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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 10, 2006
Accepted January 30, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comparison of YAG: Eu phosphors synthesized by supercritical water in batch and continuous reactors

Min-Jae Yoon¹ Youn-Sang Bae¹ Sang-Ha Son¹ Jae-Wook Lee^{1 2} Chang-Ha Lee^1†

¹Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea ²Policy Division, Korea Institute of Geoscience & Mineral Resources, Daejeon 305-350, Korea

Korean Journal of Chemical Engineering, September 2007, 24(5), 877-880(4), 10.1007/s11814-007-0058-y

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Abstract

Luminescent yttrium aluminum garnet (YAG, Y3Al5O12) nanoparticles doped with Eu (10 at%) were synthesized in batch-type and continuous-type supercritical water (SCW) reactors. In the case of the continuous-type SCW method, the particles of YAG : Eu phosphors were much smaller and demonstrated a uniform spherical-like shape. Inversely, in the case of the batch-type SCW method, a needle-like or elliptical-like shape was formed because a finite amount of time was required to reach SCW conditions from ambient conditions. However, the emission intensity of YAG : Eu phosphors synthesized by using the batch-type SCW method was stronger. Therefore, it is concluded that the continuous-type SCW method is superior to the batch-type SCW method from the viewpoint of the particle size and shape, but the luminescence property of phosphors in the continuous-type SCW method needs to be improved. In addition, a calcination process slightly improved the luminescence intensities of YAG : Eu phosphors generated by using either the batch-type or continuous-type SCW methods.

Keywords

Supercritical Water Y3Al5O12 (YAG) Luminescent Properties Batch Reactor Continuous Reactor Nanoparticle Phosphors

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