銪摻雜鈣鈦礦結構Ca(Ti,Zr)O3奈米晶體之螢光研究

Studies of photoluminescent properties in Eu-doped Ca(Ti,Zr)O3 provskite nanocrystals

陳建豪(Jian-Hao Chen)

指導教授 ： 蘇雲良

國立清華大學/理學院/物理學系/碩士(2017年)

摘要

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。

關鍵字

光致發光 ； 奈米晶體 ； 銪 ； 鈣鈦礦 ； 鈦酸鈣 ； 鋯酸鈣

並列摘要

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+.

並列關鍵字

Photoluminescence ； Nanocrystals ； Europium ； Perovskite ； Calcium titanate ； Calcium zirconate

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