Abstract: In this paper, a facile synthesis of carbon quantum dots (CQDs) and its field emission performance are reported. The CQDs are prepared from a single N, N-dimethylformamide acting as carbon and nitrogen-doping sources simultaneously. The CQDs are investigated by photoluminescence, transmission electron microscopy and x-ray photoelectron spectroscopy. The CQDs have an average size of 3 nm and are doped with N atoms. CQD dispersion shows strong fluorescence under UV illumination. For the first time, the field emission behavior of CQDs coated on Si substrate is studied. As a candidate of cold cathode, the CQDs display good field emission performance. The CQD emitter reaches the current density of 1.1 mA cm(-2) at 7.0 V mu m(-1) and exhibits good long-term emission stability, suggesting promising application in field emission devices.

KeyWords Plus: DIAMOND-LIKE-CARBON; HYBRID FILMS; NANODOTS; NANOTUBES; FLUORESCENCE; ULTRAVIOLET; DEPOSITION; FRAMEWORKS; LIGHT; LAYER

Publlished in NANOTECHNOLOGY, 27 (44):10.1088/0957-4484/27/44/445707 NOV 4 2016