Luminescence characteristics of bismuth and europium co-doped yttrium oxide red phosphor for white light emitting diodes

Bi와 Eu이 도핑된 yttrium oxide의 white LED용 적색 형광체 발광 특성

  • Park, W.J. (Department of Advanced Materials Engineering, Sungkyunkwan University) ;
  • Jung, M.K. (Department of Advanced Materials Engineering, Sungkyunkwan University) ;
  • Yoon, S.G. (Department of Advanced Materials Engineering, Sungkyunkwan University) ;
  • Yoon, D.H. (Department of Advanced Materials Engineering, Sungkyunkwan University, Department of Advanced Materials Engineering & Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University)
  • 박우정 (성균관대학교 신소재공학과) ;
  • 정몽권 (성균관대학교 신소재공학과) ;
  • 윤석규 (성균관대학교 신소재공학과) ;
  • 윤대호 (성균관대학교 신소재공학과, 성균 나노과학 기술원)
  • Published : 2006.06.30

Abstract

The red emission properties of $Bi^{3+}$ co-doped $Y_2O_3:Eu^{3+}$ prepared by the solid-state reaction was investigated, in order to verify its potential to act as the red emitting phosphor of white LEDs. The emission spectrum consisted of a weak band at 581, 587, 5931 and 599 nm, with maximum sharp peaks occurring at about 611 nm due to the $^5D_0{\rightarrow}^7F_2$ transition of $Eu^{3+}$, while the excitation spectrum exhibited a broad band between 290 and 430 mm with peaks occurring in the range of $310{\sim}390nm$. Also, SEM image of the sample containing 0.43 mol% $H_3BO_3$ and 2.08 mol% $BaCl_2{\cdot}2H_2O$ phosphor particles grew to achieve diameters of $700{\sim}800nm$.

본 연구에서는 장파장 UV 영역하에서 비교적 우수한 발광강도를 가지는 적색 형광체를 얻기 위하여 고상법으로 합성하여 발광특성을 관찰하였다. 발광 피크는 581, 587, 593nm의 약한 발광 peak과 611 nm의 최대 peak을 관찰 할 수 있는데 이들 중 581, 587, 593nm의 peak들은 $^5D_0{\rightarrow}^7F_1$로의 전자천이에 기인하는 발광 peak들이며, 611 nm의 최대 발광 peak과 630nm의 약한 peak은 $^5D_0{\rightarrow}^7F_2$로의 전자 천이에 기인하는 발광 peak들이다. 또한 합성된 적색 형광체는 $310{\sim}390nm$의 broad한 흡수피크를 나타낸다. 또한 융제를 0.43mo1% $H_3BO_3$와 2.08mo1% $BaCl_2{\cdot}2H_2O$를 첨가한 입자 크기는 $700{\sim}800nm$로 매우 균일하게 성장되었다.

Keywords

References

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