공업화학 (Applied Chemistry for Engineering)

  • 제26권3호
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  • Pages.319-325
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  • 2015
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  • 1225-0112(pISSN)
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  • 2288-4505(eISSN)
한국공업화학회 (The Korean Society of Industrial and Engineering Chemistry)
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분무열분해법으로 CeO2:Er/Yb 형광체 제조 및 발광특성 최적화

Preparation and Luminescence Optimization of CeO2:Er/Yb Phosphor Prepared by Spray Pyrolysis

  • 정경열 (공주대학교 화학공학부) ;
  • 박재훈 (공주대학교 화학공학부) ;
  • 송신애 (한국생산기술연구원 마이크로제조시스템기술센터)
  • Jung, Kyeong Youl (Department of Chemical Engineering, Kongju National University) ;
  • Park, Jea Hoon (Department of Chemical Engineering, Kongju National University) ;
  • Song, Shin Ae (Energy Materials Research Center, Korea Research Institute of Chemical Technology)
  • 투고 : 2015.03.06
  • 심사 : 2015.04.10
  • 발행 : 2015.06.10
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초록

분무열분해법을 이용하여 서브 미크론 크기의 $CeO_2:Er^{3+}/Yb^{3+}$ 상향 변환 형광체 입자를 합성하고 $Er^{3+}$ 및 $Yb^{3+}$ 농도 변화에 따른 발광특성을 조사하였다. 합성한 $CeO_2:Er^{3+}/Yb^{3+}$는 $Er^{3+}$ 활성이온의 $^4S_{3/2}/^2H_{11/2}{\rightarrow}^4I_{15/2}$ 및 $^4F_{9/2}{\rightarrow}^4I_{15/2}$ 전이에 기인한 강한 녹색 및 적색 발광을 보였다. 가장 높은 발광을 보이는 활성제 농도는 Er = 1.0% 그리고 Yb = 2.0%이며, 농도소광 현상은 쌍극자-쌍극자 상호작용을 통해 일어남이 확인되었다. 레이저 다이오드 여기 광 세기에 대한 발광강도 의존성을 활성이온 농도에 따라 조사하였고, 발광 중간 에너지 레벨의 주 소멸과정을 고려하여 발광 메커니즘을 조사하였다. $Yb^{3+}$에서 $Er^{3+}$으로 에너지 전달은 바닥 상태 흡수(ground state absorption, GSA)에 기여하고, $Yb^{3+}$ 도핑은 $^4I_{11/2}{\rightarrow}^4I_{13/2}$ 전이를 가속화시켜 적색/녹색 발광세기 비를 상승시킨다. 최종적으로 분무열분해법으로 제조된 $CeO_2:Er^{3+}/Yb^{3+}$ 형광체의 발광은 선형 감쇠가 중간 에너지 레벨의 고갈을 지배하는 2 광자 프로세스에 의해 일어남을 확인하였다.

Submicron-sized $CeO_2:Er^{3+}/Yb^{3+}$ upconversion phosphor particles were synthesized by spray pyrolysis, and their luminescent properties were characterized by changing the concentration of $Er^{3+}$ and $Yb^{3+}$. $CeO_2:Er^{3+}/Yb^{3+}$ showed an intense green and red emission due to the $^4S_{3/2}$ or $^2H_{11/2}{\rightarrow}^4I_{15/2}$ and $^4F_{9/2}{\rightarrow}^4I_{15/2}$ transition of $Er^{3+}$ ions, respectively. In terms of the emission intensity, the optimal concentrations of Er and Yb were 1.0 % and 2.0%, respectively, and the concentration quenching was found to occur via the dipole-dipole interaction. Upconversion mechanism was discussed by using the dependency of emission intensities on pumping powers and considering the dominant depletion processes of intermediate energy levels for the red and green emission with changing the $Er^{3+}$ concentration. An energy transfer from $Yb^{3+}$ to $Er^{3+}$ in $CeO_2$ host was mainly involved in ground-state absorption (GSA), and non-radiative relaxation from $^4I_{11/2}$ to $^4I_{13/2}$ of $Er^{3+}$ was accelerated by the $Yb^{3+}$ co-doping. As a result, the $Yb^{3+}$ co-doping led to greatly enhance the upconversion intensity with increasing ratios of the red to green emission. Finally, it is revealed that the upconversion emission is achieved by two photon processes in which the linear decay dominates the depletion of intermediate energy levels for green and red emissions for $CeO_2:Er^{3+}/Yb^{3+}$ phosphor.

키워드

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피인용 문헌

  1. Up-conversion luminescence of Er(Yb)-CeO2: Status and new results vol.711, pp.None, 2017, https://doi.org/10.1016/j.jallcom.2017.04.043