Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Upconversion luminescence from poly-crystalline Yb3+, Er3+ co-doped NaGd(MoO4)2 by simple solid state method

Er3+, Yb3+ 이온이 동시 도핑된 NaGd(MoO4)2의 업컨버젼 분석

  • Kang, Suk Hyun (Division of Materials Science and Engineering, Hanyang University) ;
  • Kang, Hyo Sang (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Hee Ae (Division of Materials Science and Engineering, Hanyang University) ;
  • Shim, Kwang Bo (Division of Materials Science and Engineering, Hanyang University)
  • 강석현 (한양대학교 신소재공학과) ;
  • 강효상 (한양대학교 신소재공학과) ;
  • 이희애 (한양대학교 신소재공학과) ;
  • 심광보 (한양대학교 신소재공학과)
  • Received : 2016.08.11
  • Accepted : 2016.08.19
  • Published : 2016.08.31
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Abstract

Up-conversion (UC) luminescence properties of polycrystalline $Er^{3+}/Yb^{3+}$ doped $NaGd(MoO_4)_2$ phosphors synthesized by a simple solid-state reaction method were investigated in detail. Used to 980 nm excitation (InfraRed area), $Er^{3+}/Yb^{3+}$ co-doped $NaGd(MoO_4)_2$ exhibited very weak red emissions near 650 and 670 nm, and very strong green UC emissions at 540 and 550 nm corresponding to the infra 4f transitions of $Er^{3+}(^4F_{9/2},\;^2H_{11/2},\;^4S_{3/2}){\rightarrow}Er^{3+}(^4I_{15/2})$. The optimum doping concentration of $Er^{3+}$, $Yb^{3+}$ for highest emission intensity was determined by XRD and PL analysis. The $Er^{3+}/Yb^{3+}$ (10.0/10.0 mol%) co-doped $NaGd(MoO_4)_2$ phosphor sample exhibited very strong shiny green emission. A possible UC mechanism for $Er^{3+}/Yb^{3+}$ co-doped $NaGd(MoO_4)_2$ depending on the pump power dependence was discussed.

본 연구에서는 간단 고상합성법(solid state reaction method)을 이용하여 $Yb^{3+}$, $Er^{3+}$ 이온이 동시도핑된 $NaGd(MoO4)_2$ ($NaGd(MoO_4)_2:Yb^{3+}/Er^{3+}$)를 성공적으로 합성하였으며, 결정구조 및 광학적 특성을 면밀히 분석하였다. 980nm의 근적외선 레이저를 합성된 NaGd(MoO4)2 파우더에 조사하였을 때 $NaGd(MoO_4)_2:Yb^{3+}/Er^{3+}$ 분말은 540 및 550 nm 부근에서 강한 녹색 발광과 함께 650 및 670 nm 부근에서의 매우약한 적색 발광을 하였으며 이러한 업컨버젼 발광 현상은 $Er^{3+}$ 이온 내의 infra 4f transition에 의한 현상임을 확인할 수 있었다. 또한, $Yb^{3+}$ 및 $Er^{3+}$ 이온의 최적 도핑 농도는 각각 (10.0/10.0 mol%)로 확인되었으며, 그에 따른 upconversion 발광 메커니즘에 대하여 상세히 논의하였다.

Keywords

References

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