Carbon dots with efficient UV emission, derived from renewable and abundant green tea extract

https://www.eurekalert.org/news-releases/1085699

"no: cadmium/ lead, critical raw materials, petroleum-based chemicals, complex/ expensive processes... simply hydrothermally fabricated, exhibiting 384 nm photoluminescence peak, 17% quantum yield in water (emission nearly 5X stronger/ becomes blue-shifted, when dissolved in poor solvents)... as solvent polarity index increases, quantum yield decreases, with highest yield of 81% using highly hydrophobic solvent 3-phenoxyanisole... sterilization, anti-counterfeiting, phototherapy, forensic analysis, communication"