Size Effect of Graphene Quantum Dots on Photoluminescence
Ziyi Liu, Fei Li, Yi Luo, Ming Li, Guanghui Hu, Xianjuan Pu, Tao Tang, Jianfeng Wen, Xinyu Li, Weitao Li
Abstract
High-photoluminescence (PL) graphene quantum dots (GQDs) were synthesized by a simple one-pot hydrothermal process, then separated by dialysis bags of different molecular weights. Four separated GQDs of varying sizes were obtained and displayed different PL intensities. With the decreasing size of separated GQDs, the intensity of the emission peak becomes much stronger. Finally, the GQDs of the smallest size revealed the most energetic PL intensity in four separated GQDs. The PL energy of all the separated GQDs shifted slightly, supported by density functional theory calculations.
Topics & Concepts
PhotoluminescenceQuantum dotGrapheneMaterials scienceIntensity (physics)Hydrothermal circulationDensity functional theoryNanotechnologyChemical engineeringOptoelectronicsChemistryPhysicsComputational chemistryOpticsEngineeringCarbon and Quantum Dots ApplicationsNanocluster Synthesis and ApplicationsLuminescence and Fluorescent Materials