Fig. 9: Second linear response TDDFT calculations.
From: Two-photon excited deep-red and near-infrared emissive organic co-crystals

The simulated two-photon excited spectra of a NDI-Δ, b COR, c CNC-T and d CNC-Q. The inset in c displays a magnified simulated two-photon excited spectrum of CNC-T in the region of 1000–1300 nm.