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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 呂宗昕 | zh_TW |
| dc.contributor.author | 葉俊宏 | zh_TW |
| dc.contributor.author | Chun-Hung Yeh | en |
| dc.date.accessioned | 2021-07-10T21:50:40Z | - |
| dc.date.available | 2024-08-12 | - |
| dc.date.copyright | 2019-08-26 | - |
| dc.date.issued | 2019 | - |
| dc.date.submitted | 2002-01-01 | - |
| dc.identifier.citation | 參考文獻
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77202 | - |
| dc.description.abstract | 本論文第一部份首先討論CeO2球形內核之合成步驟，並且提出合成機制圖，將所合成之CeO2球進行熱重分析，以分析氧化鈰中殘留之有機物；以SEM分析其表面形貌以及CeO2粒徑大小，並且以TEM分析其晶體結構。後續使用沉澱法並利用沉澱劑在高溫會釋放氫氧根的特性，將不同濃度之Eu3+均勻包覆在球形氧化鈰表面上，後續進行高溫煆燒處理使Eu3+成功摻雜於CeO2主體晶格中。後續使用XRD分析CeO2:Eu3+之晶體結構，可得知摻雜Eu3+離子會使氧化鈰晶格膨脹和過量之Eu3+會出現Eu2O3相存在；使用SEM分析CeO2:Eu3+核殼結構之表面形貌，過量之Eu3+會在氧化鈰球形表面外單獨形成突起之形貌；使用掛載於TEM上之能量色散X-射線光譜分析，可以得知CeO2內核為一均勻球形，而Eu3+均勻分布於球形CeO2上；後續利用螢光光譜儀量測CeO2:Eu3+之光譜特性，此類螢光粉可以UV、藍光和綠光激發，放光波長位於橘紅光波段，並根據量測之結果討論CeO2晶體結構對發光特性之影響。
本論文第二部份先嘗試找出最適化之增感劑濃度，並量測其激發光譜與放射光譜，CeO2:Tb3+可以使用藍光激發，其放光波段位於黃綠光區間，所找出最適化之增感劑濃度為1 mol% Tb3+。後續使用XRD分析CeO2:Tb3+, Yb3+之晶體結構，可以得知以水熱法所合成之量子剪裁螢光粉屬於純相氧化鈰結構且沒有觀察到其他雜項出現。以SEM分析CeO2:Tb3+, Yb3+表面形貌以及觀察其粉體粒徑大小。使用365 nm之UV光源激發並以紅外光區間之偵測器量測放射光譜，可以得出Yb3+可有效地將UV波段之高能量光子轉換成位於低能量紅外光區之光子，並在976 nm可以觀察到Yb3+放射之波峰。 | zh_TW |
| dc.description.abstract | The first part in this thesis discussed the synthesis of CeO2 materials in a spherical form, and the corresponding synthesis mechanism was proposed in details. CeO2 spheres were then utilized to synthesize Eu3+ ions coated CeO2 phosphors via the precipitation technique. XRD analysis of the crystal structure of CeO2: Eu3+ shows that the doping of Eu3+ ions caused the lattice expansion and the Eu2O3 phase existed at high concentration of Eu3+. The surface morphology of the CeO2: Eu3+ core-shell structure was analyzed by SEM. The emission peaks were located in the orange-red wavelength band, CeO2: Eu3+ had intense emission due to the 5D0→7F1 (orange) or 5D0→7F2 (red) transition of Eu3+. The R/O emission ratio showed a linear increment with the Eu3+ concentration. The suitability of the present phosphors in warm white light-emitting diode was finally depicted in the chapter.
In the second part, Tb3+ and Yb3+ ions co-activated CeO2 phosphors in octahedral shape were developed for quantum cutting applications to promote the photovoltaic efficiency. Firstly, the optimum concentration of sensitizer ions was estimated by varying the concentration of Tb3+ ions in CeO2: Tb3+ host. Then, Yb3+ ions are co-doped in the optimized host and the XRD analysis of the crystal structure of CeO2: Tb3+, Yb3+ indicated that the presence of pure phase. The near-infrared emission of CeO2: Tb3+, Yb3+ phosphors were observed using a 365 nm UV source. The present research concluded that Yb3+ could effectively convert high-energy photons in the UV band to the low-energy infrared region. | en |
| dc.description.provenance | Made available in DSpace on 2021-07-10T21:50:40Z (GMT). No. of bitstreams: 1 ntu-108-R06524089-1.pdf: 3560895 bytes, checksum: e681c1910f0c81a0d5e684048d66c453 (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | 目錄
口試委員會審定書 # 誌謝 i 摘要 ii Abstract iii 目錄 iv 圖目錄 viii 表目錄 xi 第 1 章 螢光粉基本原理與合成方法介紹 1 1.1 研究背景 2 1.2 發光材料基本介紹 2 1.3 光的物理特性 3 1.3.1 CIE色度座標圖(CIE chromaticity diagram) 4 1.3.2 色溫(Color temperature) 5 1.3.3 演色性(Color rendering index) 5 1.3.4 量子效率(Quantum efficiency) 5 1.4 螢光材料之轉換方式 6 1.5 無機固態螢光材料之基本原理與現象 7 1.5.1 螢光特性 7 1.5.2 發光機制 7 1.5.3 法蘭克-康登定理(Franck-Condon principle) 8 1.5.4 史托克位移(Stokes shift) 8 1.6 無機固態螢光材料之組成 9 1.6.1 主體晶格(Host lattice) 9 1.6.2 活化劑(Activator) 9 1.6.3 增感劑(Sensitizer) 11 1.6.4 共活化劑(Co-activator) 11 1.7 螢光材料合成方法介紹 11 1.7.1 固相反應法(Solid-state reaction method) 12 1.7.2 共沉澱法(Co-precipitation method) 12 1.7.3 溶膠-凝膠法(Sol-gel method) 12 1.7.4 噴霧熱裂解法(Spray pyrolysis) 13 1.7.5 微乳液法(Microemulsion method) 13 1.7.6 水熱法(Hydrothermal method) 13 1.8 二氧化鈰材料介紹 14 1.9 研究動機與目的 14 第 2 章 實驗方法與特性分析 29 2.1 CeO2:Eu3+核殼結構螢光粉製備 29 2.1.1 水熱法製備CeO2球形內核 29 2.1.2 沉澱法製備Eu3+外殼層 30 2.2 水熱法製備CeO2:Yb3+, Tb3+量子剪裁螢光粉 30 2.3 儀器分析 31 2.3.1 X光繞射儀(X-ray diffractometer, XRD) 31 2.3.2 螢光光譜儀(Photoluminescence spectrometer, PL) 31 2.3.3 場發射掃描式電子顯微鏡(Field emission scanning electron microscope, FESEM) 31 2.3.4 場發射穿透式電子顯微鏡(Field emission transmission electron microscope, FETEM) 32 2.3.5 熱重分析儀(Thermogravimetric analysis, TGA) 32 第 3 章 CeO2:Eu3+核殼結構螢光粉之合成與光學特性分析 37 3.1 CeO2核球製備 37 3.2 CeO2:Eu3+核殼結構螢光粉之合成 38 3.3 CeO2:Eu3+晶體結構分析 39 3.4 CeO2:Eu3+之表面形貌與元素分布分析 41 3.5 CeO2:Eu3+光譜特性與發光機制 42 第 4 章 CeO2:Tb3+, Yb3+光學特性與量子剪裁效應 56 4.1 CeO2:Tb3+光學特性分析 56 4.2 CeO2: Tb3+, Yb3+量子剪裁螢光粉之合成 56 4.3 CeO2: Tb3+, Yb3+量子剪裁螢光粉晶體結構分析 57 4.4 CeO2: Tb3+, Yb3+量子剪裁螢光粉之表面形貌分析 57 4.5 CeO2: Tb3+, Yb3+量子剪裁螢光粉之光學特性 58 4.6 CeO2: Tb3+, Yb3+量子剪裁螢光粉之機制探討 58 第 5 章 結論 68 5.1 CeO2:Eu3+核殼結構螢光粉之合成與光學特性分析 68 5.2 CeO2:Tb3+, Yb3+光學特性與量子剪裁效應 69 參考文獻 70 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 光譜特性 | zh_TW |
| dc.subject | 量子剪裁 | zh_TW |
| dc.subject | 核殼結構 | zh_TW |
| dc.subject | 螢光粉 | zh_TW |
| dc.subject | 氧化鈰 | zh_TW |
| dc.subject | 沉澱法 | zh_TW |
| dc.subject | 水熱法 | zh_TW |
| dc.subject | Spectral characteristic | en |
| dc.subject | Precipitation method | en |
| dc.subject | Cerium oxide | en |
| dc.subject | Phosphor | en |
| dc.subject | Core-shell Structure | en |
| dc.subject | Quantum-cutting | en |
| dc.subject | Hydrothermal method | en |
| dc.title | 發光二極體及量子剪裁應用之氧化鈰螢光粉製備與發光特性 | zh_TW |
| dc.title | Synthesis and Luminescence Characterization of Ceria Base Phosphors for Light Emitting Diodes and Quantum Cutting Application | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 107-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 李育群;邱德威 | zh_TW |
| dc.contributor.oralexamcommittee | ;; | en |
| dc.subject.keyword | 水熱法,沉澱法,氧化鈰,螢光粉,核殼結構,量子剪裁,光譜特性, | zh_TW |
| dc.subject.keyword | Hydrothermal method,Precipitation method,Cerium oxide,Phosphor,Core-shell Structure,Quantum-cutting,Spectral characteristic, | en |
| dc.relation.page | 73 | - |
| dc.identifier.doi | 10.6342/NTU201903807 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2019-08-16 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 化學工程學系 | - |
| 顯示於系所單位： | 化學工程學系 | |
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