本研究主要利用濕式塗佈技術(wet coating)製備高分子發光二極體(polymer light emitting diodes, PLED)。PLED結構為兩電極間夾著有機高分子層，包含電洞注入層(hole injection layer)、發光層(emitting layer)與電子傳導層(electron transporting layer)。其原理為施加電壓後陰陽極產生分別電子電洞並注入有機層再結合而放光。
本研究分別以高分子PFO [Poly(9,9-dioctylfluorenyl-2,7-diyl) end capped with N,N-Bis(4-methylphenyl)-4-aniline]與PEDOT:PSS [Poly(3,4-ethylenedioxythiophene):poly(styrene)]做為發光與電洞注入材料，首先利用旋轉塗佈技術製作出小面積藍光PLED；並改變條件與加入小分子電子傳導材料以尋求最佳元件性能。待材料與結構確定後，再嘗試以狹縫式塗佈技術(slot die coating)製備高分子薄膜。為了克服PEDOT:PSS難以成膜的問題，本研究嘗試加入其他溶劑並改變乾燥條件而成功塗佈出PEDOT:PSS薄膜；接著將PFO成膜於PEDOT:PSS上。PFO薄膜在乾燥過程中會產生許多乾燥缺陷，本研究改變溶劑與塗佈條件而大幅減少乾燥缺陷。最後嘗試以狹縫式塗佈技術製備2cm×2cm的PLED元件，證明以狹縫式塗佈製備PLED是可行的。

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