內部奈米結構有機發光二極體研究

Abstract

有機發光二極體(Organic Light-Emitting Diode，OLED)具有重量輕、厚度薄、可彎曲性、色域廣、反應速度快等特性，因此被視為下一個世代重要的顯示器與照明元件，但由於 OLED 結構是由不同材料組成，當光線行經不同折射率層時，會因為全反射的原因，大角度的光線會被困在高折射率材料中形成波導模態，造成出光效率下降的問題。 一般常使用的解決方式，在折射率差異大的兩材料中製作微/奈米結構，本論文分析內部奈米結構有機發光二極體在不同波長色光場型的影響。除此之外，也透過有限差分時域法(Finite Difference Time Domain，FDTD)以電磁方式模擬 OLED 內部表面電漿子模態、基板模態、空氣模態能量分布，探討內部奈米結構對不同模態的影響。

Owing to its light weight, thin thickness, flexible feasibility, wide color gamut and fast response time, organic light-emitting diode(OLED) is considered as one of the most important display and lighting technique in the next generation. However, each layer is consist of different index material. When light pass through the different layers, large angle light will be easily trapped in the high index layer due to total internal reflection, inducing waveguide mode. As a result, out-coupling efficiency will decrease. The most common method to improve the out-coupling efficiency is using micro/nanostructure in the interface of different layer. In this thesis, we analyze the influence of out-coupling efficiency and far-field intensity by nanostructure OLED emission wavelength. Besides, we also use finite difference time domain method to simulate the surface plasmons mode, substrate mode and air mode. Discuss the energy distribution inside the nanostructure OLED.