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Optical Properties of MgMoO4:Dy3+,Eu3+ Phosphors Prepared with Different Eu3+ Molar Ratios

Eu3+ 이온의 몰 비 변화에 따른 MgMoO4:Dy3+,Eu3+ 형광체의 광학 특성

  • Kim, Jung Dae (School of Electrical Engineering, Korea University) ;
  • Cho, Shinho (Department of Materials Science and Engineering, Center for Green Fusion Technology, Silla University)
  • 김정대 (고려대학교 전기전자공학부) ;
  • 조신호 (신라대학교 신소재공학과 녹색융합기술센터)
  • Received : 2016.01.18
  • Accepted : 2016.02.22
  • Published : 2016.03.01

Abstract

The effects of $Eu^{3+}$ doping on the structural, morphological, and optical properties of $MgMoO_4:Dy^{3+},Eu^{3+}$ phosphors prepared by solid-state reaction technique were investigated. XRD patterns exhibited that all the synthesized phosphors showed a monoclinic system with a dominant (220) diffraction peak, irrespective of the content of $Eu^{3+}$ ions. The surface morphology of $MgMoO_4:Dy^{3+},Eu^{3+}$ phosphors was studied using scanning electron microscopy and the grains showed a tendency to agglomerate as the content of $Eu^{3+}$ ions increased. The excitation spectra of the phosphor powders were composed of a strong charge transfer band centered at 294 nm in the range of 230~340 nm and two intense peaks at 354 and 389 nm, respectively, arising from the $^6H_{15/2}{\rightarrow}^6P_{7/2}$ and $^6H_{15/2}{\rightarrow}^4M_{21/2}$ transitions of $Dy^{3+}$ ions. The emission spectra of the $Mg_{0.85}MoO_4$:10 mol% $Dy^{3+}$ phosphors without incorporating $Eu^{3+}$ ions revealed a strong yellow band centered at 573 nm resulting from the $^4F_{9/2}{\rightarrow}^6H_{13/2}$ transition of $Dy^{3+}$. As the content of $Eu^{3+}$ was increased, the intensity of the yellow emission was gradually decreased, while that of red emission band located at 614 nm began to appear, approached a maximum value at 10 mol%, and then decreased at 15 mol% of $Eu^{3+}$. These results indicated that white light emission could be achieved by controlling the contents of the $Dy^{3+}$ and $Eu^{3+}$ ions incorporated into the $MgMoO_4$ host crystal.

Keywords

Phosphor;Photoluminescence;Doping

Acknowledgement

Supported by : 신라대학교

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