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http://dx.doi.org/10.3740/MRSK.2011.21.1.046

Luminescent Characteristics of Bi Co-doped ZnS:Mn Yellow Phosphors for White Light Emitting Diodes  

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)
Publication Information
Korean Journal of Materials Research / v.21, no.1, 2011 , pp. 46-49 More about this Journal
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.
Keywords
ZnS; Luminescence; Mn; Bi; LED;
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