Fig. 3: Mechanistic investigation.
From: Photoactivated room temperature phosphorescence from lignin
a Phosphorescence spectra of PLA-Lig in air (red line) and Ar (black line) without UV activation. b Phosphorescence lifetime of PLA-Lig in air and Ar without UV activation. c EPR spectra of PLA-Lig in the presence of TEMP in the dark (black line) and upon UV irradiation (red line). d Simulated results of conformation in PLA/Lig. e Simulated results of conformation in PLA-Lig. f The distance between adjacent aromatic units in PLA/Lig (red line) and PLA-Lig (black line). (Conditions of all phosphorescence measurements in Fig. 3: Excitation wavelength = 310 nm, delay time = 10 ms, temperature = 20 °C). All the lignin concentrations in the PLA-Lig were 0.1%.
