交聯型聚芴高分子的合成及其 光電性質的探討

The Synthesis and Optoelectronic Properties of Crosslinkable Polyfluorene

王英全(Ying-Quan Wang)

指導教授 ： 林金福

國立臺灣大學/工學院/高分子科學與工程學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.00234

摘要

本研究成功合成出polyfluorene衍生物，poly(9,9’-dihexylfluorene-co-N-(4-butylphenyl)diphenylamine) (PFA)和poly(9,9’-dihexylfluorene-co-benzothiadizole) (F6BT)與帶oxetane官能基的 PFAO和F6BTO。首先利用H1-NMR鑑定結構。由熱性質分析得知熱裂解溫度都可超過410℃。由Dsc圖譜得知在Polyfluorene側鏈位置導入oxetane官能基會使高分子的Tg稍微降低。從交聯後溶解度測試得知，PFAO和F6BTO只有部分交聯。兩者摻合再交聯後，由螢光顯微鏡觀察表面形態得知利用交聯方式可減少PFAO與F6BTO分相後domain size。另一方面由實驗所製作的高分子發光二極體元件測試，經分相後所產生的”type-II” heterojuction可有效降低起始電壓至2.4V，且摻合交聯後，更可使最大亮度提升到2518 cd/m2 ，最大效率值達到1.26cd/A。由此結果判定發光層摻合後再交聯製作的元件更容易產生”type-II” heterojuction。

關鍵字

聚芴 ； 環氧丙烷

並列摘要

In this work, we have successfully synthesized polyfluorene derivatives, poly(9,9’-dihexylfluorene-co-N-(4-butylphenyl)diphenylamine) (PFA) and poly(9,9’-dihexylfluorene-co-benzothiadizole) (F6BT) with and without containing the oxetane crosslinkable group. They degraded at temperature up to 410℃.DSC results indicated that the Tg of PFAO and F6BTO was reduced by incorporating the oxetane group into the side chain. From the solvent resistibility test, we knew that PFAO and F6BTO could be crossinked partially. The fluorescent microscopy of their blend revealed that the domain size resulted from phase separation was reduced by crosslinking. As they were fabricated into polymer light emitting diodes (PLED), they also showed that the blend system had lower trun-on voltage compared to their individual components due to the formation of ”type-II” heterojuction. After crosslinking, the highest brightness of the PLED is up to 2518cd/m2 and the EL efficiency is up to 1.26cd/A.. Apparently, crosslinking could increase the number of exciplexes formed in the region of ”type-II” heterojuction.

並列關鍵字

polyfluorene ； oxetane

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