溶液製程有機發光二極體元件雖然具低成本、易大面積化等優點，但其在電性與穩定度方面仍不及真空蒸鍍的元件。溶液製程OLED目前多使用PEDOT:PSS作為電洞注入層材料，但PEDOT:PSS會酸蝕ITO基板，造成元件穩定度下降，因此若想要提升元件電性與穩定度，必須先針對電洞注入層做改良或替換。
本論文以此為出發點，主要是以刮刀塗佈技術在小面積綠磷光元件上嘗試不同的電洞注入層，並分析探討其特性優劣與原因；包含材料的溶解性、熱處理條件、膜面完整性對元件電性的影響。 本論文將研究討論的主軸分為兩部分，第一部分為以磷鉬酸（phosphomolybdic acid, PMA）作為電洞注入層，試圖在材料上尋求突破；另一部分為藉由摻雜其他材料改善原材料的不足，在PEDOT:PSS中添加PFI以增加電洞注入能力，在PMA中混合高分子抑制其聚集，藉此改善溶解度問題並提升膜面品質，這部分以PMA混和PEDOT:PSS有最佳效果，和PEDOT:PSS相比，發光效率提升了1.5 cd/A左右，從起始亮度1000 cd/m2到500 cd/m2的操作壽命更提升了4倍。

Although solution-processed organic light-emitting diode has the advantages of low cost, large area, etc, it is still not an opponent of the vacuum-evaporated device in terms of electrical properties and stability. Solution-processed OLEDs currently use PEDOT:PSS as a hole injection layer material. However, PEDOT:PSS will etch the ITO substrate and lead a bad influence on the stability of the device. Therefore, if we want to improve the property and stability of components, we must first improve or replace the hole injection layer. In this thesis, different hole injection layers were tried on small-area green phosphorescent organic light-emitting diodes by the blade coating, and the reasons of their electrical properties were analyzed, including the solubility of the material, thermal treatment conditions, the integrity of the thin film. The main axis of this thesis is divided into two parts. The first part is to use PMA as a new hole injection layer, trying to make a breakthrough in the material. The other part is to improve the weak points of raw material by adding other materials to it. Mixing PEDOT:PSS with PFI can increase the hole injection ability. Mixing polymer with PMA can suppress molecular aggregation, improve the solubility problem, and improve the thin film quality. In this part, the best result is blending PMA and PEDOT:PSS. Compared with PEDOT:PSS, the current efficiency increased by 1.5 cd/A, and the operating lifetime is even 4 times better from the initial brightness of 1000 cd/m2 to 500 cd/m2.

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