The reported NiO_x interfacial layers in blue perovskite light-emitting diodes (PeLEDs) usually require high-temperature annealing and complex interface modification. Herein, we report a kind of uniform NiO_x anode interfacial layer induced by H₂O treatment, which effectively enhances the brightness and light-emitting efficiency of blue PeLEDs simultaneously. Compared to the as-prepared NiO_x anode interfacial layer, H₂O treatment renders uniform and pinhole-free NiO_x morphology. The solution-processed perovskite blue emissive layer prepared atop the H₂O-treated NiO_x interfacial layer demonstrates enhanced photoluminescent property and superior morphology with low trap density. The blue PeLEDs employing H₂O-treated NiO_x as anode interfacial layer show a maximum luminance of 9052 cd/m² and a maximum external quantum efficiency (EQE) of 1.80%, whereas the control device based on the as-prepared NiO_x anode interfacial layer merely exhibits a maximum luminance of 3850 cd/m² and an EQE of 0.88%, leading to about 135% and 104% increase in brightness and efficiency, respectively. The PeLEDs emit pure blue light with emission peak located at 482 nm and demonstrate superior spectral stability under different driving voltages and operating time.

据报道，蓝色钙钛矿发光二极管（PeLED）中的NiO _x界面层通常需要高温退火和复杂的界面改性。在此，我们报告了一种通过 H ₂ O 处理诱导形成的均匀 NiO _x阳极界面层，它同时有效地提高了蓝色 PeLED 的亮度和发光效率。与所制备的 NiO _x阳极界面层相比，H ₂ O 处理呈现出均匀且无针孔的 NiO _x形态。在 H ₂ O 处理的 NiO _{x 上}制备的溶液处理的钙钛矿蓝色发光层界面层表现出增强的光致发光性能和具有低陷阱密度的优异形态。采用 H ₂ O 处理的 NiO _x作为阳极界面层的蓝色 PeLED显示出 9052 cd/m ²的最大亮度和 1.80% 的最大外部量子效率 (EQE)，而基于所制备的 NiO _x的控制装置阳极界面层仅表现出 3850 cd/m ²的最大亮度和 0.88% 的 EQE，分别导致亮度和效率增加约 135% 和 104%。PeLED 发出纯蓝光，发射峰位于 482 nm，在不同的驱动电压和工作时间下表现出卓越的光谱稳定性。