Ceramics-Silikáty 46, (4) 121 - 126 (2002) |
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MICROSTRUCTURAL EFFECTS ON THE LUMINESCENCE INTENSITY OF Pr³⁺-doped CaTiO₃
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Boutinaud Philippe 1, Pinel Eric 1, Bertrand Genevieve 1,
Mahiou Rachid 1,
Jakubcová Petra 2,
Kasa Stanislav 2
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1 Laboratoire des Matériaux Inorganiques - UMR CNRS 6002. Université Blaise-Pascal et ENSCCF
Ensemble Scientifique des Cézeaux, 63177 Aubiere Cedex, France
2 Department of Glass and Ceramics
Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague, Czech Republic
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Keywords: CaTiO₃, Luminescence, Microstructure, Praseodymium
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The microstructural and luminescence characteristics of solid state (SS) and sol-gel (SG) processed CaTiO₃:Pr³⁺ powders
have been investigated as a function of the grinding time t, in the case of SSt samples and of OH/Ti(OPr)₄ molar ratios r, in
the case of SGr samples. It is observed that either extended post-synthesis grinding or sol-gel syntheses operated under acid
or neutral conditions lead to submicron grained microstructures, CaTiO₃ + TiO₂ phase mixing and finally to less efficient
phosphors. The observed decrease of luminescence intensity is correlated to the presence of non-luminescent rutile and to the
amount of submicron particles. |
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