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Luminescence enhancement of (Sr1-x Mx )2 SiO4 :Eu(2)(+) phosphors with M (Ca(2)(+) /Zn(2)(+) ) partial substitution for white light-emitting diodes.

Eu(2)(+) -doped Sr2 SiO4 phosphor with Ca(2)(+) /Zn(2)(+) substitution, (Sr1-x Mx )2 SiO4 :Eu(2)(+) (M = Ca, Zn), was prepared using a high-temperature solid-state reaction method. The structure and luminescence properties of Ca(2)(+) /Zn(2)(+) partially substituted Sr2 SiO4 :Eu(2)(+) phosphors were investigated in detail. With Ca(2)(+) or Zn(2)(+) added to the silicate host, the crystal phase could be transformed between the α-form and the β-form of the Sr2 SiO4 structure. Under UV excitation at 367 nm, all samples exhibit a broad band emission from 420 to 680 nm due to the 4f(6) 5d(1)  → 4f(7) transition of Eu(2)(+) ions. The broad emission band consists of two peaks at 482 and 547 nm, which correspond to Eu(2)(+) ions occupying the ten-fold oxygen-coordinated Sr.(I) site and the nine-fold oxygen-coordinated Sr.(II) site, respectively. The luminescence properties, including the intensity and lifetime of Sr2 SiO4 :Eu(2)(+) phosphors, improved remarkably on Ca(2)(+) /Zn(2)(+) addition, and promote its application in white light-emitting diodes. Copyright © 2016 John Wiley & Sons, Ltd.

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