Nakamura, T. and Takeyama, T. and Takahashi, N. and Jagannathan, R. and Karthikeyani, A. and Smith, G.M. and Riedi, P.C. (2003) High-frequency EPR investigation of X-ray storage SrBPO5:Eu phosphor. Journal of Luminescence. pp. 369-372.

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Abstract

High-frequency EPR (HFEPR) spectra of the SrBPO5:Eu with stillwellite structure, which was prepared using EuCl3.6H2O as a dopant, have been examined in order to clarify the Eu sites in it. They showed an intense doublet at 3.3T corresponding to g ¼ 2:0 as is expected for the 8S state ions. Also, weak satellites were observed on both sides of the central doublet signal symmetrically. This means that microwave energy at 90GHz is sufficiently larger than the zero-field splitting. Taking into account the crystal structure of stillwellite and the earlier PL investigation, a single Eu2+ site was assumed for the HFEPR simulation. As a result, it was found that HFEPR spectrum simulated using g ¼ 1:98161; 7D7 ¼ 0:130T and l ¼ 7E=D7 ¼ 0:06 reasonably agrees well with the experimental one, supporting that the Eu2+ occupies the Sr site. The large 7D7 value small l value obtained implies that the crystal field surrounding Eu2+ has a strong axial field with weak rhombic distortion.

Item Type:	Article
Uncontrolled Keywords:	HFEPR; Europium(II); X-ray storage phosphor; Stillwellite
Subjects:	Electrochemical Materials Science
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	24 Mar 2012 07:36
Last Modified:	24 Mar 2012 07:36
URI:	http://cecri.csircentral.net/id/eprint/879

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