OLED發光原理是由於電子、電洞在發光層內再結合形成激子，激子從激發態回到基態時會發光，而激子的生成與電子、電洞的注入濃度以及有機材料的電荷遷移率有關。為探討有機層中的激子數，本論文利用空間電荷限制電流法，依據有機材料實際情況，來計算有機材料的電荷遷移率，接著考慮主發光體與客發光體之間的能量轉移的關係，及考慮電極淬熄對激子的影響，再結合所推算之電荷遷移率，建立模擬模型，以模擬出激子在有機層內的分布情況。 將模擬出的激子濃度分布曲線，以電流密度修正，並積分激子濃度分布曲線，以計算出有機層內的激子數，而可得知電流密度與激子數之間的關係，最後，利用實際OLED元件做輝度測量，並藉由模擬與實驗的結果之比較，探討激子數與輝度之間的關係，以建立預測OLED元件效能的電特性模擬模型。 ;The principle of OLED light-emission lies in the recombination of electrons and holes, resulting in the generation of excitons in the organic layers. The excitons emit light when they return to the ground state from the excited state. Since the generation of excitons relates to the concentrations of injected electron and hole, mobility of material, etc, this study explored the mobility by the method of space charge limited current (SCLC) according to the actual material conditions. Then, the energy transfer between the host and the guest materials and the electrode quenching effect on excitons were considered along with the measured mobility for calculating the exciton density distribution within the organic layers. Afterward, the exciton density distribution curve was correct by the measured current density. With the integral of exciton density distribution curve, the number of excitons within the organic layers was calculated, and the relationship between the current density and the number of excitons were derived. Finally, luminance of OLED elements was measured to explore the relationship between the number of excitons and the luminance and to set up an electronic simulation model for predicting the performance of OLED devices.
