期刊
JOURNAL OF LUMINESCENCE
卷 198, 期 -, 页码 215-219出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.02.012
关键词
Carbon dots; Photoluminescence; Surface energy
类别
资金
- Kegiatan Unggulan and Kegiatan Penguatan Kompetensi Inti from Indonesian Institute of Sciences
- Kegiatan Insinas from Kementrian Ristekdikti Republic of Indonesia
Carbon dots are interesting fluorescent nanoparticles to study due to their excelent optical properties and potential applications. However, further exciton study must be done to reveal luminescent origin. In this work, we present exciton dynamic study of carbon dots at room temperature. The carbon dots sample was synthesized from commercial sugar using simple microwave-assisted technique. Photoluminescence study was carefully done using various techniques, such as down and up conversion photoluminescence, time-resolved photoluminescence. Additional measurement such as absorbance spectroscopy and transmission electron microscope (TEM) were utilized. From TEM image, we found that carbon dots have lattice constant approximately 2.94 Angstrom. Furthermore, we can distinguish energy transition in carbon dots, such as core and surface energy, using absorbance and photoluminescence spectra. We found that surface energy become dominant as carbon dots concentration increase. Higher carbon dots concentration shift surface energy of carbon dots. However, this shift was not observed in up-conversion photoluminescence.
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