Powder synthesis of Y-α-SiAlON and its potential as a phosphor host

Takayuki Suehiro, Hiroaki Onuma, Naoto Hirosaki, Rong Jun Xie, Tsugio Sato, Akira Miyamoto

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38 Citations (Scopus)

Abstract

The Y-α-SiAlON fine powders have been successfully synthesized from the system Y2O3-Al2O3-SiO 2, by using the gas-reduction-nitridation method. Completion of the nitridation was achieved at temperatures <1500 °C without unfavorable carbon contamination and SiC formation. While the presence of Y-containing intermediate phases inhibited the formation of pure α′ phase in the as-synthesized state, transient liquidphase formation promoted under the postsynthesis heat treatment enabled the preparation of near singlephase Y-α-SiAlON powders. The synthesized Y-α-SiAlON:Eu2+ powder exhibited a bright orange emission under near-UV to blue light excitation showing the applicability to the phosphor-converted white light-emitting diodes, whereas the quantum efficiency and the thermal stability were found to be low compared to the Ca-stabilized analogue. The first-principles calculations on the electronic structures of Y- and Ca-α-SiAlON: Eu2+ were performed for the first time, which clearly demonstrated the effects of modifying cations on their photoluminescent properties.

Original languageEnglish
Pages (from-to)1337-1342
Number of pages6
JournalJournal of Physical Chemistry C
Volume114
Issue number2
DOIs
Publication statusPublished - 2010 Jan 21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Suehiro, T., Onuma, H., Hirosaki, N., Xie, R. J., Sato, T., & Miyamoto, A. (2010). Powder synthesis of Y-α-SiAlON and its potential as a phosphor host. Journal of Physical Chemistry C, 114(2), 1337-1342. https://doi.org/10.1021/jp9096748