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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.6
- 수록면
- 248 - 255 (8page)
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초록· 키워드
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Spherical CeO₂:Ho<SUP>3+</SUP>/Yb<SUP>3+</SUP> particles were synthesized using spray pyrolysis, and the upconversion (UC) properties were investigated with changing the preparation conditions and the infrared pumping power. The resulting particles had a size of about 1 μm and hollow structure. The prepared CeO₂:Ho<SUP>3+</SUP>/Yb<SUP>3+</SUP>particles exhibited intense green emission due to the <SUP>5</SUP>F₄/<SUP>5</SUP>S₂→<SUP>5</SUP>I<SUB>8</SUB> transition of Ho<SUP>3+</SUP> and showed weak red or near-IR peaks. In terms of achieving the highest UC emission, the optimal concentrations of Ho<SUP>3+</SUP> and Yb<SUP>3+</SUP> were 0.3% and 2.0%, respectively. The UC emission intensity of prepared CeO₂:Ho<SUP>3+</SUP>/Yb<SUP>3+</SUP> particles had a linear relationship with crystallite size and concentration quenching was caused by dipole-dipole interaction between the same ions. Based on the dependency of UC emission on the pumping power, the observed green upconversion was achieved through a typical two-photon process and concluded that the main energy transfer from Yb<SUP>3+</SUP> to Ho<SUP>3+</SUP> was involved in the ground-state adsorption (GSA) process.
목차
I. INTRODUCTION
II. EXPERIMENTAL
III. RESULTS AND DISCUSSION
IV. CONCLUSION
REFERENCES
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