عنوان	Optimization of high efficiency blue emissive N-, S-doped graphene quantum dots
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Solvothermal,Graphene quantum dots,Blue emission,High emission quantum yield
چکیده	Graphene quantum dots (GQDs) with bright emission at short wavelengths have attracted much attention due to their importance in various applications such as light-emitting diodes. During or after synthesis, several parameters can significantly improve the optical properties of GQDs. This study presents a facile solvothermal method with low-cost precursors using glutamic acid as the carbon source to realize blue emitting GQDs. The positive effects of urea and 1-octanethiol as nitrogen and sulfur dopants on the photoluminescence quantum yield (PLQY) of the prepared GQDs were demonstrated and optimized. The results confirmed the formation of 2.2 nm nanoparticles with a bright emission around 381 nm with a full width at half maximum of 58 nm and a PLQY approaching 70 %. The decay lifetime of the emission also showed a tri-exponential profile with an average lifetime of 2.4 ns. The simplicity of the preparation method without any post-treatment process, together with a high PLQY of 70 % at short wavelengths, nominates the prepared GQDs for optoelectronics and UV light-driven biological purposes.
پژوهشگران	کوثر شاهین تراش (نفر اول)، احسان سهیلی (نفر دوم)، زینب شریفی راد (نفر سوم)، اورن موتلوگون (نفر چهارم)