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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.8
- 수록면
- 450 - 457 (8page)
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초록· 키워드
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Upconversion (UC) properties of Y₂O₃:Ho<SUP>3+</SUP><SUP></SUP>/Yb<SUP>3+</SUP> spherical particles synthesized by spray pyrolysis were investigated by changing the dopant concentration and calcination temperature. Citric acid (CA), ethylene glycol (EG) and N, N-dimethylformamide (DMF) were used to control the microstructure of Y₂O₃:Ho<SUP>3+</SUP><SUP></SUP>/Yb<SUP>3+</SUP> particles. In terms of achieving the highest UC green emission intensity, the optimal concentrations of Ho<SUP>3+</SUP> and Yb<SUP>3+</SUP> were found to be 0.3% and 3.0%, respectively. In addition, the UC intensity of Y₂O₃:Ho<SUP>3+</SUP><SUP></SUP>/Yb<SUP>3+</SUP> showed a linear relationship with the crystallite size. The use of organic additives allows Y₂O₃:Ho<SUP>3+</SUP><SUP></SUP>/Yb<SUP>3+</SUP> particles to have a spherical and dense structure, resulting in significantly reducing the surface area while maintaining high crystallinity. As a result, the UC emission intensity of Y₂O₃:Ho<SUP>3+</SUP><SUP></SUP>/Yb<SUP>3+</SUP> particles having a dense structure showed the UC emission intensity about 3.8 times higher than that of hollow particles prepared without organic additives. From those results, when Y₂O₃:Ho<SUP>3+</SUP><SUP></SUP>/Yb<SUP>3+</SUP> particles are prepared by the spray pyrolysis process, the use of the CA/EG/DMF mixtures as organic additives has been suggested as an effective way to substantially increase the UC emission intensity.
목차
Ⅰ. INTRODUCTION
Ⅱ. EXPERIMENTS
Ⅲ. RESULTS AND DISCUSSION
Ⅳ. CONCLUSIONS
REFERENCES
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