有機發光二極體(organic light emitting diodes, OLEDs),具輕、薄、短、小之特性,在顯示器上有著極大的應用優勢。微共振腔應用於OLED 元件上,可以利用現有的有機發光材料提升元件的發光強度與顏色純度,而不必受限於開發新的有機材料。目前已知的共振腔體,是用1/4 波長堆疊反射鏡(quarter wave stacks, QWS),針對單色光源而設計。如果要應用在紅、綠、藍光源上,則必須使用與其波長相對應之三種不同QWS 反射鏡,增加製作時的困難度。而為了能以單一的反射鏡之設計能同時應用於紅、綠、藍光源上,本論文模擬了高階反射鏡(Non-QWS),其反射相位變化,會在紅綠藍的波長下形成符合共振條件之腔體光學厚度,因此能以單一反射鏡同時應用於紅光、綠光、藍光上。本論文並探討了避免共振串音的條件。含有此高階反射鏡之微共振腔可以應用在全彩顯示器中,以更純、更亮的紅綠藍三色像素組合出各種顏色。
The organic light emitting diodes (OLEDs) can be applied to display technology, with the advantage of compact sizes. Usually, it requires the research and development of new organic materials to enhance the emission intensity and chromaticity accuracy. However, the application of microcavity to OLEDs can achieve the same goal with the existent organic materials. A typical microcavity consists of the quarter wave stacks (QWS) as one of the reflectors. The thickness of the QWS layers is specified for the particular wavelength to be resonant. Consequently, to enhance the red, green, and blue (RGB) OLEDs requires three different designs of the QWS and the microcavities. In order to have a single reflector design for all RGB OLEDs, we study and simulate the stack reflector of higher order. By means of the designed phase variation over the wavelength range, we obtain the suitable optical length of the microcavities, which is the function of the wavelength and can fulfill the resonant conditions at the three wavelengths of RGB by the same reflector design. Also, we investigate the cause and the solution of the cross-talk between the neighboring resonant peaks. The novel design of the reflector can be applied to the full color display of OLEDs, where each pixel of RGB can share the same reflector to reduce the fabrication processes. The new display design will have brighter intensity and more accurate chromaticity.