臺灣博碩士論文加值系統

本實驗主要在利用固態合成法製備摻雜Sm3+與Eu3+離子的Y2O3螢光材料及探討其光激發光的特性，並研究燒成溫度及燒成時間的改變對於粒徑大小、形狀與分散性之影響。稀土元素Sm和Eu之添加含量對於螢光體之光激發光特性之影響及其能量轉換機制也做一探討。適當的Sm3+和Eu3+離子之添加含量及最佳化的製程參數，將以相關檢測儀器加以比較探討。由x-ray繞射儀瞭解結構與相之生成，SEM監測粉末顆粒之大小形狀，利用PL光譜儀量測其激發光譜與發射光譜。此次的實驗結果顯示，提高燒成溫度並不會使晶粒有明顯的成長，但隨著燒成溫度的提高，發光強度卻有所提升。另外燒成時間的增加亦會使發光強度增強。隨著激活劑濃度的增加，發光強度也跟著變強，但在濃度過高時會發生濃度消光效應，反而造成發光強度下降。在1500℃、3小時的燒成條件下，螢光體有較佳的發光強度。Eu3+ 離子添加在Y2O3螢光體試樣，其莫耳比例為0.85Y2O3：0.15Eu3+時，有較強的發光強度，其發光波長為611nm和629nm(5D0à7F2)，而摻雜在Y2O3中的Sm3+離子，主要以(4G5/2--＞6H7/2)能階轉換，其主要波長為607nm和616nm，莫耳濃度比為0.99Y2O3：0.01Sm3+時，有較佳的發光強度。

Contents
Abstract(Chinese)……………………………………………………………….. I
Abstract(English)………………………………………………………………...II
Contents…………………………………………………………………………...III
Tables List…………………………………………………………………………V
Figures List……………………………………………………………………….VI
Chapter 1 Introduction…………………………………………………………1
1.1 The Application of Phosphors……………………………………………….3
1.2 The Classification of Phosphors……………………………………………..5
1.2.1 The Classification of Phosphors by The Different Composition…….5
1.2.2 The Classification of Phosphors by The Color Property…………….5
1.2.3 The Classification of Phosphors by The Property of Phosphors…….7
Chapter 2 Literatures Review………………….………...…………………….15
2.1 Luminescence Phenomena…………………………………………………15
2.2 Luminescence mechanism of Phosphors…………………………………..17
2.2.1 Energy Absorption and Emission of Phosphors……………………17
2.2.2 Properties Associated with Phosphors……………………………...20
2.2.3 Design of a Phosphor……………………………………………….20
2.3 The Intrinsic Properties of Y2O3 Phosphors……………………………….22
2.3.1 The Absorption and Emission of Y2O3:Eu3+ and Y2O3:Sm3+………22
2.3.2 The Selection Rules of Y2O3 Phosphors……………………………24
2.3.3 The Influence of the Host Lattice Y2O3…………………………….26
2.3.4 Crystal Structure of Y2O3:Eu3+ and Y2O3:Sm3+…………………….27
2.3.5 The Line Emissions of Rare Earth Ions(Eu3+, Sm3+ and Ce3+)……..28
2.4 Terms Relating to The Phosphor…………………………………………...30
2.4.1 Color and Wavelength………………………………………………30
2.4.2 The CIE Coordination………………………………………………31
Chapter 3 Experimental Procedures…………………………….…………49
3.1 Raw materials and Apparatus………………………………………………49
3.1.1 Raw materials……………………………………………………….49
3.1.2 Apparatus…………………………………………………………...49
3.2 Preparation of Phosphor powder………...………………………………….50
3.2.1 Mixing and Drying………………………………………………….50
3.2.2 Firing…………………………………………………………….…..50
3.3 Analysis of Phosphor Powder………………………………………….…...51
3.3.1 Thermal Analysis…………………………………………….……...51
3.3.2 Crystal Structure…………………………………………….………51
3.3.3 Morphology Evaluation………………………………………….…51
3.3.4 Particle Size Distribution…………………………………….……..51
3.3.5 Luminescence Property……………………………………….……52
Chapter 4 Results and Discussion…………………………………….……63
4.1 Approach in the Experiment………………………………………….……63
4.1.1 Feasibility Study…………………………………………………....63
4.1.2 Thermal Analysis…………………………………………….……..64
4.2 Photoluminescence Property of Y2O3 Phosphors…………………….……64
4.2.1 The Influence of Temperature on Luminescence Property………...64
4.2.2 The Influence of Time on Luminescence Property………………...67
4.2.3 The Influence of the Different Activator(Eu3+,Sm3+) on
Luminescence Property…………………...………..………………..69
4.3 Sintering of phosphor powders……………………………………….……75
4.3.1 X-ray Diffraction Analysis and Crystalline Structure……….……..75
4.3.2 Crystal Growth of Y2O3 Phosphors………………………….……..77
4.3.3 Particle Size Distribution………………………………….………..79
Chapter 5 conclusion………………………………………………….……...105
Reference…………………………………………………………….…….……..107

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