| Summary: | 碩士 === 國立虎尾科技大學 === 材料科學與綠色能源工程研究所 === 102 === In this study, ZnAl2O4:Mn phosphors were synthesized by the sol-gel method. The effects of structural modification of host , hydrolysis and doping activator on the structure, microstructure and luminescence were investigated.
Manganese-doped ZnAl2O4 phosphor started to crystallize into ZnAl2O4 phase after heating at 300oC and homogeneous ZnAl2O4 were obtained after heating at 1200oC and the structure was normal spinel. In addition, differerce hydrolysis processes could affect the grain size of the phosphor. The addition of urea which could decrease the size of grain and particle and increase uniform distribution of activator during hydrolysis process.The host structure could be modified by co-doping with Mg2+ and Mn2+, which lead to reduce in the grain size.
The emission peak of ZnAl2O4:Mn phosphor was at 510 nm, mainly come from 4T1 →6A1 energy level transition of Mn2+ ion. In addition, absorption, luminance ,decay time and CIE coordinate were dependent on Mn concentration, urea content and heat treatment condition. A red shift of emission band was observed on the co-doped phosphor.
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