Materials with tunable photoluminescence (PL) are highly desirable. It can lead to important applications such as photodetectors, bio-imaging, and broadband modulators. In this work, nitrogen-doped graphene oxide quantum dots (NGOQDs) were synthesized by hydrothermal method. The microstructures as well as optical properties of NGOQDs were studied. The as-prepared NGOQDs present tunable PL and exhibit a maximal PL blue-shift of ca. 88 nm compared to that of the graphene oxide quantum dots (GOQDs). The observed PL blue-shift of the NGOQDs is attributed to the high content of pyridine-like and pyrrolic-like nitrogen atoms doping in the NGOQDs. Our proposed mechanism for the PL blue-shift of the NGOQDs is supported by density functional theory (DFT) calculations.

具有可调光致发光（PL）的材料是非常需要的。它可以导致重要的应用，例如光电探测器，生物成像和宽带调制器。在这项工作中，通过水热法合成了氮掺杂的氧化石墨烯量子点（NGOQDs）。研究了NGOQD的微观结构和光学性质。所制备的NGOQD呈现可调PL并显示约PL的最大PL蓝移。与氧化石墨烯量子点（GOQD）的88 nm相比。NGOQDs观察到的PL蓝移归因于NGOQDs中高含量的吡啶类和吡咯类氮原子掺杂。我们提出的NGOQD的PL蓝移机制由密度泛函理论（DFT）计算支持。