Enhanced luminescence of Sr Si2 O2 N2: Eu2+ phosphors by codoping with Ce3+, Mn2+, and Dy3+ ions

Ru Shi Liu, Yu Huan Liu, Nitin C. Bagkar, Shu Fen Hu

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Abstract

The authors report here the enhanced luminescence properties of Sr Si2 O2 N2 doped with Eu and M (M=Ce, Dy, and Mn). The Eu and Eu, Mn-codoped powders were prepared by a solid state reaction at temperatures between 1400 and 1600 °C under H2 (25%) - N2 (75%) atmosphere. The Eu, M -codoped Sr1-x-y Si2 N2 O2 phosphors have the monoclinic structure with lattice parameters a∼15.6 Å, b∼16.2 Å, c∼9.4 Å, and Β∼91°. The phosphors can be efficiently excited in the UV to visible region, making them attractive as conversion phosphors for a light emitting diode application. A green-yellow emission was observed for Eu,M -codoped Sr1-x-y Si2 N2 O2. The addition of M in the Eu site in Sr Si2 O2 N2 remarkably enhances the luminescent intensity by the factor of 144%, 148%, and 168% for Ce, Dy, and Mn, respectively.

Original languageEnglish
Article number061119
JournalApplied Physics Letters
Volume91
Issue number6
DOIs
Publication statusPublished - 2007 Aug 17

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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