Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Luminescent Properties and Energy Transfer Efficiency of BaWO4:Dy3+, Eu3+ White Light-Emitting Phosphors

BaWO4:Dy3+,Eu3+ 백색광 형광체의 발광 특성과 에너지 전달 효율

  • Cho, Shinho (Department of Materials Science and Engineering, Silla University)
  • 조신호 (신라대학교 신소재공학과)
  • Received : 2021.05.21
  • Accepted : 2021.06.27
  • Published : 2021.06.30
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Abstract

Dy3+- and Eu3+-codoped BaWO4 phosphors for white light-emitting diode were synthesized with different activator ions via a solid-state reaction process. The structural, morphological, and optical properties of the BaWO4:Dy3+,Eu3+ phosphors were investigated as a function of Eu3+ concentration at a fixed concentration of Dy3+ ions. XRD patterns exhibited that all the synthesized phosphors had a tetragonal system, irrespective of the concentrations of Dy3+ and Eu3+ ions. The excitation spectra of the synthesized phosphors were composed of three intense bands centered at 251, 355, and 393 nm and several weak peaks. For the BaWO4:Dy3+,Eu3+ phosphors synthesized with 1 mol% of Eu3+, the emission spectra under ultraviolet excitation at 393 nm showed two strong blue and yellow bands at 485 and 577 nm corresponding to the 4F9/26H15/2 and 4F9/26H13/2 transitions of Dy3+ ions, respectively and several weak bands in the range of 600-700 nm resulting from the 4f transitions of Eu3+ ions. As the concentration of Eu3+ ions increased, intensities of the blue and yellow emission bands gradually decreased while those of the red emissions increased rapidly and the energy transfer efficiency from Dy3+ to Eu3+ ions was 95.3% at 20 mol% of Eu3+. The optimum white light emission with x=0.363, y=0.357 CIE 1931 chromaticity coordinates was obtained for the sample doped with 5 mol% Dy3+ and 1 mol% of Eu3+.

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References

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