Carbon Dot-NaCl Crystals for White-Light Generation and Fabry-Perot Lasing

Phosphor materials with broad spectral range and an average emission lifetime (20 mu s) have been achieved from carbon dots (CDs)-NaCl crystals. A one-pot synthesis pathway has been developed for CDs-NaCl crystals formation at room temperature. Precursor for CDs materials was screened at room temperature by oxidation methodology from different simple sugar molecules. CDs (size less than 10 nm) prepared from the fructose sugar exhibit most intense emission. Utilizing ripe banana peel (contains similar to 27% of fructose) as a precursor for the carbon dot formation, white-light emission with a CIE index of (0.29, 0.34) has been achieved from the single source with CDs-NaCl crystals upon excitation at 430 nm. The crystals also function as Fabry-Perot (F-P) mode resonator for lasing, with a laser threshold value of 0.9 mW and a resonating Q-factor of 207. These results outline a new approach for realizing F-P lasing and white light emission from a non-toxic green source with a quick, facile and low-cost synthesis procedure.

Automated summary

Phosphor materials with broad spectral range and an average emission lifetime have been achieved from carbon dots-NaCl crystals, with fructose as the precursor showing the most intense emission. Utilizing ripe banana peel as the precursor, white-light emission with specific CIE index has been achieved from the single source of CDs-NaCl crystals, which also function as Fabry-Perot resonators for lasing with low laser threshold value and high Q-factor. This approach offers a new method for F-P lasing and white light emission from a non-toxic green source with a quick and low-cost synthesis procedure.