A New Supramolecular Thiophene-Based Hole-Transport Material for Advanced Light-Emitting Diodes and optoelectronic devices

• Main Authors: Huang, Pei-Hsiu, 黃培修
• Other Authors: Chang, Feng-Chih
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/92598397299276924957

碩士 === 國立交通大學 === 應用化學系碩博士班 === 99 === A new concept to modify and enhance properties of existed functional polymers through bio-complementary interaction has been exploited. In this thesis, new DNA-mimetic π-conjugated poly(3-thiophene)s (P3HT) have been prepared which exhibits high thermal stability, non-corrosion, excellent hole injection and electron-blocking abilities in the solid state owing to the uracil induced physical cross-linking. The self-complementary phenomena were investigated by 1H NMR titration, DSC, WAXD and AFM in cast film provided further details into the nature of the self-assembly of these systems. Moreover, electrochemical studies reveal that the energy level of the highest occupied molecular orbital (HOMO) for these materials is between -5.12 and -5.17 eV, which is a good match for the work function of indium tin oxide (ITO), a commonly used anode for organic and polymer light-emmitting diodes (OLED and PLED). When the uracil-containing P3HTs are utilized as a hole-transporting layer (HTL) in the double layers OLED device, we found that the performance of the resulting device can be “ten times” higher than the high regularity and low regularity P3HTs and the performances are comparable to devices composed of the conventional PEDOT-PSS as HTLs with relatively less corrosive. This newly developed material may provide a potential route towards next-generation high-efficiency LED devices.