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Photostimulated luminescence from fluorochlorozirconate glass ceramics and the effect of crystallite size.
- Source :
- Journal of Applied Physics; 4/15/2005, Vol. 97 Issue 8, p083522, 8p, 1 Black and White Photograph, 6 Graphs
- Publication Year :
- 2005
-
Abstract
- We report the results from a study of europium-doped fluorochlorozirconate glasses that have been thermally processed to induce nucleation and crystallization of BaCl<subscript>2</subscript> crystallites. The resulting glass ceramics show a photostimulated luminescence (PSL) effect with a conversion efficiency which is up to 80% of that found in the commercial crystalline x-ray storage phosphor material BaFBr:Eu<superscript>2+</superscript>. Thermal processing for 20 min in the range 240–260 °C produces small (∼6–11 nm) hexagonal BaCl<subscript>2</subscript> crystallites, while temperatures in the range 270–290 °C lead to the formation and growth of larger (∼15–100 nm) orthorhombic BaCl<subscript>2</subscript> crystallites, as well as additional unidentified phases. We observe only weak PSL from glass ceramics containing hexagonal BaCl<subscript>2</subscript> (∼0.1% conversion efficiency compared to BaFBr:Eu<superscript>2+</superscript> at room temperature), but orthorhombic phase crystallites give rise to a much larger relative efficiency that increases with particle size, and reaches ∼80% for 100 nm diameter particles. The PSL is attributed to the excitation of electrons trapped as F centers in the BaCl<subscript>2</subscript> crystallites, while the dependence on crystallite size is consistent with a PSL-inert surface shell of thickness ∼7 nm surrounding the BaCl<subscript>2</subscript> crystallites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 97
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 16868301
- Full Text :
- https://doi.org/10.1063/1.1872193