近年來,對於以cabazole及fluorene為骨架所衍生的芳香胺(arylamines)類衍生物作為有機電致發光材料的研究,有相當多的實例。由於cabazole之3、6、9位置及fluorene之2、7、9位置很容易引入取代基,於是我們開發出一系列包含iminostilbene、iminodibenzyl或cabazole及其衍生物之cabazole 3,6-diamine及fluorene 2,7-diamine之化合物。 本論文將利用熱重分析儀(thermogravimetric, TGA)評估其熱穩定性,後以差相掃瞄卡計儀(differential scanning calorimetry, DSC)觀察其相轉變,以瞭解分子中樹枝狀片段對整體分子結構的影響。接著對此類化合物進行一系列之光物理研究,包括:拉曼、吸收、放射光譜、螢光量子產率的測量;同時也將利用循環伏安法(CV)評估其氧化還原行為和測定其HOMO-LUMO能階。我們將對此類化合物以旋轉塗佈法或真空蒸鍍法的方式製作電洞傳輸層,並搭配合適的電子傳輸層製作發光二極體元件,並測量其光電性質。 值得注意的是,cabazole 3,6-diamine與Alq3搭配的元件中,以cabazole 3,6-diamine為電洞傳輸層時,可使得Alq3的放光效率及亮度增加,且由於此一系列的化合物具有穩定的電化學性質與熱穩定性,所以此一系列的化合物可說是具有潛力的電洞傳輸層材料。
Palladium catalyzed C-N bond formation between dibromo-compound and diarylamines provides stable carbazole and fluorene derivatives that contain two peripheral diarylamines. They are fairly thermal stable(Td > 298 ℃) with glass transition temperatures(Tg of greater than 107 ℃). The fluorene color of these amorphous carbazole and derivatives are fluorescent in the blue - green region. And two types of light-emitting diodes were fabricated.(Ⅰ) ITO / diamine / Alq3 / Mg:Ag.(Ⅱ) ITO / diamine / TPBI / Mg:Ag. The photoluminescence properties and quasi-reversible redox behavior of these carbazole derivatives make them applicable as an active material for a light-emitting device. Several green light emitting devices exhibit satisfactory maximum brightness and their opto-electronic performance appears to be better than those of typical green light-emitting devices of the structure ITO/diamine/Alq3/Mg:Ag.