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Neutron Rietveld Analysis for Optimized CaMgSi2O6:Eu2+ and its Luminescent Properties

  • Won Bin Im (a1), Yong-Il Kim (a2), Jong Hyuk Kang (a1), Duk Young Jeon (a1), Ha Kyun Jung (a3) and Kyeong Youl Jung (a3)...

Abstract

We optimized synthesis conditions of blue-emitting CaMgSi2O6:Eu2+ (CMS:Eu2+) with conventional solid-state reaction and successfully determined structure parameters by Rietveld refinement method with neutron powder diffraction data. The final weighted R-factor Rwp was 6.42% and the goodness-of-fit indicator S (= Rwp/Re) was 1.34. The refined lattice parameters of CMS:Eu2+ were a = 9.7472(3) Å, b = 8.9394(2) Å, and c = 5.2484(1) Å. The β angle was 105.87(1)°. The concentration quenching process was observed, and the critical quenching concentration of Eu2+ in CMS:Eu2+ was about 0.01 mol and critical transfer distance was calculated as 12 Å. With the help of the Rietveld refinement and Dexter theory, the critical transfer distance was also calculated as 27 Å. In addition, the dominant multipolar interaction of CMS:Eu2+ was investigated from the relationship between the emission intensity per activator concentration and activator concentration. The dipole–dipole interaction was a dominant energy transfer mechanism of electric multipolar character of CMS:Eu2+.

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Corresponding author

a) Address all correspondence to this author. e-mail: dyj@kaist.ac.kr

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1Youkosawa, N., Sato, G. and Nakazawa, E.: Improvement of luminescence degradation of PDP blue phosphor with new UV phosphor. J. Electrochem. Soc. 150, H197 (2003).
2Kunimoto, T., Yoshimatsu, R., Ohmi, K., Tanaka, S. and Kobayashi, H.: Feasibility study of silicate phosphor CaMgSi2O6:Eu2+ as blue PDP phosphor. IEICE Trans. Electron. E85–C,11 (2002).
3Im, W.B., Kang, J.H., Lee, D.C., Lee, S., Jeon, D.Y., Kang, Y.C. and Jung, K.Y.: Origin of PL intensity increase of CaMgSi2O6:Eu2+ phosphor after baking process for PDPs application. Solid State Commun. 133, 197 (2005).
4Larson, A.C. and Von Dreele, R.B.: General Structure Analysis System (GSAS). Los Alamos National Laboratory Report LAUR. 86, 748 (1994).
5Ropp, R.C.: Luminescence and the Solid State (Elsevier, the Netherlands, 1991), Chap. 8.
6Phosphor Handbook, edited by Shinoya, S. and Yen, W.M. (CRC Press, 1998), Chap. 5.
7Finger, L.W., Cox, D.E. and Jephcoat, A.P.: A correction for powder diffraction peak asymmetry due to axial divergence. J. Appl. Crystallogr. 27, 892 (1994).
8Levien, L. and Prewitt, C.T.: High-pressure structural study of diopside. Am. Mineral. 66, 315 (1981).
9Keskar, N.R. and Chelikowsky, J.R.: Structural properties of nine silica polymorphs. Phys. Rev. B 46, 1 (1992).
10Shannon, R.D.: Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallogr. A. 32, 751 (1976).
11Blasse, G. and Grabmaier, B.C.: Luminescent Materials (Springer-Verlag, Germany, 1994), Chap. 3.
12Dexter, D.L.: A theory of sensitized luminescence in solids. J. Chem. Phys. 21, 836 (1953).
13Blasse, G.: Energy transfer in oxidic phosphors. Philips Res. Pepts. 24, 131 (1969).
14Blasse, G.: Energy transfer between inequivalent Eu2+ ions. J. Solid State Chem. 62, 207 (1986).
15Shin, S.H., Jeon, D.Y. and Suh, K.S.: Charge-transfer nature in luminescence of YNbO4:Bi blue phosphor. J. Appl. Phys. 90, 12 (2001).
16Sohn, K.S., Cho, B.H. and Park, H.D.: Excitation energy-dependent photoluminescence behavior Zn2SiO4:Mn phosphors. Mater. Lett. 41, 303 (1999).
17Van Uitert, L.G.: Characterization of energy transfer interactions between rare earth ions. J. Electrochem. Soc. 114, 1048 (1967).
18Ozawa, L.: Cathodoluminescence: Theory and Applications (VCH, Japan, 1990), Chap. 6.

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