ishizawa, N. (1997). “Synchrotron X-ray studies of LiNbO3 and LiTaO3 ,” Acta Crystallogr., Sect. B: Struct. Sci. 53, 420428.CrossRefGoogle Scholar
Izumi, F. and Momma, K. (2007). “Three-dimensional visualization in powder diffraction,” Solid State Phenom. 130, 1520.CrossRefGoogle Scholar
Izumi, F., Kumazawa, S., Ikeda, T., Hu, W.-Z., Yamamoto, A., and Oikawa, K. (2001). “MEM-based structure-refinement system REMEDY and its applications,” Mater. Sci. Forum 378–381, 5964.CrossRefGoogle Scholar
Krylov, E. I. and Strelina, M. M. (1963). “Orthotantalates of lanthanum, samarium, and europium,” Russ. J. Inorg. Chem. 8, 11801182.Google Scholar
Leonidov, I. A., Leonidova, O. N., Perelyaeva, L. A., Samigullina, R. F., Kovyazina, S. A., and Patrakeev, M. V. (2003). “Structure, ionic conduction, and phase transformations in lithium titanate Li4Ti5O12 ,” Phys. Solid State 45, 21832188.CrossRefGoogle Scholar
Makovicky, E. and Balic-Zunic, T. (1998). “New measure of distortion for coordination polyhedra,” Acta Crystallogr. Sect. B: Struct. Sci. B54, 766773.CrossRefGoogle Scholar
Momma, K. and Izumi, F. (2011). “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr. 44, 12721276.CrossRefGoogle Scholar
Momma, K., Ikeda, T., Belik, A. A., and Izumi, F. (2013). “Dysnomia, a computer program for maximum-entropy method (MEM) analysis and its performance in the MEM-based pattern fitting,” Powder Diffr. 28, 184193.CrossRefGoogle Scholar
Nakano, H., Ozono, K., Hayashi, H., and Fujihara, S. (2012). “Synthesis and luminescent properties of a new Eu3+-Doped Li1 + x (Ta1 zNbz)1 x Ti x O3 red phosphor,” J. Am. Ceram. Soc. 95, 27952797.CrossRefGoogle Scholar
Nakano, H., Suehiro, S., Furuya, S., Hayashi, H., and Fujihara, S. (2013). “Synthesis of new RE3+ doped Li1 + x Ta1−x Ti x O3 (RE: Eu, Sm, Er, Tm, and Dy) phosphors with various emission colors,” Materials 6, 27682776.CrossRefGoogle Scholar
Rietveld, H. M. (1967). “Line profiles of neutron powder-diffraction peaks for structure refinement,” Acta Crystallogr. 22, 151152.CrossRefGoogle Scholar
Sakirzanovas, S., Katelnikovas, A., Bettentrup, H., Kareiva, A., and Jüstel, T. (2011). “Synthesis and photoluminescence properties of Sm3+-doped LaMgB5O10 and GdMgB5O10 ,” J. Lumin. 131, 15251529.CrossRefGoogle Scholar
Takata, M., Nishibori, E., and Sakata, M. (2001). “Charge density studies utilizing powder diffraction and MEM. Exploring of high Tc superconductors, C60 superconductors and manganites,” Z. Kristallogr. 216, 7186.Google Scholar
Uchida, T., Suehiro, S., Asaka, T., Nakano, H., and Fukuda, K. (2013). “Syntheses and crystal structures of Li(Ta0.89Ti0.11)O2.945 and (Li0.977Eu0.023)(Ta0.89Ti0.11)O2.968 ,” Powder Diffr. 28, 178183.CrossRefGoogle Scholar
Young, R. A. (1993). “Introduction to the Rietveld method,” in The Rietveld Method, edited by Young, R. A. (Oxford University Press, Oxford, U.K.), pp. 138.Google Scholar
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