White light emitting diode and anti-counterfeiting applications of microwave assisted synthesized green fluorescent carbon dots derived from waste curry leaves
Muniyandi Maruthupandi, Pandiaraja Varatharajan, I. B. Shameem Banu, Mohamad Hafiz Mamat, N. Vasimalai
Abstract
We have prepared waste curry leaves extract derived carbon dots (CL-C dots) by microwave assisted method. The synthesized CL-C dots were well characterized by many techniques. Using HR-TEM images, the size of the synthesized CL-C dots were determined to be 3.55 nm. CL-C dots exhibits green fluorescence and obtained emission maximum at 425 nm upon the excitation at 340 nm. The green emissive CL-C dots quantum yield (QY) was determined to be 27.13%. The intensity ratio of ID/IG was, as calculated as 1.1 from the Raman spectrum. Moreover, CL-C dots were successfully applied for the preparation of the White Light Emitting Diode (WLED) device. The developed WLED has a colour coordinate value of (0.307, 0.354) and a colour correlated temperature of 6617 K. Finally, we have been used CL-C dots for anti-counterfeiting fluorescent ink application, it is a low-cost, simple-to-use substance that will eventually replace commercially available fluorescent inks. This research work offers a vision in the fields of materials science, WLED, energy, anti-counterfeiting and forensic science.