以2,3苯並呋喃為中心之寬能隙、雙極性之發光材料

Abstract

本篇論文成功開發出四個以phenyl benzofuran為主架構之化合物，並在phenyl環間位(meta-position)導入naphthyl基團或推電子基團phenothiazine及拉電子基團dimesityl boron，使得材料同時具有寬能隙及雙極性，並可以放出可見光乃至藍紫光的雙極子螢光分子。 為了瞭解這四個材料在有機發光二極體材料方面的潛力，我們利用了UV-Vis吸收光譜、螢光放光光譜、光電子光譜來量測其光物理及功函數。此外，本研究也利用TGA、DSC與TOF來證明材料本身的熱穩定性以及電荷遷移率。 四個材料的能隙介於3.28至3.73 eV之間，電荷遷移率接近10-4 cm2/Vs。特別是C-naOL與C-MesOL兩者更具有較高的螢光量子產率，故分別在紫色及藍色螢光電激發光元件的應用上具有一定的潛力。Four phenyl benzofuran derivatives incorporating naphthylene, electron excessive phenothiazine or electron deficient dimesityl boron entities have been developed successfully. In addition to wide energy gap (HOMO/LUMO) and ambipolar characters, the compounds are also emissive in the visible or even blue and violet region. In order to evaluate the potential of the materials in OLED, their photophysical and work function were investigated by UV-Vis absorption and fluorescence spectrum, and photoelectrical spectrum. Inaddition, TGA, DSC and TOF were used for probing the thermo-stability and carrier mobility of the new materials. The HOMO/LUMO energy gap of the compounds ranges from 3.28 to 3.73 eV. These materials also possess excellent carrier mobility of ~10-4 cm2/Vs. Compounds C-naOL and C-MesOL have better quantum yields than the other two and may have good potential as violet- and blue-emitters for OLEDs.