한국재료학회지 (Korean Journal of Materials Research)

  • 제30권8호
  • /
  • Pages.413-420
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  • 2020
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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Lu3Al5-xGaxO12:Ce3+,Cr3+ 형광체의 결정구조 분석 및 잔광성 발광 특성

Crystal Structure Refinement and Persistent Luminescence Properties of Lu3Al5-xGaxO12:Ce3+,Cr3+ Phosphors

  • 김지원 (경기대학교 신소재 공학과) ;
  • 김영진 (경기대학교 신소재 공학과)
  • Kim, Ji-Won (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Kim, Yeong-Jin (Department of Advanced Materials Engineering, Kyonggi University)
  • 투고 : 2020.07.01
  • 심사 : 2020.07.25
  • 발행 : 2020.08.27
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초록

Lu3Al5-xGaxO12:Ce3+,Cr3+ powders are prepared using a solid-state reaction method. To determine the crystal structure, Rietveld refinement is performed. The results indicate that Ga3+ ions preferentially occupied tetrahedral rather than octahedral sites. The lattice constant linearly increases, obeying Vegard's law, despite the strong preference of Ga3+ for the tetrahedral sites. Increasing x led to a blue-shift of the Ce3+ emission band in the green region and a change in the emission intensity. Persistent luminescence is observed from the powders prepared with x = 2-3, occurring through a trapping and detrapping process between Ce3+ and Cr3+ ions. The longest persistent luminescence is achieved for x = 2; its lifetime is at least 30 min. The findings are explained using crystal structure refinement, crystal field splitting, optical band gap, and electron trapping mechanism.

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