| 초록 |
Many studies have been demonstrated that carbon quantum dots (CQDs) can emit multicolor light emission with a high quantum yield and a narrow full-width half maximum (FWHM). However, there is still limited to mass production of CQDs with desirable optical properties. Herein, we report a facile synthetic route for mass production of CQDs in terms of treatment of alkali, acid and ethanol, subsequently. Furthermore, amination of CQDs were conducted by using ammonia solution and hydroxy hydrate to increase quantum yield. Nitrogen-doped carbon quantum dots (NCQDs) were synthesized through solvothermal method by using citric acid and urea in the weight ratio of 1 to 2 (1 g : 2 g) in N, N-dimethylformamide (DMF), resulting in 43.9 mg of NCQDs. The photoluminescence emission of NCQDs is observed at the wavelength of 420 nm, 525 nm and 625 nm, respectively. The quantum yield was measured by 8.41 % and the average lifetime is 6.57 ns at the emission wavelength of 620 nm with the excitation at 467 nm. Our work provides an effective route for mass production of NCQDs with multicolor light emission by subsequent chemical treatment, which can be used for CQD-based light emitting devices. |
