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

Min Jae Yoon, Yoan Sang Bae, Sang Ha Son, Jae Wook Lee, Chang Ha Lee

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Abstract

Luminescent yttrium aluminum garnet (YAG, Y3Al5O 12) 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.

Original languageEnglish
Pages (from-to)877-880
Number of pages4
JournalKorean Journal of Chemical Engineering
Volume24
Issue number5
DOIs
Publication statusPublished - 2007 Sep 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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