Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Structural, Morphological, and Optical Properties of LaNbO4:RE3+ (RE = Dy, Dy/Sm, Sm) Phosphors

LaNbO4:RE3+ (RE = Dy, Dy/Sm, Sm) 형광체의 구조, 표면, 광학 특성

  • Lee, Jinhong (Division of Materials Science and Engineering, Silla University) ;
  • Cho, Shinho (Division of Materials Science and Engineering, Silla University)
  • 이진홍 (신라대학교 신소재공학부) ;
  • 조신호 (신라대학교 신소재공학부)
  • Received : 2018.08.17
  • Accepted : 2018.08.31
  • Published : 2018.10.31
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Abstract

The effects of activator ion on the structural, morphological, and optical properties of $LaNbO_4:RE^{3+}$ (RE = Dy, Dy/Sm, Sm) phosphors were investigated. X-ray diffraction patterns exhibited that all the phosphors showed a monoclinic system with a main (112) diffraction peak, irrespective of the concentration and type of activator ions. The grain size showed a slightly decreasing tendency as the concentration of $Sm^{3+}$ ions increased. The excitation spectra of the $LaNbO_4:Dy^{3+}$, $Sm^{3+}$ phosphor powders consisted of a strong charge transfer band centered at 259 nm in the range of 220-290 nm and five weak peaks. The emission spectra of the $La_{0.95}NbO_4$:5 mol% $Dy^{3+}$ phosphors exhibited two intense yellow and blue bands centered at 575 nm and 479 nm respectively, which resulted from the $^4F_{9/2}{\rightarrow}^6H_{13/2}$ and $^4F_{9/2}{\rightarrow}^6H_{15/2}$ transitions of $Dy^{3+}$. As the concentration of $Sm^{3+}$ was increased, the intensity of the yellow emission band was gradually decreased, while those of orange and red emission bands centered at 604 and 646 nm began to appear and reached maxima at 5 mol%, and then decreased rapidly with further increases in the $Sm^{3+}$ concentration. These results indicated that white light emission could be realized by controlling the concentrations of the $Dy^{3+}$ and $Sm^{3+}$ ions incorporated into the $LaNbO_4$ host crystal.

Keywords

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Fig. 1. XRD patterns of LaNbO4 phosphors doped with Dy3+, Dy3+/Sm3+, and Sm3+.

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Fig. 2. SEM surface images of the LaNbO4 phosphors doped with (a) Dy3+, (f) Sm3+, and different Sm3+ concentrations of (b) 1, (c) 5, (d) 10 and (e) 15 mol% at a fixed 5 mol% Dy3+.

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Fig. 3. Excitation spectra of LaNbO4 phosphors doped with Dy3+ and Sm3+ (inset).

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Fig. 4. Excitation spectra of LaNbO4:Dy3+, Sm3+ phosphors doped with different concentrations of Sm3+.

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Fig. 5. Emission spectra of LaNbO4 phosphors doped with Dy3+ and Sm3+ (inset).

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Fig. 6. Emission spectra of LaNbO4:Dy3+, Sm3+ phosphors doped with different concentrations of Sm3+.

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Fig. 7. CIE chromaticity coordinates of the emissions generated from LaNbO4:Dy3+, Sm3+ phosphors doped with (1) 5 mol% Dy3+, (6) 5 mol% Sm3+, and (2) 1, (3) 5, (4) 10, and (5) 15 mol% Sm3+ at a fixed 5 mol% Dy3+.

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