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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 劉如熹(Ru-Shi Liu) | |
dc.contributor.author | Yi-Ting Tsai | en |
dc.contributor.author | 蔡宜庭 | zh_TW |
dc.date.accessioned | 2021-06-15T13:02:44Z | - |
dc.date.available | 2016-08-03 | |
dc.date.copyright | 2016-08-03 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-07-08 | |
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Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes. Nat. Comm. 2014, 5, 4312. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/50859 | - |
dc.description.abstract | 早期所發展之白光發光二極體以藍光晶片激發黃色螢光粉所結合出白光,對應太陽光譜時,由於缺少紅色波段放光,對於暖白光需求較為困難,故近年研究發展以紅色螢光粉為主要導向。本論文利用化學取代與基礎合成條件對當今較熱門之紅色氮化物螢光粉進行改質,同時研究其化學特性與理論探討。Sr2Si5N8:Eu2+ 紅色螢光粉具620奈米放光,為理想之橘紅光源,以基本合成條件做為改良方式,維持其放光波段不受化學取代改變,並同時於合成時間調控中發現Sr2Si5N8:Eu2+ 與 SrSi6N8:Eu2+ 之間相轉變過程,以成功合成出同時具藍光與紅光放光之複合性螢光粉材料。CaAlSiN3:Eu2+亦為高穩定材料之一,其放光波段位於650 奈米,於此嘗試利用Sr取代Ca之化學取代方式將波段藍移至理想之620奈米,透過同步輻射之晶格與價態分析,搭配固態核磁共振與拉曼光譜觀察此體系中結構重組並形成有序結構之轉換過程。Sr[LiAl3N4]:Eu2+具較窄帶放光光譜,減少人眼較不敏感之紅外光區放光,產生純度更高之紅光。我們嘗試利用表面修飾減少此螢光粉之耐水性問題,藉由二氧化矽修飾成功提升耐水性與空氣中之穩定性,並提高其放光效能,亦為首次利用高壓合成法合成出該紅色螢光粉材料,在高濕高溫條件之下證明其表面修飾有助於提高穩定性,進一步以理論計算與電子結構模型推斷出活化中心價態轉變之現象,提出具泛用性之理論基礎架構。 | zh_TW |
dc.description.abstract | Traditional WLEDs are fabricated using blue chip and yellow phosphor to produce white light, with high efficiency but poor color rendering index (CRI) because of the lack of a red component. In this work, using chemical substitution and synthesis conditions on the basis red nitride phosphors, while theoretical discussion of their chemical properties. The light emission of Sr2Si5N8:Eu2+ at 620 nm, the orange light is ideal to red source. The properties of Sr2Si5N8:Eu2+ can be tailored by tuning the pressure, temperature, and sintering time in the basic sintering process. In the synthesis of Sr2Si5N8:Eu2+, Sr2Si5N8:Eu2+ was converted into SrSi6N8:Eu2+ during heating. CaAlSiN3: Eu2+ is also one of the highly stable material, which is located 650 nm. (Sr,Ca)AlSiN3:Eu2+, was developed through cation substitution and blue shift to 620 nm of peak position. Distortion of the lattice structure introduced adequate space and highly coordinated sites in the Sr/Eu centers for charge variation effect. Subsequently, typically arranged variations of the SiN¬4 and AlN4 clusters were formed in the lattice by Raman and ssNMR technique. SrLiAl3N4:Eu2+ presents a narrow band red phosphor for reducing near infrared region emission. In this study, SrLiAl3N4:Eu2+ red phosphor was prepared through a high-pressure solid-state reaction and was coated with organosilica layers to improve water resistance. The coated samples exhibited excellent moisture resistance while retaining external quantum efficiency in high temperature and high humidity. This study provides valuable information on the stimulation of nitride phosphors in LEDs | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T13:02:44Z (GMT). No. of bitstreams: 1 ntu-105-D01223121-1.pdf: 9428628 bytes, checksum: b2b273b583cd3489cec4cde6426a54dd (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | 口試委員審定書 I
誌謝 II 摘要 III Abstract IV Contents V Figures Caption IX Tables Caption XX Chapter 1. Introduction 1 1.1 Light 1 1.1.1 History of LED 2 1.1.2 Human vision and color perception 4 1.1.3 Market of LED. 9 1.1.4 Fundamental of LED 13 1.1.5 Classification of white LEDs 14 1.2 Inorganic Phosphor Materials 19 1.2.1 Host lattice 20 1.2.2 Activator 21 1.2.3 Jablonski diagram 21 1.2.4 Electronic configurations and selection rule of rare-earth ions 23 1.2.5 Nephelauxetic effect 26 1.2.6 Crystal field splitting 27 1.2.7 Thermal quenching behaviour 29 1.2.8 Nitride phosphor. 30 1.2.9 Narrow-band phosphor with a cuboid structure 32 1.3 Objectives and Research Motivation 43 References 47 Chapter 2. Experimental Techniques 52 2.1 List of Materials 53 2.2 High Pressure Sintering Process for Nitride Phosphor 55 2.3 Characterization Techniques 57 2.3.1 Luminescent measurements 57 2.3.1.1 Photoluminescence 57 2.3.1.2 Temperature-dependent photoluminescence 60 2.3.1.3 Pressure-dependent photoluminescence by diamond anvil cell 61 2.3.1.4 X-ray absorption spectroscopy (XAS) 62 2.3.2 Structural measurements 67 2.3.2.1 X-ray diffraction 67 2.3.2.2 Raman spectrum 71 2.3.2.3 Scanning electron microscopy 73 2.3.2.4 Solid-state nuclear magnetic resonance (ssNMR) 75 References 76 Chapter 3. Formation of Sr2Si5N8:Eu2+ and Its Transformation to SrSi6N8:Eu2+ Controlled by Temperature and Gas Pressure 78 3.1 Introduction 78 3.2 Experimental Section 80 3.2.1 Sample preparation: 80 3.2.2 Instrumentation and sample analysis: 80 3.3 Results and Discussion 81 3.3.1 Temperature effect on Sr1.98Si5N8:Eu2+0.02 formation 81 3.3.2 Gas pressure effect on Sr1.98Si5N8:Eu2+0.02 formation 89 3.3.3 Phase transition from Sr1.98Si5N8:Eu2+0.02 to SrSi6N8:Eu2+ 91 3.4 Summary 100 References 101 Chapter 4. Structural Ordering and Charge Variation Induced by Cation Substitution in (Sr,Ca)AlSiN3:Eu Phosphor 105 4.1 Introduction 105 4.2 Experimental Section 106 4.2.1 Sample preparation: 106 4.3 Results and Discussion 107 4.4 Summary 121 Reference 121 Chapter 5. Improving Waterproof Properties via Organosilica Coating on High Isostatic Pressure Synthesized Narrow-band Red-emitting SrLiAl3N4:Eu2+ Phosphor 124 5.1 Introduction 124 5.2 Experimental Section 127 5.3 Results and Discussion 129 5.4 Summary 152 Reference 153 Chapter 6. Concluding Remarks 155 6.1 Conclusions 155 Scientific Journal Publication List 157 Patent 159 Contribution to Scientific Meetings 161 Honors 162 | |
dc.language.iso | en | |
dc.title | 應用於發光二極體之紅色氮化物螢光粉合成與配方調控 | zh_TW |
dc.title | Synthesis and Composition Control of Red Nitride Phosphors for Applications in Light-emitting Diodes | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 葉耀宗(Yao-Tsung Yeh),廖秋峰,周必泰,陳登銘,許火順 | |
dc.subject.keyword | 紅色螢光粉,LED,固態反應, | zh_TW |
dc.subject.keyword | red phosphor,LED,solid state, | en |
dc.relation.page | 162 | |
dc.identifier.doi | 10.6342/NTU201600468 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-07-10 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 化學研究所 | zh_TW |
顯示於系所單位: | 化學系 |
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