MAl2O4（M：Sr、Ba、Mg）螢光材料發光特性研究

The Study of Photoluminescence on MAl2O4 （M：Sr、Ba、Mg）Phosphors System

吳孟桓(Meng-Huan Wu)

指導教授 ： 唐自標

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2006年)

摘要

本實驗以固態反應法製備MAl2O4（M：Sr、Ba、Mg）：Eu螢光粉，探討摻雜Eu的濃度對於製程條件相同的鹼土族鋁酸鹽會有何光學特性與晶格結構之影響，經還原燒成之Eu2+呈現出4f65d1 → 4f7躍遷之連續寬廣帶狀譜，且Eu在不同母體中，會呈現出不同顏色、強度與特性之放射光譜。實驗以X光繞射儀（XRD）鑑定結晶相；以螢光光譜儀（Fluorescence Spectrophotometer）檢測螢光體之光激發特性；以掃描式電子顯微鏡（SEM）觀察表面型態。由實驗結果得知SrAl2O4：Eu，當Eu摻雜量為0.4mole％時，有最佳發光強度，吸收波鋒為375nm，放射波鋒為515nm（綠色光）寬幅放射光譜；BaAl2O4：Eu，當Eu摻雜量為0.3mole％時，有最佳發光強度，吸收波鋒為370nm，放射波峰為490nm（藍綠色光）的寬幅放射光譜；MgAl2O4：Eu，，當Eu摻雜量為0.2mole％時，有最佳發光強度，吸收波鋒360nm，放射波峰為470nm（藍色光）的寬幅放射光譜，且發光強度比為SrAl2O4：Eu＞BaAl2O4：Eu＞MgAl2O4：Eu，此乃因母體離子的大小影響Eu的固溶率下降，也使得發光波長往短波長方向偏移。由SEM分析，發現當摻雜一樣濃度Eu的螢光體做元素成分分佈（Mapping）時，SrAl2O4：Eu表面發現的Eu為最多，而MgAl2O4：Eu為最少，發現此結果與發光強度相互呼應。

關鍵字

SrAl2O4 ； BaAl2O4 ； MgAl2O4 ； Eu ； 螢光材料

並列摘要

The study used the solid state reaction to prepare the MAl2O4（M：Sr、Ba、Mg）：Eu phosphor changed the concentration of Eu to probe the influence of luminescence and lattice structure. The 4f65d1 → 4f7 spectrum of Eu fire in reduced atmosphere is continuous and broad. It will demonstrate different colors, intensity and characteristic of emission spectrum, when it in different host lattices. We use the X-ray Diffract meter to analyze the lattice crystal structure, the fluorescence spectrometer to analyze the phosphorescence characteristics, and the scanning electron microscope to observe the surface structure .The experimental result show the SrAl2O4：Eu, when Eu doping concentration is 0.4mole％，there is the best luminous intensity, have the excitation peak at 375nm，and the emission peak at 515nm. BaAl2O4：Eu, when Eu doping concentration is 0.3mole％，there is the best luminous intensity, have the excitation peak at 370nm，and the emission peak at 490nm. MgAl2O4：Eu , when Eu doping concentration is 0.2mole％，there is the best luminous intensity, have the excitation peak at 360nm，and the emission peak at 470nm. The luminous intensity than SrAl2O4：Eu＞BaAl2O4：Eu＞MgAl2O4：Eu，because the size of the host ion influences the solid solution rate reduce of Eu. And make the luminous peak shift of the shortwave too. By SEM mapping, the SrAl2O4：Eu surface be fined most Eu ,and the MgAl2O4：Eu surface is fewest. The result responds to the luminous intensity.

並列關鍵字

SrAl2O4 ； BaAl2O4 ； MgAl2O4 ； Eu ； photoluminescence

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