材料消光係數對有機發光元件高階共振薄膜效能之影響

有機發光二極體顯示器(OLEDs) 具備自發光特性、敏捷的反應速度、寬廣的可視範圍、低的耗電量、清晰的對比、面板厚度薄、重量輕並具備可撓曲等優勢，適用於各種環境，並具有高競爭力。有機發光材料擁有寬的發光頻譜，可以藉由外加的光學結構來純化色彩。如本文所探討的薄膜微共振腔體結構，類似採用在半導體雷射元件裡發展成熟的微共振腔(microcavity) 裝置。我們將此微共振腔結構建立在有機發光元件中電極與玻璃基板之間。一般我們所知道的微共振腔由一對反射鏡與腔體組成；其中一個反射鏡是陰極金屬，另一個反射鏡是薄膜堆疊鏡，是由高/低折射率的兩種介電質薄膜層組成，以四分之一波長光學厚度相互堆疊形成介電質鏡稱為quarter wave stack (QWS)。本研究採用QWS 並且安插更高倍數光學厚度的介電質層來改變共振腔的共振特性，稱為高階共振薄膜。並考慮一般研究忽略的腔體有機材料的消光係數(extinction coefficient) 對介電質鏡反射相位所產生的影響，模擬共振後光強度頻譜的改變。利用不同的膜層堆疊組合，進而設計出合適的腔體結構，而獲得理想的色彩輸出。

關鍵字

有機發光二極體；微共振腔；色度座標；介電質鏡；四分之一波長堆疊；非全四分之一波長堆疊

並列摘要

Organic light-emitting diodes (OLEDs) offer many advantageous properties, such as self-luminousness, quick response time, wider viewing angle, low operating voltage, high contrast, thinner panel thickness, light weight, and flexibility of panel. These advantages could be applied to a variety of environments and be highly competitive, compared with other display technologies. Organic materials have wide spectrum of luminescence, but can be narrowed through extra optical structure, as explored in this thesis as the thin-film microcavity. It is similar to that used in semiconductor laser devices. A typical microcavity structure consists of the dielectric quarter wave stacks (QWS) as a distributed Bragg reflector (DBR) and the metal cathode to form a pair of mirrors. The organic and other material layers between the mirrors plays the role of the cavity. Our previous study proposed the use of non-QWS mirror using thicker and higher-order (greater integral multiple of the quarter wavelength) of the dielectric layers. We had the multiple resonance peak wavelengths by introducing the reflection phase change of the dielectric stack mirror at certain wavelengths. In this study, we include the extinction coefficient, the dispersion of the materials, the use of the transfer matrix, and the dipole emission properties within the cavity into our simulation principles.

並列關鍵字

OLED microcavity ； dielectric stack mirror ； CIE coordinate ； QWS ； non-QWS

參考文獻

[1] C. W. Tang, S. A. VanSlyke, and C. H. Chen, “Electroluminescence of doped organic thin films,” J. Appl. Phys., vol. 65, pp. 3610–3616, 1989.

[2] Y. Q. Li, J. X. Tang, Z. Y. Xie, L. S. Hung, and S. S. Lau, “An efficient organic light-emitting diode with silver electrodes,” Chem. Phys. Lett., vol. 386, pp. 128–131, 2004.

[3] D. Y. Kondakov, J. R. Sandifer, C. W. Tang, and R. H. Young, “Nonradiative recombination centers and electrical aging of organic light-emitting diodes: Direct connection between accumulation of trapped charge and luminance loss,”

J. Appl. Phys., vol. 93, pp. 1108–1119, 2003.

[4] L. S. Hung and C. H. Chen, “Recent progress of molecular organic electroluminescent materials and devices,” Mater. Sci. Engi., vol. R39, pp. 143–222, 2002.

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材料消光係數對有機發光元件高階共振薄膜效能之影響

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