以聚苯胺/銀奈米複合材料與苯胺寡聚物為有機發光二極體之電洞注入層的探討

A study on organic light-emitting diodes with polyaniline/silver nanocomposite and oligomer of aniline as a hole injection layer

吳哲睿(Jhe-Ruei Wu)

指導教授 ： 邱寬城

中原大學/理學院/物理研究所/碩士(2010年)

https://doi.org/10.6840/cycu201001019

摘要

本研究在有機發光二極體 (Organic light-emitting diode, OLED) 元件中，使用溶於NMP溶劑中的聚苯胺 (Polyaniline, PANI) 摻雜不同濃度之硝酸銀與苯胺寡聚物 (Oligomer of aniline) 共四種溶液旋轉塗佈於陽極上作為電洞注入層 (Hole injection layer, HIL)。由電流對電壓與光強度對電壓的量測結果可以得知PANI摻雜硝酸6% 與苯胺寡聚物兩種溶液旋轉塗佈於陽極上作為HIL，會使得元件整體效能有較大的提升，所以本研究利用下述量測方式來分析導致效能提升或降低（相較於沒有HIL之傳統結構元件）的機制為何。
藉由掃描式電子顯微鏡 (SEM) 之俯視圖來分析各種HIL之表面形貌是否有助於電荷傳遞，並由側視圖可以得到HIL之膜厚。
藉由原子力顯微鏡 (AFM) 來分析各種HIL之表面粗糙度來判斷哪種HIL 與電洞傳輸層 (Hole transport layer, HTL) 間有較好的接合面，同時好的接合面也意味著電洞由HIL注入到HTL有較好的注入效率，並使得元件整體效能提升。
藉由X光粉晶繞射儀 (XRD) 來觀測PANI摻雜硝酸銀的粉末溶於NMP並利用旋轉塗佈於陽極上成膜後，薄膜中是否仍有奈米銀顆粒存在，以探討奈米銀顆粒對於電荷傳導機制的影響，進而影響到元件整體的效能。
藉由光穿透頻譜來觀測經過HIL表面改質後之陽極透光率；因為透光率會直接影響到元件的光強度，從而影響到元件的發光效率。

關鍵字

有機發光二極體 ； 表面改質 ； 苯胺寡聚物 ； 聚苯胺 ； 電洞注入層

並列摘要

In this study, there are four solutions fabricated by polyaniline (PANI) doped with different concentration of silver nitrate and aniline of oligomer which are respective dissolved in the solvent of NMP. These solutions are spin-coat on the anode of organic light-emitting diode (OLED) as a hole injection layer (HIL). Through the results of measuring the current density versus voltage and the EL intensity versus voltage, it shows a significant increase of OLED device’s performance when the solutions of PANI doped with silver nitrate 6% and aniline of oligomer are spin-coated as a HIL. There are some measurements to analyze the mechanism of the OLED device’s performance is increasing or decreasing which are below this paragraph.
Through scanning electron microscope (SEM) to analyzes the morphology of top view of the different HIL whether contribute to charge transport. And the thickness could be taken by the side view of the different HIL.
Through atomic force microscopy (AFM) to analyzes the surface roughness of different HIL. Then we can discern which one of the HILs provided with the better contact of the interface between the HIL and hole transport layer (HTL). And the better contact of the interface implies that there is a hole injection from HIL to HTL has higher injection efficiency.
Through X-ray diffraction to observe the powder of PANI doped with different concentration of silver nitrate dissolved in the solvent of NMP which spin-coating on the anode. To discuss whether the thin film on anode possess of nano-silver granule, then we may discuss the nano-silver granule whether play an important role in the charge transport mechanism.
Through optical transmission to observe the transmissivity of the anode after surface modification. Because of the transmissivity will affect the light-emitting intensity immediately.

並列關鍵字

Surface modification ； OLED ； Oligomer ； PANI ； HIL

參考文獻

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