Synthesis of fluorescent composite films PVA/CDots from orange concentrate with microwave technique

Carbon dots (CDots) is one of the fluorescent materials that can be made of organic materials. CDots materials can be obtained easily using organic materials that have carbon chain. Synthesis of CDots with orange concentrate as a PVA/CDots composite film using microwave was carried out and the optical properties of synthesized CDots with various concentrations of orange concentrate were observed using excitation wavelength variations by observing emissions of CDots. The successful synthesis of CDots could be recognized by simply irradiating a 405 nm UV laser into a sample and then further characterization using a UV-Vis spectrophotometer and photoluminescence were conducted. The results of UV-Vis characterization showed the effect of concentration variation on the the absorbance peak wavelength. For high concentration, the absorbance peak wavelength is longer than that of low concentration. This is due to the surface state CDots. The characterization of photoluminescence shows CDots emissions. Excitation using a blue laser (1=420 run) produces emission peaks that is in the range of green wavelengths, whereas excitation using green laser (1=532 nm) produces emission peaks that are in the range of yellow-red wavelengths. The results of the synthesized PVA/CDots films from orange concentrates have good potential to be applied as glowing packaging. (paper)