芴、三苯胺共聚高分子的光誘導交聯之合成與性質探討及其在高分子發光二極體之應用

Abstract

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.