| 초록 |
Graphene quantum dots (GQDs) have attracted great attention as a new luminescent material due to their unique optical properties, stable photoluminescence and biocompatibility. In addition, GQDs consist of low cost carbon elements and have low toxicity as a good alternative to the conventional inorganic quantum dots which contain toxic metals. Moreover, many synthetic methods still have low quantum yield (QY) for optoelectronic applications and have a broad size distribution. In this work, we obtained uniform and nitrogen-doped GQDs (NGQDs) with significantly enhanced QY based on bottom-up method. By doping nitrogen atoms into the GQDs, the relative QY of NGQDs was improved by more than three times compared to that of reference GQDs. Furthermore, NGQDs have a narrow size distribution without the complicated size selection procedure. By obtaining both high QY and uniformity, NGQDs have a potential for future applications such as light emitting diodes, solar cells, and bio-imaging. |
