Semi-orthogonal solution processing can circumvent interface intermixing issue of construction of multilayer polymer light-emitting diode devices (PLEDs). In this manuscript, we developed a new strategy to construct multilayer PLEDs by the semi-orthogonal solvents based on the difference between the solubilities of a poly(9,9-dioctylfluorene) that end-capped with a triphenylamine derivative (PFO-TF) (processed with p-xylene) and the light-emitting polymer PPF-SO15 or PPF-SO15-BT1 (processed with 1,4-dioxane). As the highest occupied molecular orbital energy level of PFO-TF (−5.70 eV) lies in between PEDOT:PSS (−5.20 eV) and the light-emitting copolymer PPF-SO15 (−5.94 eV), it can serve as the hole transport layer (HTL) to facilitate hole injection. The blue PLED based on PFO-TF as the HTL exhibits lower turn-on voltage and nearly identical electroluminescent spectra as that of the control device without HTL. Of particular importance is that the blue device with PFO-TF as the HTL exhibits the luminous efficiency over 5.0 cd A⁻¹, which is much higher than that observed from a device without an HTL (3.51 cd A⁻¹) or one with traditional poly(9-vinylcarbazole) as the HTL (4.74 cd A⁻¹). Similar trend is also realized for PLEDs based on green-light-emitting polymer PPF-SO15-BT1. These observations indicate that processing of a multilayer device with this specific semi-orthogonal system may be a promising strategy for the construction of efficient PLEDs.

半正交溶液处理可以避免多层聚合物发光二极管器件（PLED）构造中的界面混合问题。在本手稿中，我们基于以三苯胺衍生物（PFO-TF）封端的聚（9,9-二辛基芴）的溶解度之间的差异，开发了一种通过半正交溶剂构建多层PLED的新策略（用p处理-二甲苯）和发光聚合物PPF-SO15或PPF-SO15-BT1（用1,4-二恶烷处理）。由于PFO-TF的最高占据分子轨道能级（−5.70 eV）在PEDOT：PSS（−5.20 eV）和发光共聚物PPF-SO15（−5.94 eV）之间，因此可以用作空穴传输层（HTL）以促进空穴注入。基于PFO-TF作为HTL的蓝色PLED与没有HTL的控制设备相比，具有较低的开启电压和几乎相同的电致发光光谱。尤其重要的是，以PFO-TF作为HTL的蓝色设备在5.0 cd A ^-1以上的发光效率要比没有HTL的设备（3.51 cd A ^-1）或传统设备的发光效率高得多。聚（9-乙烯基咔唑）作为HTL（4.74 cd A ^-1）。对于基于绿色发光聚合物PPF-SO15-BT1的PLED，也实现了类似的趋势。这些观察结果表明，使用这种特定的半正交系统对多层器件进行处理可能是构建高效PLED的有前途的策略。