J. Ballato—contributing editor
Crystal Structure and Photoluminescence Properties of Red-Emitting Ca9La1−x(VO4)7:xEu3+ Phosphors for White Light-Emitting Diodes
Article first published online: 12 AUG 2010
© 2010 The American Ceramic Society
Journal of the American Ceramic Society
Volume 93, Issue 12, pages 4081–4086, December 2010
How to Cite
Liu, L., Xie, R.-J., Hirosaki, N., Li, Y., Takeda, T., Zhang, C.-N., Li, J. and Sun, X. (2010), Crystal Structure and Photoluminescence Properties of Red-Emitting Ca9La1−x(VO4)7:xEu3+ Phosphors for White Light-Emitting Diodes. Journal of the American Ceramic Society, 93: 4081–4086. doi: 10.1111/j.1551-2916.2010.03994.x
This work was supported in part by Grants-in-Aid for Scientific Research from KAKENHI (No. 208551), the Program for New Century Excellent Talents in University (No. NCET-25-0290), the National Natural Science Foundation of China (No. 50672014 and No. 50972025), and Changjiang Scholars and Innovative Research Team in University (IRT0713).
- Issue published online: 1 DEC 2010
- Article first published online: 12 AUG 2010
- Manuscript No. 27738. Received March 24, 2010; approved June 14, 2010.
This paper reports the crystal structure and photoluminescence properties of Ca9La1−x(VO4)7:xEu3+ (x=0–1) phosphors synthesized at various temperatures (850°–1350°C) in air for 12 h using traditional solid-state reaction method. Rietveld refinement of powder X-ray diffraction pattern of Ca9Eu(VO4)7 indicated that the structure of Ca9Eu(VO4)7 consisted of [VO4] tetrahedra and Ca/Eu atoms were filled in the space between the tetrahedral groups, with a random distribution for Eu3+ ions on four individual Ca crystallographic sites. A major intense sharp emission line, locating at 613 nm under 465 nm excitation, was observed due to the 5D0−7F2 transition of Eu3+ within 4f configurations, which originates from the lower site symmetry in Ca9La1−x(VO4)7:xEu3+. Interestingly, no concentration quenching was found in this phosphor, and thermal quenching was nearly not affected by Eu3+ concentration. The experimental results suggested that this novel red-emitting phosphor could be applied in white light-emitting diodes.