在本研究中,利用Suzuki-Miyamura反應合成一系列三苯胺和芴的共聚高分子,並利用凝膠滲透層析儀、熱重分析儀、示差掃描卡計、循環伏安儀、吸收光譜與螢光光譜儀來研究其性質。 當三苯胺衍生物及光酸加入高分子,經由UV照光後可使其進行Friedel-Crafts的反應,交聯形成網路狀的結構,對溶劑具有抵抗的能力。應用於高分子發光二極體的多層元件中,作為電洞傳導層,ITO/光交聯的HTL/PVK-Ir(ppy)3-PBD/Mg-Ag,其驅動電壓為9.4 V,最大亮度為7630 cd/m2,效率可達15.8 cd/A。 利用Friedel-Crafts反應將高分子修飾上二茂鐵的單元,當三苯胺衍生物加入,經由UV照光進行交聯,這部分應用於高分子發光二極體中,來幫助電洞的注入,此外在循環伏安法測量下,可觀察到電聚現象發生。
In this studies, a series of copolymers were synthesized by triphenylamine and fluorene via Suzuki-Miyamura reaction, which were characterized by gel permeation chromatography (GPC), thermal gravimetric analyzer (TGA), differential scanning calorimeter (DSC), cyclic voltammetry (CV), absorption and photoluminescence spectroscopy (PL). The polymers were cross-linked by adding the triphenylamine derivative and the photo acid generator which catalyzed Friedel-Crafts reaction under UV irradiation. This approach can be implemented to PLED applications as hole-transporting layer. Under the optimized conditions, the polymeric light-emitting device (PLED) of ITO/photo-cross-linkable HTL/PVK-Ir(ppy)3-PBD/Mg-Ag, with a turn-on voltage of 9.4 V (100 cd/m2), a maximum brightness of 7630 cd/m2, and a current efficiency of 15.8 cd/A was achieved. The polymer which modified with ferrocene units by Friedel-Crafts reaction could be cross-linked by triphenylamine derivative under UV irradiation. This moiety is introduced into the polymer light-emitting diodes to help the hole injection. In addition, the polymer could undergo electropolymerization by cyclic voltammetry.