백색 LED의 특성에 대한 ZnS:Mn, Dy 황색 형광체의 영향 (Effect of ZnS:Mn, Dy Yellow Phosphor on White LEDs Characteristics)

서지정보

· 발행기관 : 한국재료학회
· 수록지 정보 : 한국재료학회지 / 21권 / 6호 / 295 ~ 298페이지
· 저자명 : 신덕진, 유일

초록

ZnS:Mn, Dy yellow phosphors for White Light Emitting Diode were synthesized by a solid state reaction method using ZnS, MnSO_4·5H2O, S and DyC_l3·6H_2O powders as starting materials. The mixed powder was sintered at 1000℃ for 4h in an air atmosphere. The photoluminescence of the ZnS:Mn, Dy phosphors showed spectra extending from 480 to 700 nm, peaking at 580 nm. The photoluminescence of 580 nm in the ZnS:Mn, Dy phosphors was associated with ^4T_1→^6A_1 transition of Mn^(2+) ions. The highest photoluminescence intensity of the ZnS:Mn, Dy phosphors under 450 nm excitation was observed at 4 mol% Dy doping. The enhanced photoluminescence intensity of the ZnS:Mn, Dy phosphors was explained by energy transfer from Dy^(3+) to Mn^(2+). The CIE coordinate of the 4 mol% Dy doped ZnS:Mn, Dy was X = 0.5221, Y = 0.4763. The optimum mixing conditions for White Light Emitting Diode was obtained at the ratio of epoxy : yellow phosphor = 1:2 form CIE coordinate.

영어초록

ZnS:Mn, Dy yellow phosphors for White Light Emitting Diode were synthesized by a solid state reaction method using ZnS, MnSO_4·5H2O, S and DyC_l3·6H_2O powders as starting materials. The mixed powder was sintered at 1000℃ for 4h in an air atmosphere. The photoluminescence of the ZnS:Mn, Dy phosphors showed spectra extending from 480 to 700 nm, peaking at 580 nm. The photoluminescence of 580 nm in the ZnS:Mn, Dy phosphors was associated with ^4T_1→^6A_1 transition of Mn^(2+) ions. The highest photoluminescence intensity of the ZnS:Mn, Dy phosphors under 450 nm excitation was observed at 4 mol% Dy doping. The enhanced photoluminescence intensity of the ZnS:Mn, Dy phosphors was explained by energy transfer from Dy^(3+) to Mn^(2+). The CIE coordinate of the 4 mol% Dy doped ZnS:Mn, Dy was X = 0.5221, Y = 0.4763. The optimum mixing conditions for White Light Emitting Diode was obtained at the ratio of epoxy : yellow phosphor = 1:2 form CIE coordinate.

참고자료

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