以散射層基板製作高效率有機發光電化學元件

Highly Efficient Light-Emitting Electrochemical Cells Based on Diffusive Substrates

陳彥志(Yan-Zhi Chen)

指導教授 ： 蘇海清

國立交通大學/光電學院/影像與生醫光電研究所/碩士(2019年)

摘要

固態有機發光電化學元件具有單一主動層的簡單結構、低操作電壓、可使用低活性的陰極材料及溶液製程等多項優點，使得元件製程難度大大降低，因此有機發光電化學元件的技術受到許多關注。雖然有許多研究針對材料的性能提升做了許多努力，但是有機發光電化學元件的效率仍因為材料本身性能的限制而難再進一步提升，因此近幾年來透過光學萃取技術提升元件之效率等方式逐漸成為熱門的研究題目。
在本論文將針對藍光及白光電化學元件，各設計四組不同參數的元件，以使用玻璃基板的元件作為對照組，並透過其他三組使用不同條件的散射層基板做為實驗組，分別探討使用散射層基板後元件的光學變化。透過量測得知，在使用最佳的散射層的情況下，藍光電化學元件的亮度、電流效率及功率效率均能提升1.41倍，並且外部量子效率更是有2.16倍的提升達到35.4%。此外白光電化學元件也有顯著的提升，其亮度、電流效率及功率效率均能提升1.64倍，外部量子效率則提升1.96倍達到22%。
最後再藉由使用光學模擬軟體來分析元件內部各個模態的比例，更進一步驗證散射層基板藉由提取侷限於基板模態和波導模態中的光，導致元件出光量及效率增加，並且達到我們希望元件能高效率提升的目標。

關鍵字

高效率有機發光電化學元件 ； 散射層基板 ； 微共振腔效應

並列摘要

Solid-state light-emitting electrochemical cells (LECs) have many advantages, such as simple structure of single active layer, low-voltage operating, compatibility with inert cathode materials and solution process, which greatly reduce the difficulty of fabrication process. Therefore, studies on LECs have recently attracted much attention. Although many studies have made great efforts to improve the performance of materials, enhancing the device efficiency of LECs is still highly desired because of the limitations of the properties of materials themselves. Therefore, in recent years, improving the device efficiency of LECs by employing light extraction techniques have gradually become a hot research topic.
In this thesis, four groups of diffusive substrates with different parameters are designed for blue and white LECs. The non-diffusive glass substrates are used in control devices and the other three diffusive substrates with different parameters are used in experimental devices. The EL characteristics of these LECs are measured and discussed. The measurement results show that the brightness, current efficiency and power efficiency of the blue LECs can be increased by 1.41 times when the best diffusion layer of doping proportion is used, and the external quantum efficiency can be increased by 2.16 times to 35.4 %. In addition, the white LECs are also significantly improved, the brightness, current efficiency and power efficiency can be increased by 1.64 times, and the external quantum efficiency is increased by 1.96 times to 22 %.
Finally, the percentage of each optical mode for these LECs is analyzed by using optical simulation software. Simulation results confirm the rationality of the enhanced outcoupled light when the diffusive substrates are utilized.

並列關鍵字

Highly Efficient Light-Emitting Electrochemical Cells ； Diffusive Substrates ； microcavity effect

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