Since the low work function of ITO, introducing hole injection layer (HIL) with controllable and efficient property is an effective way to improve the performance of organic light-emitting diodes (OLEDs). In this work, films, containing molybdenum oxide units by employing H₂O₂ treated ammonium phosphomolybdate (AMP) as precursors, are fabricated through solution-processed procedure. The hole injection property of the HILs can be modulated by the gap-state density, which is negatively correlated with the molar ratio of AMP/H₂O₂. Green fluorescent and phosphorescent OLEDs based on the HILs are endowed with reduced turn-on voltage from 3.4 to 2.5 V and 4.1 to 3.4 V, respectively. Furthermore, fluorescent OLEDs based on the HIL with AMP/H₂O₂ of 1:14 show a maximum current efficiency of 6.82 cd/A, 1.2-flod higher than that of PEDOT:PSS based devices. This method opens up a new path to obtain HIL with adjustable property in mild prepare condition for various electroluminescent devices.

由于ITO的低功函，引入具有可控且高效特性的空穴注入层（HIL）是提高有机发光二极管（OLED）性能的有效途径。在这项工作中，通过H ₂ O ₂处理过的磷钼酸铵（AMP）作为前体，制备了包含氧化钼单元的薄膜，该过程是通过溶液处理的方法制成的。HIL的空穴注入性能可以通过能与AMP / H ₂ O ₂摩尔比成负相关的间隙态密度来调节。。基于HIL的绿色荧光和磷光OLED的开启电压分别降低了3.4至2.5 V和4.1至3.4V。此外，基于AMP / H ₂ O ₂为1:14的HIL的荧光OLED的最大电流效率为6.82 cd / A，比基于PEDOT：PSS的器件的最大电流效率高1.2 Flod。该方法为在各种电致发光器件的适度制备条件下获得具有可调性能的HIL开辟了一条新途径。