Title of article
The effect of replacement of Sr by Ca on the structural and luminescence properties of the red-emitting Sr2Si5N8:Eu2+ LED conversion phosphor
Author/Authors
Y.Q. Li، نويسنده , , G. de With، نويسنده , , H.T. Hintzen، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
10
From page
515
To page
524
Abstract
The influence of the replacement of Sr by Ca on structural and luminescence properties of Eu2+-doped Sr2Si5N8 is reported. The Rietveld refinement of the powder X-ray diffraction data shows that the Ca2+ ion preferentially occupies the larger Sr site in Sr2Si5N8:Eu2+. Although the excitation spectrum is hardly modified, the position of the emission band of Eu2+ can be tailored through partial replacement of Sr by Ca in Sr2Si5N8:Eu2+, resulting in red-emission shifting from 620 to 643 nm. Furthermore, (Sr, Ca)2Si5N8:Eu2+ shows high potential as a conversion phosphor for white-light LED applications due to similar absorption, conversion efficiency and thermal quenching behaviour for 465 nm excitation after the introduction of the Ca ion.
Keywords
Alkaline-earth-silicon-nitride , Europium , Strontium , X-ray powder diffraction , Luminescence , White-light LEDs , calcium , Phosphor , Rietveld refinement
Journal title
JOURNAL OF SOLID STATE CHEMISTRY
Serial Year
2008
Journal title
JOURNAL OF SOLID STATE CHEMISTRY
Record number
1333096
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