Synthesis of Polymers Containing Pendent Arylsilane-Modified Carbazole and the Application on Blue Phosphorescent Polymer Light Emitting Diodes

本論文的研究是合成側鏈含發光基團的高分子，應用於高分子發光二極體中的主發光體材料，透過自由基聚合反應，合成一系列側鏈含矽苯修飾咔唑均聚物，其中咔唑具有良好的電洞傳遞性質和較高的三重態能隙。矽苯基團具有中斷共軛使高分子三重態能隙提高的效果，且引入巨大的矽苯基團於高分子側鏈可抑制分子的堆疊避免客發光體因為自我聚集造成濃度焠熄的現象。藉由觀察材料的熱穩定性質、光學性質變化、電化學性質等，並製作有機電激發光元件，以探討材料的結構設計對元件發光效率的表現。 因為咔唑和矽苯屬剛硬的結構，因此高分子皆有高的玻璃轉移溫度和熱裂解溫度，顯示材料有良好的熱穩定性質。高的三重態能隙使能量可以有效傳遞至客發光體。電化學研究發現，材料具有良好的電洞傳遞特性，能階匹配元件製作所需的材料。 藍光電激發光元件以P1摻雜20 %的FIrpic和40 %的TRZ有最佳的表現，元件結構為ITO/PEDOT/P1:FIrpic 20 %:TRZ 40 %/Mg/Ag，最大亮度2460 cd/m2，最大效率為4.93 cd/A。在白光電激發光元件方面以P1為主發光體所製備的元件具有最佳表現，元件結構為ITO/PEDOT/P1:FIrpic 20 %:Ir(2-phq)2acac 0.4 %:TRZ 40 %/Mg/Ag，最大亮度為4000 cd/m2，最大效率為5.13 cd/A。In this study, polymers containing pendant emitting groups are synthesized and used as host materials for polymer light emitting diodes. By free radical polymerization, we synthesize a series of polymers containing pendant arylsilane-modified carbazole. Carbazole has good hole-transporting characteristic and high triplet energy gap. Arylsilane group could interrupt conjugation length and raise triplet energy level. The bulky arylsilane group could restrain polymer aggregation preventing guest self-quenching. The thermal stability, optical properties, electrochemical properties, and the electroluminescent performance are discussed. All the polymers show good thermal stability with high glass transition temperature and decomposition temperature due to their rigid structure. The high triplet energy gap of polymers can efficiently assist energy transfer to the guest. The electrochemical behaviors reveal that the energy levels of polymers match the material used in devices. The best blue electroluminescent device is ITO/PEDOT/P1:FIrpic 20 %:TRZ 40 %/Mg/Ag which has maximum luminance 2460 cd/m2 and maximum current efficiency 4.93 cd/A. The best white electroluminescent device is ITO/PEDOT/P1:FIrpic 20 %:Ir(2-phq)2acac 0.4 %:TRZ 40 %/Mg/Ag which has maximum luminance 4000 cd/m2 and maximum current efficiency 5.13 cd/A