探討共振波長對微共振腔型有機發光元件光學特性的影響

Abstract

本論文致力於發展微共振腔型有機發光元件的結構和製程以及探討此元件的光電特性• 利用嚴謹的古典電磁學模型，我們將發光體放在兩鏡面反節點的位子，分析光學微共振腔有機發光二極體的發光特性跟共振波長的關係•從全盤的分析中，我們發現發光特性和微共振腔共振波長有強烈的相依關係•如果共振波長被設置在比發光體的光致發光峰值大的情況，微共振腔型有機發光元件的電致發光頻譜會隨著視角的變化展現很大的藍偏移，同時元件也會也比較大的外部量子效率•如果共振波長被設置在接近發光體的光致發光峰值的附近，元件會有最大的正向流明效率•最後，如果共振波長被設置在小於發光體的光致發光峰值的情況，微共振腔型有機發光元件的電致發光頻譜展現很小的色偏移，隨著視角的變化甚至難以偵測• 我們也做了一系列的元件來驗證光學模擬的結果•實驗結果證實了我們計算的結果也證實了光學模擬的有效性•

This thesis is devoted to developing device structures and processing of microcavity organic light-emitting devices, and investigated the electro-optical characteristics of such devices. We have analyzed the emission characteristics of microcavity OLEDs as a function of the microcavity resonant wavelengths with placing emitters around the antinode of the two mirrors using the rigorous classical electromagnetic model. From the comprehensive analyses, we find out the emission characteristics are strongly dependent on the microcavity resonant wavelengths. If the resonant wavelength is set larger than the peak wavelength of the intrinsic emission (PL) spectrum of the emitter, EL spectra of the microcavity OLED will exhibit a large blue shift with the variation of viewing angles and the device will give the higher external quantum efficiency. If the resonant wavelength is set near the peak wavelength of the intrinsic spectrum of the emitter, the device will give the highest forward luminescence efficiency. Finally, if the resonant wavelength is set smaller than the peak wavelength of the intrinsic spectrum of the emitter, EL spectra of the microcavity OLEDs will exhibit very small color shift, even hardly to detect with the variation of viewing angles. We have also made a series of devices to corroborate the results of optical modeling. Experimental results confirm our calculated results and confirm the effectiveness of the optical modeling.