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

The Korea Association of Crystal Growth (한국결정성장학회)
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Analysis of upconversion luminescence from Yb3+, Er3+ co-doped SrMoO4

Yb3+와 Er3+ 이온이 동시 도핑 된 SrMoO4에서 발생되는 업컨버젼 현상에 대한 분석

  • Chung, Jun Ho (Department of Materials Science and Engineering, Hanyang University) ;
  • Heo, Tae Hyung (Department of Materials Science and Engineering, Hanyang University) ;
  • Lee, Jeong Hoon (Department of Materials Science and Engineering, Hanyang University) ;
  • Lee, Sang Yeop (Department of Materials Science and Engineering, Hanyang University) ;
  • Kang, Suk Hyun (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, So Yeon (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, Sae Am (Department of Materials Science and Engineering, Hanyang University) ;
  • Choi, Bong Geun (Department of Materials Science and Engineering, Hanyang University) ;
  • Shim, Kwang Bo (Department of Materials Science and Engineering, Hanyang University)
  • 정준호 (한양대학교 신소재공학과) ;
  • 허태형 (한양대학교 신소재공학과) ;
  • 이정훈 (한양대학교 신소재공학과) ;
  • 이상엽 (한양대학교 신소재공학과) ;
  • 강석현 (한양대학교 신소재공학과) ;
  • 김소연 (한양대학교 신소재공학과) ;
  • 김새암 (한양대학교 신소재공학과) ;
  • 최봉근 (한양대학교 신소재공학과) ;
  • 심광보 (한양대학교 신소재공학과)
  • Received : 2012.09.12
  • Accepted : 2012.10.05
  • Published : 2012.10.31
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Abstract

$Yb^{3+}$, $Er^{3+}$ co-doped $SrMoO_4$ ($SrMoO_4$ : $Yb^{3+}/Er^{3+}$) specimens have been successfully synthesized via the complex citrate-gel method and their structural and optical properties were investigated in detail. Under 980 nm excitation, $SrMoO_4$ : $Yb^{3+}/Er^{3+}$ UC phosphors have been emitted strong green luminescence at 530 and 550 nm with weak red emission around 670 nm corresponding to the intra 4f transitions of $Er^{3+}$ ($^4F_{9/2}$, $^2H_{11/2}$, $^4S_{3/2}$) ${\rightarrow}$ $Er^{3+}$ ($^4I_{15/2}$). The optimal doping concentrations of $Er^{3+}$ and $Yb^{3+}$ ions were verified to 2/16 mol% and a possible upconversion mechanism depending on pump power dependence is studied in detail.

본 연구에서는 complex citrate-gel method를 이용하여 $Yb3^{3+}$, $Er^{3+}$ 이온이 동시 도핑 된 $SrMoO_4$($SrMoO_4$: $Yb^{3+}/Er^{3+}$)를 성공적으로 합성하였으며, 그 구조적, 광학적 특성을 분석하였다. 980 nm의 근적외선 여기 광 하에서 상기 분말은 530 및 550 nm 부근의 강한 녹색 방출과 670 nm 부근에서의 약한 적색 방출은 $Er^{3+}$ 이온 내의 intra 4f transition $Er^{3+}$($^4F_{9/2}$, $^2H_{11/2}$, $^4S_{3/2}$) ${\rightarrow}$ $Er^{3+}(^4I_{15/2})$에 의한 현상임을 확인하였다. 또한, $Er^{3+}$ 및 $Yb^{3+}$ 이온의 최적 도핑 농도는 각각 2/16 mol%로 조사되었으며 그에 따른 형성 가능한 upconversion 메커니즘에 대하여 논의하였다.

Keywords

References

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