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研究生:黃莘閎
研究生(外文):Hsin-Hung Huang
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
論文名稱(外文):Thermal analyses and flexible substrate modification for improving lifetime of organic light-emitting diodes
指導教授:韋安琪
指導教授(外文):An-Chi Wei
學位類別:碩士
校院名稱:國立中央大學
系所名稱:光機電工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2019
畢業學年度:107
語文別:英文
論文頁數:68
中文關鍵詞:有機發光二極體軟性基板熱傳導散熱壽命
外文關鍵詞:organic light-emitting diodesflexible substratethermal conductivityheat dissipationlifetime
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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
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.
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
[1] 黃建盛,「人類照明之演進」,國立雲林科技大學,專題講座報告,2011
[2] C.W. Tang, and S.A. VanSlyke, “Organic lelctroluminescent diodes,” Appl. Phys., 51, pp. 912–915, 1987.
[3] Web page from Bushcraft shop. NL:
https://www.bushcraftshop.nl/uitrusting/verlichting
[4] Web page from Wikibooks:
https://en.wikibooks.org/wiki/Wikijunior:How_Things_Work/Light_Bulb
[5] Web page from Auraglow:
https://www.auraglow.co.uk/blog/how-to-add-some-vibrant-colour-to-your-home
[6] Web page from Novaled:
http://www.novaled.com/products/oled_lighting_materials/
[7] Web page from OSRAM:
https://www.osram-oled.com/features/micro_oled_features_main_1.jsp
[8] Rico Meerheim, Bjo ̈rn Lu ̈ssem, and Karl Leo, “Efficiency and stability of p-i-n type organic light emitting diodes for display and lighting applications,” Proceeding of the IEEE, 97, pp. 1606–1626, 2009.
[9] S.J. Su, H. Sasabe, T. Takeda, and J. Kido, “Pyridine-containing bipolar host materials for highly efficient blue phosphorescent OLEDs,” Chem. Mater, 20, pp. 1691–1693, 2008.
[10] S.I. Yoo, J.A. Yoon, N.H. Kim, J.S. Kang, C.B. Moon, and W.Y. Kim, “Improvement of efficiency roll-pff im blue phosphorescence OLED using double dopants emissive layer,” J. Lumin., 160, pp. 346-350, 2008.
[11] P. L. dos Santos, J.S. Ward, M.R. Bryce, and A.P. Monkman, “Using guest-host interactions to optimize the efficiency of TADF OLEDs,” J. Phys. Chem., 7, pp. 3341–3346, 2016.
[12] X. Cai, R. Liu, H. Shi, C Li, and H. Zhu, “High efficiency green phosphorescent OLEDs using double-host materials,” Dyes Pigm., 143, pp. 196–202, 2017.
[13] X. Zhang, F. You, Q. Zheng, Z. Zhang, P. Cai, X. Xue, J. Xiong, J. Zhang,“Solution-processed MOOX hole injection layer towards efficient organic light-emitting diode,” Org. Electron., 39, pp. 43–49, 2016.
[14] H.I. Beak, H.K. Lee, and C. Lee, “Enhancement of the OLED driving stability by introducing an LiFmixed α-NPD hole transport layer,” Sol. Proc. of SPIE, 6333, no. 1, pp. 63331B-1–63331B-8, 2006.
[15] S. Chung, J.H. Lee, J. Jeong, J.J. Kim, and Y. Hong,“Substrate thermal conductivity effect on heat dissipation and lifetime improvement of organic light-emitting diodes,” Appl. Phys., 94, pp. 253302-1–253302-3, 2009.
[16] M. Slawinski, D. Bertram, M. Heuken, H. Kalisch, and A. Vescan, “Electrothermal characterization of large-area organic light-emitting diodes employing finite-element simulation,” Org. Electron., 12, pp. 1399–1405, 2011.
[17] J.H. Kwon, H.G. Im, B.S. Bae, K.S. Chang, S.H. Ko Park, and K.C. Choi, “Heat transferable thin film encapsulation inserted Ag thin film to improve reliability of flexible displays.” SID, 47, pp. 1491–1494, 2009.
[18] J.S. Price and N.C. Giebink, “High thermal stability OLEDs.” SID, 48, pp. 565, 2017.
[19] D.W. Kim, H.Oh, B.D. Youn, and D. Kwon, “Bivariate lifetime model for organic light-emitting diodes,” IEEE Trans. Ind. Electron., 31, pp. 2325–2334, 2017.
[20] 黃詣中,有機發光二極體光熱電特性整合模擬之研究,國立中央大學光機電碩士班碩士論文,2017
[21] 黃瀚毅,有機發光二極體熱特性模擬研究,國立中央大學能源工程碩士班碩士論文,2016
[22] M.J. Moran, H.N. Shapiro, B.R. Munson, D.P. DeWitt, “Introduction to thermal system engineering: thermodynamics, fluid mechanics, and heat transfer,” John Wiley & Sons, pp. 31–58, 2003.
[23] 石延平譯,熱傳遞學,中央圖書,台北市,1985
[24] A.C. Wei, Y.J. Huang, B.L. Huang, and J.R. Sze, “Integration of optical and thermal models for organic light-emitting diodes,” Electronics, 8(1), 17, 2019.
[25] P. Schwamb, T.C.G. Reusch, C.J. Brabec, “Passive cooling of large-area organic light-emitting diodes,” Org. Electron., 14, pp. 1939-1945, 2013.
[26] K.J. Laidler, “The development of the Arrhenius equation,” J. Chem. Edu., 61, pp. 494–498., 1984.
[27] T.L. Chiu, H.J. Chen, Y.H. Hung, Y.H. Hsieh, and J.J. Huang, M.K. Leung “Structural optimizing carrier recombination for efficient blue phosphorescence organic light-emitting diode with ambipolar carbazole-triazole host,” IEEE. J. Sel. Top., 22, 2016.
[28] T.L. Chiu, H.J. Chen, Y.H. Hung, Y.H. Hsieh, and J.J. Huang, M.K. Leung “High-efficiency blue phosphorescence organic light-emitting diode with ambipolar carbazoleetriazole host,” J. Phys. Chem. C., 119, pp. 16846-16852, 2015.
[29] L. Yang, B. Wei, and J. Zhang, “Transient thermal characterization of organic light-emitting diodes,” Semicond. Sci. Technol., 27, pp. 1-6, 2012.
[30] G. Vamvounis, H. Aziz, N.X. Hu, and Z.D. Popovic, “Temperature dependence of operational stability of organic light-emitting diodes on mixed emitter layers,” Synthetic Metals, 143, pp. 69-79, 2004.
[31] T.L. Chiu, H.J. Chen, T.C. Lin, H.J. Gau, Y.H. Hsieh, J.J. Huang, L.K Yun, J.H. Lee, and M.K. Leung, “Colour stability of blue-green and white phosphorescent organic light-emitting diode employing a 9-(2-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)-9H-carbazole host,” Dyes and Pigments, 141, pp. 463–469, 2017.
[32] K. Furukawa, T. Tsujimura, S. Mano, and A. Ezaki, “Developmentt of world's first all-phosphorescent OLED product for lighting application,” ISSTL, conference paper, 2012.
[33] M. Aleksandrova, “Specifics and challenges to flexible organic light-emitting devices,” Adv. Mat. Sci. Eng., 4081697, pp. 1-8, 2016.
[34] S. Khan, L. Lorenzelli, R. Dahiya, “Technologies for printing sensors and electronics over large flexible substrates: a review,” IEEE Sens. J., 15, pp.3164–3185, 2014.
[35] Web page from Buykorea:
http://www.buykorea.orgproduct-detailsprecision-spin-coater-309281.html
[36] Web page from Actek:
https://www.actekinc.com.tw/product.php?upid=1046

[37] Web page from Konica Minolta:
https://sensing.konicaminolta.us/products/cs-1000a-s-t-spectroradiometer-
spectral-type/
[38] Web page from InfraTec:
https://www.infratec.eu/thermography/infrared-camera/
[39] Web page from TECPEL:
https://www.tecpel.com.tw
[40] H. Pang, L. Michalski, M.S. Weaver, R. Ma, and J.J. Brown, “Thermal
behavior and indirect life test of large-area OLED lighting panels,” J. Solid
State Lighting., 1, pp. 1-7, 2014.
[41] M. Ishii and Y. Taga, “Influence of temperature and drive current on
degradation mechanisms in organic light-emitting diodes,” Appl. Phys.,
Lett. 80(18), pp. 3430–3432, 2002.
[42] H. Aziz, Z. D. Popovic, and N.-X. Hu, “Organic light emitting devices
with enhanced operational stability at elevated temperatures,” Appl. Phys.,
Lett. 81(2), pp. 370–372, 2002.
[43] S. Chung et al., “Substrate thermal conductivity effect on heat dissipation
and lifetime improvement of organic light-emitting diodes,” Appl. Phys
Lett., 94, 253302, 2009
[44] T. D. Dobbertin et al., “OLED lighting solutions: achievements, trends and
prospects in technology,” SPIE Opt. + Photon. 8115-101 OLEDs and SSL
Plenary Session, 2011
[45] Web page from LG:
https://www.lg.com/tw/tvs/lg-OLED77C9PWA
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