有機發光二極體之軟性基板散熱設計及壽命改善之研究

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姓名

黃莘閎(Hsin-Hung Huang) 查詢紙本館藏

畢業系所

光機電工程研究所

論文名稱

有機發光二極體之軟性基板散熱設計及壽命改善之研究
(Thermal analyses and flexible substrate modification for improving lifetime of organic light-emitting diodes)

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摘要(中)

可撓式有機發光二極體(Flexible organic light-emitting diodes, FOLED) 是具潛力的顯示器以及照明元件，然而，其因壽命表現不佳而未能全面市場化。本研究提出一改善之軟性基板，供予可撓式有機發光二極體使用，以提升其散熱能力，進而延長元件之壽命。本研究藉由模擬分析、元件量測、光學原理以及熱學原理，成功推估並驗證該改善之軟性基板的散熱提升效益，其延長一般可撓式有機發光二極體之壽命為1.67倍。再參照市面上實際的顯示器產品之尺寸，模擬大尺寸模型之熱分布，進一步推估該改善之軟性基板應用於現今大型顯示器之可行性。本研究之成果將作為未來大型FOLED壽命提升的實作之參考

摘要(英)

In this study, we propose a methodology to enhance the lifetime of flexible organic light-emitting diodes (FOLEDs). By means of improving the thermal conduction on the substrate, we can increase the efficiency of thermal dissipation of the FOLED and optimize its lifetime. Using self-developed model in simulation software, COMSOL, and Arrhenius equation, we estimated the lifetime firstly. Next, we measured luminance and thermal distribution of a small-area white FOLED via a luminometer and a thermographic camera. After the comparisons between simulation and measured results, we corrected the constructed model. Furthermore, we predicted the lifetime of large-area OLED lighting panels. This proposed substrate is expected to extend the lifetime and to improve OLEDs’ performance obviously.

關鍵字(中)

★ 有機發光二極體
★ 軟性基板
★ 熱傳導
★ 散熱
★ 壽命

關鍵字(英)

★ organic light-emitting diodes
★ flexible substrate
★ thermal conductivity
★ heat dissipation
★ lifetime

論文目次

1 Table of Contents
摘要 I
Abstract II
Acknowledgements III
List of Figures VI
List of tables VIII
CHAPTER 1 INTRODUCTION 1
1.1 Research background 1
1.2 Developments of flexible organic light-emitting diodes 3
1.3 Research objectives 7
1.4 Significance of research 7
1.5 Organization of research 8
2 CHAPTER 2 THEORIES AND PRINCIPLES 9
2.1 Emission theory 9
2.2 Theory of heat 10
2.3 Thermal conductivity theory 11
2.4 Equations about lifetime 12
2.4.1 Acceleration factor formula 12
2.4.2 Ggeneral rate law 12
2.4.3 Arrhenius equation 12
3 CHAPTER 3 DESIGN CONSIDERATIONS AND SIMULATION 14
3.1 Design considerations 14
3.1.1 Optical consideration 14
3.1.2 Thermal considerations 18
3.2 Thermal simulation 16
3.3 Analyses and Discussions of thermal distribution 22
4 CHAPTER 4 FABRICATION AND EXPERIMENT 25
4.1 Fabrication of flexible white organic light-emitting diodes with proposed substrate 25
4.1.1 General information 25
4.1.2 Design of proposed substrate and encapsulation cover 26
4.2 EL performance 28
4.3 Lifetime performance with luminance depreciation 29
4.3.1 Life testing method 29
4.3.2 Results and discussion 31
4.4 Lifetime performance with thermal distribution 32
4.4.1 Lifetime testing method 34
4.4.2 Results and discussions 36
5 CHAPTER 5 ERROR ANALYSES AND CORRECTIONS OF SIMULATION 39
5.1 Introduction of two kinds of errors 39
5.1.1 Errors in temperatures 39
5.2 Corrections in simulation and corrected results 41
5.2.1 Parameter optimization 42
5.2.2 Errors in corrected temperatures 44
5.2.3 Errors in corrected lifetime ratio 45
5.2.4 Result and discussion 46
5.3 Large size of FOLED with proposed substrate in simulation 47
6 CHAPTER 6 CONCLUSIONS AND PROPSECTS 50
6.1 Conclusions 50
6.2 Prospects 50
7 References 52

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指導教授

韋安琪(An-Chi Wei)

審核日期

2019-8-21

推文