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標題: | 多功能稀土摻雜之螢光材料結構及光學特性 Structural and Luminescent Properties of Multi-functional Rare-earth Doped Phosphors |
作者: | Tzu-Chen Liu 劉子晨 |
指導教授: | 劉如熹 |
關鍵字: | 螢光粉,發光二極體,場發射顯示器,太陽能電池, Phosphor,Light-emitting Diode,Field Emission Display,Solar Cell, |
出版年 : | 2012 |
學位: | 博士 |
摘要: | 稀土離子摻雜之螢光粉根據不同激發源有許多應用。可調變能量之5d軌道及有許多能階之4f軌道可放射出不同波長光子。在本篇論文,激發源包括真空紫外光、紫外光、可見光及電子束。放射範圍包含從紫外光至可見光及近紅外光。
第三章研究主題為紅色氮氧化物之合成。稀土離子之內層4f → 4f躍遷被設計利用,因螢光粉體之5d → 4f躍遷已被決定。此螢光粉顯示高熱穩定性,為一白光發光二極體及電漿顯示器用之優良螢光粉選擇。而Pr3+離子亦為一可能之放射紅光稀土離子可能性。 第四章比較發光二極體及場發射顯示器用之螢光粉於電子束激發下之比較,結果顯示應發展新型螢光粉主體。由固態核磁共振之數據,我們提出一稀土離子添加入氮化鋁主體之不同解釋方法。一新穎氮化鋁摻雜Ce3+離子及矽被成功合成出來並證實可用於場發射顯示器應用中。 第五章包含應用於矽基板太陽能電池之兩種量子剪裁機制:(1)加入增感劑傳遞能量至4f → 4f躍遷,(2)利用寬帶激發離子例如Eu2+及Ce3+離子。因Ce3+離子需較高能量之光子,Eu2+/ Yb3+組合為較好之選擇。 The applications of phosphors according to different excitation sources are versatile due to the utilization of rare earth ions. The tunable energy levels of 5d orbital and the large number of energy levels of 4f orbitals can emit photons with different wavelength. In this thesis, excitation sources from vacuum ultraviolet (VUV), ultraviolet (UV) to visible photons, and electrons are investigated. Emission ranges from UV to visible range and near-infrared (NIR) are also utilized. The third chapter focuses on the synthesis of red-emitting oxynitride phosphor. Intraconfigurational 4f → 4f transitions are designed because of the determined environment for 5d → 4f transitions. The high thermal stability reveals that β–SiAlON is a good candidate for white light-emitting diodes (wLEDs) and plasma display panels (PDP). Pr3+ ions show the possibility of an alternative for red emitting activators. In the fourth chapter, comparison of LED- and FED-used phosphors under electron bombardment is made and it suggests a new class of host lattice should be developed. Evidences from solid-state nuclear magnetic resonance (ssNMR) lead to a different explanation of the incorporation of rare-earth ions into AlN host lattice. A new phosphor composition of AlN doped with Si4+ and Ce3+ ions is synthesized and shows the validity for field emission displays. The fifth chapter includes two proposed quantum cutting (QC) rare-earth combination for enhancing the efficiency of crystalline silicon (c-Si)-based solar cells: (1) adding a sensitizer to transfer the excited energy to the donor with 4f → 4f transitions , and (2) using a broad band donor such as Eu2+ and Ce3+ ions. It is concluded that due to the high energy of phonons required for Ce3+ ions, Eu2+-Yb3+ pairs is a better choice. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16389 |
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