Fig. 2: Photophysical properties and theoretical calculation of perylene derivatives.

a Normalized UV-vis absorption (abs) and fluorescence emission (em) spectra of Py1-Py4 in toluene. b The optimized ground state conformations of Py1 and Py3 via DFT//B3LYP/6-31 G; c Electron density maps of the frontier molecular orbitals of Py1 and Py3; d Spin density surfaces of Py1 and Py3 in toluene at the optimized triplet state geometries.