Synthesis and Red Emission of NaY(WO4)2 Phosphor with Lithium and Europium Dopants

doi:10.3724/SP.J.1077.2013.13168

Abstract

Abstract: Li and/or Eu doped NaY(WO₄)₂ phosphors with red emission were synthesized by the solid-state reaction method and characterized by X-ray powder diffraction (XRD) and ultraviolet-visible luminescence. Pure products were obtained at 1100℃ and maintained only in the range of about 100℃. Different from the reported phosphors obtained by combustion, the luminescence of the Eu³⁺ doped samples show the concentration quenching with the maximum emission intensity at 9mol%. The electric dipole transition of ⁵D₀→⁷F₂ of Eu³⁺ under 393 nm excitation dominates the emission spectra, which is good for overcoming the lack of red component in white light LED. Lithium doped does not change the preference but control the intensity of red emission. Appropriate concentration of lithium can improve the red emission but decrease while excess or deficient, and it takes the maximum red intensity at 30mol% Li doped. The tendency can be attributed to the competition between the effects of increasing lattice defect and the enhancement of non-centrosymmetry of Y atom site.

Key words: NaY(WO₄)₂, Eu doped, Li doped, white light LED, phosphor

CLC Number:

TQ174

LI Meng-Na, LEI Fang, CHEN Hao-Hong, SHI Ying, ZHAO Jing-Tai. Synthesis and Red Emission of NaY(WO₄)₂ Phosphor with Lithium and Europium Dopants[J]. Journal of Inorganic Materials, 2013, 28(12): 1281-1285.

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Synthesis and Red Emission of NaY(WO₄)₂ Phosphor with Lithium and Europium Dopants

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