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The Influence of Processing Parameters on Photoluminescent Properties of Ba2ZnS3:Mn Phosphors by Double-Crucible Method

Published online by Cambridge University Press:  15 March 2011

Yu-Feng Lin
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701 Taiwan, ROC
Yen-Hwei Chang
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701 Taiwan, ROC
Bin-Siang Tsai
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701 Taiwan, ROC
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Red light emitting of Mn2+ doped Ba2ZnS3 phosphor powders have been synthesized by double-crucible method at different thermal treatments. XRD results indicate that the raw materials are completely sulfurized above 950°C, and the Ba2ZnS3: Mn2+ powders don't change its orthorhombic crystal structure with increasing doping concentration from 0 to 0.8 mol%. The photoluminescence of Ba2ZnS3: Mn2+ powders fulfilled the most efficient emission at the excitation wavelength λex=358 nm and showed the red emission light with peak wavelength λem=627nm at the doping concentration of Mn2+ ion between 0.2 and 0.8 mol%. The high-luminance red emission results from the 4T1 (4G)—6A1 (6S) transition in the Mn2+ ion. Ba2ZnS3: Mn2+ phosphors synthesized by double-crucible method have broad emission spectra (550nm∼750nm) with FWHM (full width at half maximum broadband) about 66nm. In our research, the Ba2ZnS3 doped with 0.4 mol% Mn2+ has the highest luminescent intensity as thermal treatment at 950°C for 16 hours and the CIE coordinate is x=0.66, y=0.33.

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Copyright © Materials Research Society 2004

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