臺灣博碩士論文加值系統

本研究主要探討鈣鈦礦結構變化與其摻雜之銪原子螢光性質的關係，本實驗由溶液凝膠法合成銪摻雜之Ca(Ti,Zr)O3奈米晶體鍛燒溫度控制於800°C，我們使用X光繞射來確認晶體結構與粒徑大小，由X光繞射數據顯示粒徑大小與樣品中Zr/Ti 濃度比例相關，由延伸X光吸收精密結構我們得知Zr與Ti原子位於相似的環境，而由Eu L3-edge 可得知當CaTiO3加入一定比例Zr時會降低Eu原子周圍環境的對稱性，在光致發光光譜中我們發現螢光訊號強度的確在降低對稱性的狀態下有小幅的增加。

In this thesis, we discuss the relationship between the changes of perovskite structure of europium-doped Ca(Ti,Zr)O3 and its fluorescence properties. Europium-doped Ca(Ti,Zr)O3 were prepared by a sol-gel method and annealed at 800°C in O2. The structure and particle size were investigated by X-ray powder diffraction (XRD). The XRD results show that the particle size is dependent on the Ti/Zr ratio. The extended x-ray absorption fine structure results show that Zr and Ti are in similar chemical environments. The Eu L3-edge EXAFS result exhibits reduced symmetry when Zr dopant atoms are present in the CaTiO3 host structure. Photoluminescence measurements show that the fluorescence intensity increases with the asymmetry of local environment surrounding Eu3+.

摘要 i
Abstract ii
致謝 iii
章節目錄 iv
圖表目錄 vi
第一章 序論............................................1
1-1 研究動機........................................1
1-2 論文簡介........................................1
第二章 理論與文獻回顧...................................2
2-1　鈣鈦礦結構介紹......................................2
2-2　鈦酸鈣材料介紹......................................3
2-3　鋯酸鈣材料介紹......................................3
2-4　螢光材料簡介與發光機制...............................4
第三章 實驗原理及方法...................................5
3-1　X光繞射（X-ray diffraction;XRD）....................5
3-2　拉曼光譜（Raman spectroscopy）......................6
3-3　X光吸收精密結構
（X-ray absorption fine structure;XAFS）............7
3-4　光致發光光譜（Photoluminescence;PL）................13
第四章 樣品製備實驗流程.................................14
4-1　溶液凝膠法（sol-gel method）........................14
4-2　實驗藥劑...........................................14
4-3　製備流程...........................................15
4-4　樣品代號...........................................17
第五章 實驗數據結果與分析討論...........................18
5-1　 X光繞射分析(XRD) .................................18
5-2　拉曼光譜分析（Raman spectroscopy）..................21
5-3　 X光吸收精密結構分析(XAFS) .........................23
　　5-3-1　近邊X光吸收精密結構分析(XANES) ................23
　　5-3-2　延伸X光吸收精密結構分析(EXAFS) ................24
5-4　光致發光光譜分析(PL) ...............................31
第六章 討論與結論......................................34
參考文獻................................................35

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