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Advances in Materials Science and Engineering
Volume 2014, Article ID 819057, 7 pages
http://dx.doi.org/10.1155/2014/819057
Research Article

Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors

1School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China
2School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, China

Received 19 March 2014; Accepted 15 July 2014; Published 5 August 2014

Academic Editor: Somchai Thongtem

Copyright © 2014 H. H. Xiong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Single-phased Sm3+ doped lanthanum calcium borate (SmxLa2−xCaB10O19, SLCB, ) polycrystalline red phosphor was prepared by solid-state reaction method. The phosphor has two main excitation peaks located at 398.5 nm and 469.0 nm, which are nicely in accordance with the emitting wavelengths of commercial near-UV and blue light emitting diode chips. Under the excitation of 398.0 nm, the dominant red emission of Sm3+ in SLCB phosphor is centered at 598.0 nm corresponding to the transition of 4G5/2 6H7/2. The Eu3+ fluorescence in the red spectral region is applied as a spectroscopic probe to reveal the local site symmetry in the host lattice and, hence, Judd-Ofelt parameters of Eu3+ in the phosphor matrix are derived to be and  cm2, indicating a high asymmetrical and strong covalent environment around rare earth luminescence centers. Herein, the red phosphors are promising good candidates employed in white light emitting diodes (LEDs) illumination.