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研究生: 尼科洛
Gabriel Nicolo A. De Guzman
論文名稱: 應用於發光二極體之超寬帶近紅外光螢光粉調控
Multi-Site Cation Control of Ultra-Broadband Near-Infrared Phosphors for Applications in Light Emitting Diodes
指導教授: 胡淑芬
Hu, Shu-Fen
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2020
畢業學年度: 108
語文別: 英文
論文頁數: 87
英文關鍵詞: Broadband Emission, Cation Control, Multi-Site Substitution
DOI URL: http://doi.org/10.6345/NTNU202000129
論文種類: 學術論文
相關次數: 點閱:183下載:0
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  • Near-infrared (NIR) phosphors are fascinating materials that have numerous applications in diverse fields. In this study, a series of La3Ga5GeO14:Cr3+ phosphors, which was incorporated with Sn4+, Ba2+, and Sc3+, was successfully synthesized using solid-state reaction to explore every cationic site comprehensively. The crystal structures were well resolved by combining synchrotron X-ray diffraction and neutron powder diffraction through joint Rietveld refinements. Trapping of free electrons induced by charge unbalances and lattice vacancies changes the magnetic properties, which was well explained by a Dyson curve in electron paramagnetic resonance. Temperature and pressure-dependent photoluminescence spectra reveal various luminescent properties between strong and weak fields in different dopant centers. The highest acquired quantum yield showed to be 23% which was enhanced by the Sc3+ doping. The phosphor-converted NIR light-emitting diode (pc-NIR LED) package demonstrates a superior broadband emission that covers the near-infrared (NIR) region of 650–1050 nm with a radiant power output reaching 23.8 mW at an injection current of 350 mA. This study can provide researchers with new insight into the control mechanism of multiple-cation-site phosphors and reveal a potential phosphor candidate for practical NIR LED application.

    Chapter 1. Introduction 1 1.1 Near-infrared spectroscopy 3 1.2 Phosphor materials 4 1.3 Phosphor-converted light-emitting diodes 6 1.4 Cr3+ as a luminescent center 8 1.4.1 Crystal field theory 9 1.4.2 Energy levels of free Cr3+ ions 11 1.4.3 Tanabe-Sugano diagram and Cr3+ emission principle 12 1.5 Selection of near-infrared phosphor 15 1.6 La3Ga5GeO14 system 17 1.7 Objectives and research motivation 18 Chapter 2. Experimental Approaches and Techniques 21 2.1 Starting precursors 22 2.2 Synthesis of Cr3+-doped La-gallogermanate phosphors 22 2.2.1 La3Ga4.95Ge1-xO14:0.05Cr,xSn4+ 23 2.2.2 La3(1-y)Ga4.95Ge0.9O14:0.05Cr,0.1Sn4+,yBa2+ 24 2.2.3 La2.97Ga4.95(1-z)Ge0.9O14:0.05Cr,0.1Sn4+,0.03Ba2+,zSc3+ 25 2.3 Characterization methods 26 2.3.1 X-ray diffraction 26 2.3.2 Rietveld refinements 29 2.3.3 Neutron powder diffraction 31 2.3.4 Electron paramagnetic resonance 32 2.3.5 Thermoluminescence 35 2.3.6 Photoluminescence 37 2.3.7 Quantum yield 38 2.3.8 Light-emitting diode packaging 39 Chapter 3. Results and Discussion 41 3.1 Structural characterizations 41 3.2 Photoluminescence measurements 63 3.3 Light-emitting diode packaging 77 Chapter 4. Conclusions 79 References 81

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