Abstract
Optical properties of carbon dots (CDs), prepared using 10-Undeceonic acid as an organic precursor, exhibited broad range excitation wavelength-dependent photoluminescence, with maximum emission intensity at 3.5 eV. Besides conventional down-conversion PL (DCPL), CDs show excitation wavelength-dependent upconversion PL(UCPL), produced by electromagnetic radiation in the green-NIR wavelength range. The difference between the excitation energy and the UCPL peak energy is found to be constant upon varying the excitation energy, whereas the energy difference with respect to DCPL peak energy decreases linearly. UCPL/DCPL have been explained with the help of surface states, shallow and deep trap states present in the proposed CDs.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
