Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Luminescent Characteristics of Bi Co-doped ZnS:Mn Yellow Phosphors for White Light Emitting Diodes

Bi를 첨가한 백색 LED용 ZnS:Mn 황색형광체의 발광특성

  • Jung, Jong-Hun (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan) ;
  • Yu, Il (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan)
  • 정종훈 (동의대학교 물리학과, 부산 IT융합부품연구소) ;
  • 유일 (동의대학교 물리학과, 부산 IT융합부품연구소)
  • Received : 2010.10.20
  • Accepted : 2010.12.07
  • Published : 2011.01.27
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Abstract

Bi co-doped ZnS:Mn,Bi yellow phosphors for white light emitting diodes were prepared by the conventional solidstate reaction method. The optical and structural properties of ZnS:Mn,Bi phosphors were investigated by x-ray diffraction, scanning electro microscopy and photoluminescence. ZnS:Mn,Bi phosphors showed XRD patterns of hexagonal structure. The photoluminescence of ZnS:Mn,Bi phosphors showed spectra extending from 480 to 700 nm, peaking at 580 nm. The photoluminescence of 580 nm in the ZnS:Mn,Bi phosphors was associated with the 4T1 ${\rightarrow}$ 6A1 transition of the Mn2+ ions. The highest photoluminescent intensity of the phosphors under 405 nm and 450 nm excitation was obtained at Bi concentration of 7mol%. The optimum mixing conditions with epoxy and yellow phosphor for white light emitting diodes were observed in a ratio of epoxy:yellow phosphor of 1:3.5. The CIE chromaticity of the white LED at the 1:3.5 ratio was X = 0.3454 and Y = 0.2449.

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References

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