Vapour Phase Synthesis of Nanocrystalline In Situ YAG:Ce |
| Journal |
Solid State Phenomena (Volume 128) |
| Volume |
Doped Nanopowders |
| Edited by |
Witold Ċojkowski and John R. Blizzard, Urszula Narkiewicz and Janusz D. Fidelus |
| Pages |
7-12 |
| DOI |
10.4028/www.scientific.net/SSP.128.7 |
| Online since |
October, 2007 |
| Authors |
Heiko Paul,
Harald Kaps,
Thomas Gleich,
Vahid Raeesi,
Ulrich Herr,
M. Zachau
|
| Keywords |
Nano-YAG, Optical Property, Phase Formation, Phosphor, Simulation, YAG:Ce |
| Abstract |
Nano-crystalline YAG:Ce (Y3Al5O12:Ce) with an average particle size of 10-50 nm was
synthesized by the vapour phase reaction (CVR) in a hot-wall reactor. This nano-crystalline
luminescent material has the advantage of a high light-conversion efficiency associated with
superior light-scattering properties. Phases and compositions were analyzed by XRD and EDX,
respectively. Photoluminescence was used to investigate the optical properties of the YAG host
lattice doped with Cerium. As a first step the conditions for the in-situ production of the YAG
phase were established. On the basis of previous DSC investigations of YAG phase formation, the
DSC results were analyzed according to the Kissinger theory for thermally activated
transformations. From the results it is predicted that, with sufficient heat transfer during the
residence time of the particles in the hot zone of the reactor, YAG can be obtained in-situ during the
CVR process. By modifying the parameters and the CVR setup it was possible to achieve
conditions, which allow the production of in-situ YAG. Samples with Ce doping concentrations
ranging from 0 to 2.65 at.% Ce were prepared to investigate the influence of the doping
concentration on the luminescence of YAG:Ce. |
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