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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Pressureless Sintering of Luminescent CaAlSiN3:Eu Ceramics

I. Pricha1, W. Rossner1, R. Moos2

1 Siemens AG, Corporate Technology, Research & Technology Center, Otto-Hahn-Ring 6, 81739 Munich, Germany
2 Department of Functional Materials, University of Bayreuth, 95440 Bayreuth

received October 31, 2014, received in revised form December 31, 2014, accepted January 13, 2015

Vol. 6, No. 1, Pages 63-68   DOI: 10.4416/JCST2014-00047

Abstract

CaAlSiN3:Eu powder compacts were pressureless-sintered in a nitrogen atmosphere between 1400 and 1800 °C. The sintering behavior and the dependence of the luminescence properties on the sintering temperature were investigated. It is shown for the first time that it is possible to sinter CaAlSiN3:Eu ceramics that efficiently emit light starting from a micrometer-sized phosphor powder optimized for high luminescence efficiency. The maximum densities of the ceramics were achieved at ≥ 1700 °C and are limited to 80 % of the solid-state density owing to inhomogeneities of the powder compacts caused by the applied binder-free dry-pressing procedure. The phase composition of the ceramic specimens as well as the luminescence properties remained unchanged during sintering. These results demonstrate that pressureless sintering is suitable for fabricating CaAlSiN3:Eu bulk ceramics that can be used for LED applications.

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Keywords

CaAlSiN3:Eu, pressureless sintering, luminescence properties, LED

References

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