Polymeric carbon nitride (CNxHy) has been facilely synthesized from dicyandiamide and functions as a solution-processed hole injection layer in organic light-emitting diodes (OLEDs). The measurements using X-ray diffraction, atomic force microscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and impedance spectroscopy elucidate that CNxHy exhibits superior film morphology and extra electric properties such as tailored work function and tunable hole injection. The luminous efficiency of CNxHy-based OLED is found to improve by 76.6% in comparison to the counterpart using favorite solution-processed poly(ethylene dioxythiophene):poly(styrene sulfonate) as the hole injection layer. Our results also pave a way for broadening carbon nitride applications in organic electronics using the solution process.

中文翻译：

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溶液处理聚合氮化碳的可调空穴注入用于高效有机发光二极管

聚合氮化碳 (CNxHy) 已由双氰胺轻松合成，可用作有机发光二极管 (OLED) 中的溶液处理空穴注入层。使用 X 射线衍射、原子力显微镜、X 射线光电子能谱、紫外光电子能谱和阻抗谱进行的测量表明 CNxHy 具有优异的薄膜形态和额外的电性能，例如定制的功函数和可调空穴注入。与使用最受欢迎的溶液处理聚（亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）作为空穴注入层的对应物相比，基于 CNxHy 的 OLED 的发光效率提高了 76.6%。我们的结果还为使用溶液工艺扩大氮化碳在有机电子产品中的应用铺平了道路。