Articles
  • The influence of processing parameters on structural and luminescent characteristics of an Eu2+-doped Sr-Si-O-N system
  • Dong Wook Suh, Gopinathan Anoop, In Hyun Cho, Jae Soo Yoo, Soo Young Kim and See Hee Shin*
  • School of Chemical Engineering and Materials Science, Chung-Ang University, 221, Heukseok-Dong, Dongjak-gu, Seoul 156- 756, Korea
Abstract
Eu2+-doped Sr-Si-O-N material phosphors were synthesized using a high temperature solid state reaction. High solubility of nitrogen in an oxynitride system is known as a labored process when it occurs under high nitrogen pressure. The factors influencing structural and luminescent characteristics of Eu2+-doped SrSi2O2N2 system have been investigated in detail. In a SrSi2O2N2 system, the peak emission spectra change with processing parameters such as gas flow rate, which results in a different O/N ratio. The optical and structural properties are also dependent upon the reaction temperature and reaction period. For instance, the SrSi2O2N2:Eu2+ system is converted into a Sr2Si5N8-αOα system when exposed to a longer reaction at higher temperature. XPS and FTIR analyses confirm the variation in structural changes which affect the emission wavelength of the phosphor. This metamorphosis seems to be related to the unstable longevity of oxynitride material phosphors.

Keywords: Oxynitride, Phosphor, LED, Spectrum.

This Article

  • 2013; 14(1): 139-143

    Published on Feb 28, 2013

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