J. Ballato—contributing editor
Samarium-Doped Fluorochlorozirconate Glass–Ceramics as Red-Emitting X-Ray Phosphors
Article first published online: 29 SEP 2010
© 2010 The American Ceramic Society
Journal of the American Ceramic Society
Volume 94, Issue 2, pages 543–550, February 2011
How to Cite
Koughia, C., Edgar, A., Varoy, C. R., Okada, G., von Seggern, H., Belev, G., Kim, C.-Y., Sammynaiken, R. and Kasap, S. (2011), Samarium-Doped Fluorochlorozirconate Glass–Ceramics as Red-Emitting X-Ray Phosphors. Journal of the American Ceramic Society, 94: 543–550. doi: 10.1111/j.1551-2916.2010.04110.x
This work was financially supported by the NSERC and the New Zealand Foundation for Research Science and Technology.
- Issue published online: 7 FEB 2011
- Article first published online: 29 SEP 2010
- Manuscript No. 27578. Received March 2, 2010; approved August 2, 2010.
We have examined the photoluminescence (PL) and X-ray luminescence (XL) of fluorochlorozirconate (FCZ) glass–ceramics (FCZ-GC) doped with Sm3+ and Sm2+ ions. Sm-doped FCZ-GCs have been prepared by annealing a ZBLAN glass of nominal composition 53% ZrF4, 20% NaF, 3% AlF3, 3% LaF3, 1% SmF3, 1% BaF2, 19% BaCl2 (mol%) above the glass transition of the host glass matrix. SmF3 was added to the initial glass mix for trivalent samarium doping. Sm2+ doping was achieved by reducing Sm3+ to Sm2+ during the melting of the initial mix by the addition of NaBH4. FCZ-GC contains BaCl2 nanocrystals formed during the annealing with embedded Sm2+ ions, which dominate PL and XL. The PL of Sm2+ ions embedded in BaCl2 nanocrystals strongly depends on their crystal structure (hexagonal or orthorhombic) and may be used to identify that structure. The correlation of the PL spectra with X-ray diffraction data is used to estimate the size of nanocrystals. The nanocrystals with average dimensions <∼30 nm are mainly hexagonal while larger crystals are mostly orthorhombic. XL is more efficient in glass–ceramics containing relatively large BaCl2 nanocrystals with hexagonal crystal structure.