臺灣博碩士論文加值系統

由於利用小分子有機材料或高分子材料所製造的有機發光元件相當適合於平面顯示器的應用，所以近年來受到廣泛的研究。針對高分子材料而言，其優點為可經由溶液旋轉塗佈的方式來製作大面積的薄膜。但是，我們卻無法利用傳統的黃光微影製程將多色的高分子材料整合在一起來製作全彩的顯示器。為了解決這項困難，印刷技術最近被研究來達成製作全彩顯示器的目的。
在這本論文中，我們利用有限摻雜源之染料擴散熱轉印法(Finite-source dye-diffusion thermal transfer，FS-D2T2) 對已形成之高分子薄膜進行局部的摻雜。在進行FS-D2T2時，將被轉印膜與轉印源薄膜直接緊密接觸，透過加熱擴散的方式，使染料轉印至被轉印膜。我們分別在PVK或PVK: PBD的系統中進行了一連串的染料擴散實驗，而且證明可利用Fick’s擴散理論來模擬染料的擴散行為。並且利用FS-D2T2對有機發光元件進行發光顏色的調制，並製作出多彩的有機發光元件。

Organic light emitting devices (OLEDs) based on molecular organic materials or polymer materials have been extensively studied because of their various merits suitable for flat panel display applications. The capability of solution processing of polymers leads to manufacturing advantage for large-area coating. However, it is found difficult to integrate multicolor polymer materials or devices for full-color displays by conventional coating and sequential photolithography steps. To resolve this issue, printing approaches have been aggressively pursued recently.
In this thesis, we propose finite-source dye-diffusion thermal transfer (FS-D2T2) for performing controllable doping of polymer films in OLEDs. In this process, the polymer receiver film is placed in direct contact with the dye-dispersed polymer donor film to permit direct dye-diffusion thermal transfer. We perform a series of experiments of dye diffusion in the poly(N-vinylcarbazole) (PVK) or the poly (N-vinylcarbazole): 2-(4—biphenyl)-5-(4-tert- butylphenyl)-1,3,4-oxadiazole (PVK: PBD) matrix systems and show that it can be modeled by Fick’s diffusion theory. Using this doping process, we demonstrated color tuning & color integration of OLEDs.

Chapter 1: Introduction
1.1 OLED overview
1.2 Color Integration Issues
1.3 Thesis Organization
Chapter 2: Effect of Emissive Doping into an Emissive Polymer
2.1 Introduction
2.2 Material Preparation
2.3 Optical Properties of Blend Thin Films
2.4 Summary
Chapter 3: Finite-Source Dye Diffusion Thermal Transfer
3.1 Introduction
3.2 Experiment Setup
3.3 Theoretical Simulation
3.4 Experiment Results and Discussions
3.4.1 Diffusion in PVK Film
3.4.2 Diffusion in PVK: PBD Blend Film
3.5 Summary
Chapter 4: OLEDs Using Doped Polymers
4.1 Introduction
4.2 Device Fabrication & Characterization
4.3 Effect of Hole-Injection Layer
4.4 Effect of Conventional Blend Doping vs. FS-D2T2 Doping
4.5 Application of FS-D2T2 Process in Color Integration
4.6 Summary
Chapter 5: Conclusion
References
Appendix A: Differential scanning calorimetry (DSC)

[1] W. Helfrich and W.G. Schneider, Phys. Rev. Lett. 14, 229 (1965)
[2] C.W. Tang and S.A. Vanslyke, Appl. Phys. Lett. 51, 913 (1987)
[3] C.W. Tang, S.A. Vanslyke and C.H. Chen, J. Appl. Phys. 65,3610 (1989)
[4] J.H. Burroughes, D.D.C. Bradley, A.R. Brown, R.N. Marks, K. MacKay, R.H. Friend, P.L. Burn, and A.B. Holmes, Nature 347, 539 (1990)
[5] D. Braun and A.J. Heeger, Appl. Phys. Lett. 58,1982 (1991)
[6] G. Gustafsson, Y. Cao, G.M. Treacy, F. Klavetter and A.J. Heeger, Nature 357, 477 (1992)
[7] E. Westerweele, P. Smith and A.J. Heeger, Adv. Mater. 7, 788 (1995)
[8] G. Yu, K. Pakbaz and A.J. Heeger, J. Electron. Materials 23, 925 (1994)