Comparison of YAG: Eu phosphors synthesized by supercritical water in batch and continuous reactors |
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Authors: | Min-Jae Yoon Yoan-Sang Bae Sang-Ha Son Jae-Wook Lee Chang-Ha Lee |
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Affiliation: | (1) Department of Chemical Engineering, Yonsei University, Seoul, 120-749, Korea;(2) Policy Division, Korea Institute of Geoscience & Mineral Resources, Daejeon, 305-350, Korea |
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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. |
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Keywords: | Supercritical Water Y3Al5O2 (YAG) Luminescent Properties Batch Reactor Continuous Reactor Nanoparticle Phosphors |
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