| 研究生: |
陳衡勳 Chen, Heng-Xun |
|---|---|
| 論文名稱: |
鹼土離子對於銪在硼矽酸鹽基質中自發還原現象及螢光性質之研究 Spontaneous reduction and fluorescence properties of europium ions in alkali-earth borosilicate |
| 指導教授: |
吳毓純
Wu, Yu-Chun |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
| 論文出版年: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 中文 |
| 論文頁數: | 82 |
| 中文關鍵詞: | 鹼土硼矽酸鹽 、銪離子 、自發還原 、螢光 |
| 外文關鍵詞: | alkaline earth borosilicate, Eu ions, spontaneous reduction, fluorescence |
| 相關次數: | 點閱:69 下載:1 |
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本研究第一部份為觀察硼鋁矽酸鹽基質中,B離子的添加比例對於Eu螢光性質的影響,由於Al離子的添加,確認能使Eu3+離子在非還原氣氛下部分還原成具有藍光發光特性的Eu2+。由27Al NMR實驗結果發現,B離子的添加量提高,以AlO6結構鍵結的Al離子比例逐漸降低,造成Eu3+自發還原量下降,是因為當network modifier的AlO6與Eu產生結構上的鍵結(Al-O-Eu)時,利於Eu的還原作用。
本研究第二部分為改用鹼土離子的添加,於空氣中煆燒處理後,觀察B的添加比例,在摻雜有固定比例的Ca、Sr之硼矽酸鹽基質中,Eu3+自發還原現象和螢光性質表現,並且討論與基質成份和結構之間的關連性。實驗結果發現,在固定Ca或Sr添加量時,Eu3+的自發還原量與基質中所含[BO4]比例有關。由於[BO4]可抑制氧化作用的發生,對Eu2+有屏蔽穩定的作用,因此Eu3+的自發還原比例會隨著[BO4]的比例也增加而提升。然而除了[BO4]的比例之外,Ca或Sr的加入,可以有效分散有高配位需求的Eu離子,降低其因自我凝聚所造成的濃度淬滅,同時Ca2+或Sr2+與Eu3+離子之間所發生的不等價取代效應,也在Eu3+的自發還原作用中扮演着極為重要的角色。一旦Ca被侷限在矽灰石結晶相中,即使基質中含有足夠的[BO4],也無法誘發Eu3+還原作用的發生。
另一方面,在含Sr的硼矽酸鹽基質中,Eu離子可能分別存在於非晶質結構、SrCl2及Sr2B5O9Clr結晶相中,透過不等價取代的方式還原成Eu2+。此時在含Sr2+的硼矽酸鹽系統中,Eu2+的還原比例,與系統中SrCl2、Sr2B5O9Cl結晶相含量及Eu3+取代Sr2+的量有關,而受到[BO4]比例影響較小。
本研究第三部分,討論於鍶硼矽酸鹽基質中,改變催化劑及煆燒溫度的製程條件,對於Eu離子螢光性質的影響。實驗結果推論 403 nm附近為鍶硼矽玻璃相中Eu2+所放出的藍光, 411 – 416 nm附近為Eu2+處於SrCl2不同結構下的所放出的螢光,而 430 nm為Eu在Sr2B5O9Cl所放出的螢光。我們發現到Eu存在於某些成分組成的非晶質結構中,會比存在於Sr2B5O9Cl及SrCl2結構中更利於自發還原。
並且發現到Cl離子的添加,有助於鍶硼矽基質中的Eu3+的自發還原,但是當樣品所提供負離子(Cl-)過多,會抵消 所形成的缺陷,使Eu3+還原量下降。
This work investigated the spontaneous reduction behavior of Eu3+ to Eu2+ in in boron-alumino-silicate matrix heat-treated in air atmosphere. In the aluminosilicate system, 27Al NMR results showed that the addition of B ions induced a decrease of Al in 6-fold coordination (AlO6) that as a consequence restrained the occurrence of spontaneous reduction. In the boronsilicate system, the coexistance of Ca2+ or Sr2+ ions is necessary for the application of spontaneous reduction behavior of Eu3+ to Eu2+. In correlation between 11B NMR and photoluminescence results, more Eu2+ can be reduced when there is more B in structure of 4-fold coordination (BO4) because it provides a shielding effect to the Eu2+ ions and inhibits the re-oxidation. The unequivalent substitution of Eu3+ for the occupation sites of Sr2+ or Ca2+ also plays an important role for the spontaneous reduction. When Ca2+ is confined in pseudowollastonite (CaSiO3) crystal that is probably due to the structural imcompatibility of Eu2+ in CaSiO3, therefore no spontaneous reduction of Eu3+ was occurred even when there are sufficient amount of BO4. On the other hand, spontaneous reduction can be taken place in SrCl2, Sr2B5O9Cl crystals but also amorphous phase and Eu2+ in these phases exhibits respective photoluminescent characteristics. In this work we confirmed that the amount of the B in 4-fold coordination is not the only reason but the unequivalent substitution occurred with a certain amount of Ca2+ or Sr2+ ions is indispensable to induce the spontaneous reduction of Eu3+ to Eu2+. In addition, the calcination temperature and the concentration of Cl- ions also give effects on the spontaneous reduction of Eu3+ for the Sr-borosilicate system. The thermal treatment at various temperatures induces a change of phase compositions and as a results the emission properties vary. According to the curve fitting results, the emission of Eu2+ is in centered of 403 nm, 411-416 nm and 430 nm for Sr-borosilicate glass, SrCl2 and Sr2B5O9Cl crystals, respectively. Moreover, the spontaneous reduction is favorably occurred when Eu3+ is located in the amorphous phase rather than that confined in Sr2B5O9Cl and SrCl2 crystallized phases. Finally, the coexistence of Cl- ion in Sr-borosilicate matrix is crucial for the reduction process because the substitution of Cl- at the oxygen position may enlarge the lattice structure that is beneficial for the occupation of Eu2+ ions.
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