呂宗昕2006-07-252018-06-282006-07-252018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/9417本研究成功利用微乳膠製程合成 高性能之奈米級銪離子添加之釔鋁柘 榴石Y3Al5O12 (YAG)螢光粉。在微乳膠 系統內，研究水油比對於YAG ：Eu 3+ 結構與螢光特性的影響。不同的水油比下，對於YAG ：Eu 3+的反應途徑為 相同，但顯微結構卻有巨幅的變化。 當水相在微乳膠系統減少時，粉體的 型態會呈現圓形均勻分佈且粒徑會減 少。螢光強度也會隨水相的含量減少 有增加的趨勢。從EXAFS 的結果顯 示：當水油比下降時，Eu 3+ 的周遭環境 扭曲的現象與Eu 3+ 和O 2- 的鍵長都會降 低。此結果使得非輻射傳遞機率下降 並且縮短能量由主體晶格到激活劑的 距離。本研究在水相較低的微乳膠環 境下，可以合成球狀且分散均勻的高螢光強度YAG ：Eu 3+螢光粉。The microemulsion process was successfully developed for synthesizing europium-ion doped yttrium aluminum garnet (YAG: Eu 3+ ) nanoparticles. The effect of water to oil ratio in the microemulsion system on structural and luminescent properties of YAG:Eu 3+ was investigated. The reaction routes of YAG: Eu 3+ in different W/O systems remained the same, while the morphologies of those changed significantly. The particle size became reduced and spherical particle presented at low content of water phase. The emission intensity also enhanced with a decrease in the content of water phase. The EXAFS results indicated that the disordered level around Eu 3+ ions and the bond distance of Eu-O reduced both decreased as decreasing W/O ratio. These resulted in the reduction of non-radiative probability and the shortening of the energy transfer route from host lattice to activators, Eu 3+ . YAG: Eu 3+ with notable luminescence and well-dispersed sphere-like nanoparticles was successfully prepared via low content of water phase.application/pdf253884 bytesapplication/pdfzh-TW國立臺灣大學化學工程學系暨研究所微乳膠法釔鋁柘榴石奈米粉體螢光材料reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/9417/1/932214E002019.pdf