利用分子自我組合的方式以N-苯基胺丙基三甲基矽烷 (N- phenylaminopropyltrimethoxysilane) 分子修飾ITO電極，再於其上利用無電化學聚合方式聚合聚苯胺薄膜。經表面修飾的ITO電極上所聚合出來的聚苯胺薄膜比未經修飾的ITO電極上所聚合的聚苯胺薄膜較為緻密與平坦，經過電化學循環伏安法的測試，也證實在經由表面修飾的ITO電極上所聚合出來的聚苯胺薄膜有較好的電化學活性及穩定性。以ITO電極為陽極、利用上述方法所得的聚苯薄膜為電洞傳遞層、再鍍上MEH-PPV以及鋁金屬陰極製成雙層有機高分子發光二極體。其中做為電洞傳遞層的聚苯胺所含之摻雜子不同對所製成的發光二極體的驅動電位影響也不相同，其中以樟腦磺酸為摻雜子的聚苯胺做為電洞傳遞層之發光二極體的驅動電位較低(為7.5 V)，比不含聚苯胺電洞傳遞層之單層發光二極體的驅動電位低約2 V，並且有較好的穩定性。另外隨著通過的電流增加，發光二極體的亮度也隨之增加，而具有電洞傳導層的發光二極體可承受較大的電流。在大氣下組裝及測試之雙層高分子發光二極體，其亮度為140 Combining the molecular self-assembly properties and thin film preparation technique, we are able to synthesize highly-density and more flat polyaniline (PANI) films by electroless surface chemistry polymerization. The substrates (ITO electrode) were first modified with Aniline-contanining silane compound ( N-phenylaminopropyltrimethoxy- silane ) to from a monolayer organic molecular film. The deposition of PANI film was then carried out by contacting the monomer primed substrate with monomer and oxidant in acidic aqueous solution. Cyclic voltametry were used to characterize the electrochemical property and stability of these chemically polymerized PANI films. It was found that the PANI film prepared on Aniline primed substate have better electrochemical activity and stability. PANI film prepared with this method was used as a hole transport layer in polymeric organic light emitting diode (POLED) using MEH-PPV as an emitting layer and evaporated Al metal as a cathod. The structure (dopants) of PANI film will affect the operation Voltage of this bilayer device. The operation voltage is 7.5V when CSA doped PANI film was used as a hole transport layer. This voltage is 2V lower than the device without polyanilne hole transport layer test at the same environment. The luminance of this bi layer PLED, fabricated and test in an ambient atomosphere, is 140 cd/m²
