Pham Thu Nga, Nguyen Thi Mai Huong, Le Xuan Hung, Dao Nguyen Thuan, Nguyen Tien Thanh, Yann Bretonnière, Frédéric Lerouge, Alizée Roux, Julien Laverdant
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Radiative and non-radiative transfers in co-doped graphene quantum dots
Doping of luminescent quantum dots is needed to control their optical properties. Inserting defects may change the band gap of the photoluminescence emission as well as their emission rates both radiative and non-radiative. Several doping materials in graphene quantum dots (GQDs) have been previously studied. In this paper, we present the influence of single doping (nitrogen) and co-doping (nitrogen–sulfur) on the optical properties of GQDs. Systematic analysis of the quantum yield in correlation with lifetime measurements enables the extraction of both radiative and non-radiative transfers. By changing the ratio of carbon supply over (S,N) dopants, we can control the emission quantum yield by modifying the radiative and non-radiative transfer rates. Based on our results, we propose an optimal doping concentration for higher quantum yield that maximizes radiative transfers.
期刊介绍：
The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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