Current Optics and Photonics

  • 제5권4호
  • /
  • Pages.450-457
  • /
  • 2021
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  • 2508-7266(pISSN)
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  • 2508-7274(eISSN)
한국광학회 (Optical Society of Korea)
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Microstructure Control and Upconversion Emission Improvement of Y2O3:Ho3+/Yb3+ Particles Prepared by Spray Pyrolysis

  • Bae, Chaehwan (Department of Chemical Engineering, Kongju National University) ;
  • Jung, Kyeong Youl (Department of Chemical Engineering, Kongju National University)
  • 투고 : 2021.04.13
  • 심사 : 2021.05.27
  • 발행 : 2021.08.25
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초록

Upconversion (UC) properties of Y2O3:Ho3+/Yb3+ 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:Ho3+/Yb3+ particles. In terms of achieving the highest UC green emission intensity, the optimal concentrations of Ho3+ and Yb3+ were found to be 0.3% and 3.0%, respectively. In addition, the UC intensity of Y2O3:Ho3+/Yb3+ showed a linear relationship with the crystallite size. The use of organic additives allows Y2O3:Ho3+/Yb3+ 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:Ho3+/Yb3+ 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:Ho3+/Yb3+ 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.

키워드

과제정보

This work was supported by the research grant of the Kongju National University in 2020 (grant number 2020-0235-01).

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