Absorption and emission properties of oxidized graphene quantum dots （GQDs） and amino functionalized GQDs （NG） were explored by B3LYP method combined with 6-31G （d） basis set. The oxygen- and nitrogen-containing...Absorption and emission properties of oxidized graphene quantum dots （GQDs） and amino functionalized GQDs （NG） were explored by B3LYP method combined with 6-31G （d） basis set. The oxygen- and nitrogen-containing groups can tune the intensity as well as the wavelength of absorption and emission. The groups such as hydroxyl, carboxyl, amino, amide, and pyridine-like N can appropriately lengthen the absorption and emission wavelength of GQDs. However, the carbonyl group, graphitic-like N, and pyrrolic-like N obviously decrease the oscillator strength and lengthen the emission wavelength of GQDs out of the visible region. The lowest excited state S_1 of NG has the strongest emission in investigated complexes, which indicates that it is an excellent luminous material. The theoretical investigations verify that the oxygen- and nitrogen-related groups can tune the luminescence of GQDs. The fluorescence quenching of GQDs reduced by ammonia mainly depends on the graphitic-like and pyrrolic-like N.展开更多
基金supported by the Scientific Research Fund of Science&Technology Department of Sichuan Province(201l JYZOl8)Education Department of Sichuan Provincial(12ZA170)
文摘Absorption and emission properties of oxidized graphene quantum dots （GQDs） and amino functionalized GQDs （NG） were explored by B3LYP method combined with 6-31G （d） basis set. The oxygen- and nitrogen-containing groups can tune the intensity as well as the wavelength of absorption and emission. The groups such as hydroxyl, carboxyl, amino, amide, and pyridine-like N can appropriately lengthen the absorption and emission wavelength of GQDs. However, the carbonyl group, graphitic-like N, and pyrrolic-like N obviously decrease the oscillator strength and lengthen the emission wavelength of GQDs out of the visible region. The lowest excited state S_1 of NG has the strongest emission in investigated complexes, which indicates that it is an excellent luminous material. The theoretical investigations verify that the oxygen- and nitrogen-related groups can tune the luminescence of GQDs. The fluorescence quenching of GQDs reduced by ammonia mainly depends on the graphitic-like and pyrrolic-like N.
