Luminescence characteristics of Sr1−xBaxSi2O2N2:Eu2+ phosphors for white light emitting diodes

Authors

  • G. Anoop,

    1. Display Materials Laboratory, School of Chemical Engineering and Materials Science, Chung-Ang University, Heukseok-Dong 221, Dongjak-gu, Seoul 156–756, South Korea
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    • These authors contributed equally to the work.

  • I. H. Cho,

    1. Display Materials Laboratory, School of Chemical Engineering and Materials Science, Chung-Ang University, Heukseok-Dong 221, Dongjak-gu, Seoul 156–756, South Korea
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    • These authors contributed equally to the work.

  • D. W. Suh,

    1. Display Materials Laboratory, School of Chemical Engineering and Materials Science, Chung-Ang University, Heukseok-Dong 221, Dongjak-gu, Seoul 156–756, South Korea
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  • J. S. Yoo

    Corresponding author
    1. Display Materials Laboratory, School of Chemical Engineering and Materials Science, Chung-Ang University, Heukseok-Dong 221, Dongjak-gu, Seoul 156–756, South Korea
    • Phone: +82-2-822-0635, Fax: +82-2-824-3495
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Abstract

Sr1−xBaxSi2O2N2:Eu2+ phosphors were synthesized using high temperature solid state reaction. The effect of Ba incorporation on the structural and luminescence characteristics of SrSi2O2N2:Eu2+ phosphors were studied. The phosphors were crystallized in triclinic crystal structure and the cell volume increases monotonically with Ba addition. The PL emission peak wavelength red shifts with Ba up to x = 0.50 beyond which no red shift is observed. The XPS analysis shows that nitrogen is being incorporated into the host lattice along with Ba addition up to x = 0.50. The as synthesized phosphors show high thermal stability. Phosphor converted light emitting diodes were realized using Sr1−xBaxSi2O2N2:Eu2+ phosphors (x = 0 and x = 0.40) showing luminance efficacies of 108 and 101 lm W−1.

original image

The CIE chromaticity coordinates of Sr1−xBaxSi2O2N2:Eu (x = 0 and x = 0.40) phosphors.

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